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authorMichel Lespinasse <walken@google.com>2020-06-08 21:33:54 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-09 09:39:14 -0700
commitc1e8d7c6a7a682e1405e3e242d32fc377fd196ff (patch)
treeef02402b77990834fbb5bdb1f146fc0393cc8987 /mm
parent3e4e28c5a8f01ee4174d639e36ed155ade489a6f (diff)
mmap locking API: convert mmap_sem comments
Convert comments that reference mmap_sem to reference mmap_lock instead. [akpm@linux-foundation.org: fix up linux-next leftovers] [akpm@linux-foundation.org: s/lockaphore/lock/, per Vlastimil] [akpm@linux-foundation.org: more linux-next fixups, per Michel] Signed-off-by: Michel Lespinasse <walken@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Daniel Jordan <daniel.m.jordan@oracle.com> Cc: Davidlohr Bueso <dbueso@suse.de> Cc: David Rientjes <rientjes@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@ziepe.ca> Cc: Jerome Glisse <jglisse@redhat.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Laurent Dufour <ldufour@linux.ibm.com> Cc: Liam Howlett <Liam.Howlett@oracle.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Ying Han <yinghan@google.com> Link: http://lkml.kernel.org/r/20200520052908.204642-13-walken@google.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/filemap.c38
-rw-r--r--mm/frame_vector.c2
-rw-r--r--mm/gup.c38
-rw-r--r--mm/huge_memory.c4
-rw-r--r--mm/hugetlb.c2
-rw-r--r--mm/internal.h4
-rw-r--r--mm/khugepaged.c34
-rw-r--r--mm/ksm.c12
-rw-r--r--mm/maccess.c4
-rw-r--r--mm/madvise.c20
-rw-r--r--mm/memcontrol.c2
-rw-r--r--mm/memory.c40
-rw-r--r--mm/mempolicy.c12
-rw-r--r--mm/migrate.c4
-rw-r--r--mm/mlock.c6
-rw-r--r--mm/mmap.c36
-rw-r--r--mm/mmu_gather.c2
-rw-r--r--mm/mmu_notifier.c10
-rw-r--r--mm/mprotect.c8
-rw-r--r--mm/mremap.c8
-rw-r--r--mm/nommu.c6
-rw-r--r--mm/oom_kill.c2
-rw-r--r--mm/pagewalk.c6
-rw-r--r--mm/rmap.c12
-rw-r--r--mm/shmem.c4
-rw-r--r--mm/swap_state.c4
-rw-r--r--mm/userfaultfd.c8
-rw-r--r--mm/util.c2
28 files changed, 165 insertions, 165 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 950cf12a10fc..f0ae9a6308cb 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -76,16 +76,16 @@
* ->i_mutex
* ->i_mmap_rwsem (truncate->unmap_mapping_range)
*
- * ->mmap_sem
+ * ->mmap_lock
* ->i_mmap_rwsem
* ->page_table_lock or pte_lock (various, mainly in memory.c)
* ->i_pages lock (arch-dependent flush_dcache_mmap_lock)
*
- * ->mmap_sem
+ * ->mmap_lock
* ->lock_page (access_process_vm)
*
* ->i_mutex (generic_perform_write)
- * ->mmap_sem (fault_in_pages_readable->do_page_fault)
+ * ->mmap_lock (fault_in_pages_readable->do_page_fault)
*
* bdi->wb.list_lock
* sb_lock (fs/fs-writeback.c)
@@ -1371,21 +1371,21 @@ EXPORT_SYMBOL_GPL(__lock_page_killable);
/*
* Return values:
- * 1 - page is locked; mmap_sem is still held.
+ * 1 - page is locked; mmap_lock is still held.
* 0 - page is not locked.
* mmap_lock has been released (mmap_read_unlock(), unless flags had both
* FAULT_FLAG_ALLOW_RETRY and FAULT_FLAG_RETRY_NOWAIT set, in
- * which case mmap_sem is still held.
+ * which case mmap_lock is still held.
*
* If neither ALLOW_RETRY nor KILLABLE are set, will always return 1
- * with the page locked and the mmap_sem unperturbed.
+ * with the page locked and the mmap_lock unperturbed.
*/
int __lock_page_or_retry(struct page *page, struct mm_struct *mm,
unsigned int flags)
{
if (fault_flag_allow_retry_first(flags)) {
/*
- * CAUTION! In this case, mmap_sem is not released
+ * CAUTION! In this case, mmap_lock is not released
* even though return 0.
*/
if (flags & FAULT_FLAG_RETRY_NOWAIT)
@@ -2313,14 +2313,14 @@ EXPORT_SYMBOL(generic_file_read_iter);
#ifdef CONFIG_MMU
#define MMAP_LOTSAMISS (100)
/*
- * lock_page_maybe_drop_mmap - lock the page, possibly dropping the mmap_sem
+ * lock_page_maybe_drop_mmap - lock the page, possibly dropping the mmap_lock
* @vmf - the vm_fault for this fault.
* @page - the page to lock.
* @fpin - the pointer to the file we may pin (or is already pinned).
*
- * This works similar to lock_page_or_retry in that it can drop the mmap_sem.
+ * This works similar to lock_page_or_retry in that it can drop the mmap_lock.
* It differs in that it actually returns the page locked if it returns 1 and 0
- * if it couldn't lock the page. If we did have to drop the mmap_sem then fpin
+ * if it couldn't lock the page. If we did have to drop the mmap_lock then fpin
* will point to the pinned file and needs to be fput()'ed at a later point.
*/
static int lock_page_maybe_drop_mmap(struct vm_fault *vmf, struct page *page,
@@ -2331,7 +2331,7 @@ static int lock_page_maybe_drop_mmap(struct vm_fault *vmf, struct page *page,
/*
* NOTE! This will make us return with VM_FAULT_RETRY, but with
- * the mmap_sem still held. That's how FAULT_FLAG_RETRY_NOWAIT
+ * the mmap_lock still held. That's how FAULT_FLAG_RETRY_NOWAIT
* is supposed to work. We have way too many special cases..
*/
if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT)
@@ -2341,10 +2341,10 @@ static int lock_page_maybe_drop_mmap(struct vm_fault *vmf, struct page *page,
if (vmf->flags & FAULT_FLAG_KILLABLE) {
if (__lock_page_killable(page)) {
/*
- * We didn't have the right flags to drop the mmap_sem,
+ * We didn't have the right flags to drop the mmap_lock,
* but all fault_handlers only check for fatal signals
* if we return VM_FAULT_RETRY, so we need to drop the
- * mmap_sem here and return 0 if we don't have a fpin.
+ * mmap_lock here and return 0 if we don't have a fpin.
*/
if (*fpin == NULL)
mmap_read_unlock(vmf->vma->vm_mm);
@@ -2409,7 +2409,7 @@ static struct file *do_sync_mmap_readahead(struct vm_fault *vmf)
/*
* Asynchronous readahead happens when we find the page and PG_readahead,
* so we want to possibly extend the readahead further. We return the file that
- * was pinned if we have to drop the mmap_sem in order to do IO.
+ * was pinned if we have to drop the mmap_lock in order to do IO.
*/
static struct file *do_async_mmap_readahead(struct vm_fault *vmf,
struct page *page)
@@ -2444,12 +2444,12 @@ static struct file *do_async_mmap_readahead(struct vm_fault *vmf,
* it in the page cache, and handles the special cases reasonably without
* having a lot of duplicated code.
*
- * vma->vm_mm->mmap_sem must be held on entry.
+ * vma->vm_mm->mmap_lock must be held on entry.
*
- * If our return value has VM_FAULT_RETRY set, it's because the mmap_sem
+ * If our return value has VM_FAULT_RETRY set, it's because the mmap_lock
* may be dropped before doing I/O or by lock_page_maybe_drop_mmap().
*
- * If our return value does not have VM_FAULT_RETRY set, the mmap_sem
+ * If our return value does not have VM_FAULT_RETRY set, the mmap_lock
* has not been released.
*
* We never return with VM_FAULT_RETRY and a bit from VM_FAULT_ERROR set.
@@ -2519,7 +2519,7 @@ retry_find:
goto page_not_uptodate;
/*
- * We've made it this far and we had to drop our mmap_sem, now is the
+ * We've made it this far and we had to drop our mmap_lock, now is the
* time to return to the upper layer and have it re-find the vma and
* redo the fault.
*/
@@ -2569,7 +2569,7 @@ page_not_uptodate:
out_retry:
/*
- * We dropped the mmap_sem, we need to return to the fault handler to
+ * We dropped the mmap_lock, we need to return to the fault handler to
* re-find the vma and come back and find our hopefully still populated
* page.
*/
diff --git a/mm/frame_vector.c b/mm/frame_vector.c
index c2578e1a2bb7..10f82d5643b6 100644
--- a/mm/frame_vector.c
+++ b/mm/frame_vector.c
@@ -29,7 +29,7 @@
* different type underlying the specified range of virtual addresses.
* When the function isn't able to map a single page, it returns error.
*
- * This function takes care of grabbing mmap_sem as necessary.
+ * This function takes care of grabbing mmap_lock as necessary.
*/
int get_vaddr_frames(unsigned long start, unsigned int nr_frames,
unsigned int gup_flags, struct frame_vector *vec)
diff --git a/mm/gup.c b/mm/gup.c
index bbb8851f4656..de9e36262ccb 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -592,7 +592,7 @@ retry:
pmdval = READ_ONCE(*pmd);
/*
* MADV_DONTNEED may convert the pmd to null because
- * mmap_sem is held in read mode
+ * mmap_lock is held in read mode
*/
if (pmd_none(pmdval))
return no_page_table(vma, flags);
@@ -855,8 +855,8 @@ unmap:
}
/*
- * mmap_sem must be held on entry. If @locked != NULL and *@flags
- * does not include FOLL_NOWAIT, the mmap_sem may be released. If it
+ * mmap_lock must be held on entry. If @locked != NULL and *@flags
+ * does not include FOLL_NOWAIT, the mmap_lock may be released. If it
* is, *@locked will be set to 0 and -EBUSY returned.
*/
static int faultin_page(struct task_struct *tsk, struct vm_area_struct *vma,
@@ -979,7 +979,7 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
* only intends to ensure the pages are faulted in.
* @vmas: array of pointers to vmas corresponding to each page.
* Or NULL if the caller does not require them.
- * @locked: whether we're still with the mmap_sem held
+ * @locked: whether we're still with the mmap_lock held
*
* Returns either number of pages pinned (which may be less than the
* number requested), or an error. Details about the return value:
@@ -992,9 +992,9 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
*
* The caller is responsible for releasing returned @pages, via put_page().
*
- * @vmas are valid only as long as mmap_sem is held.
+ * @vmas are valid only as long as mmap_lock is held.
*
- * Must be called with mmap_sem held. It may be released. See below.
+ * Must be called with mmap_lock held. It may be released. See below.
*
* __get_user_pages walks a process's page tables and takes a reference to
* each struct page that each user address corresponds to at a given
@@ -1015,12 +1015,12 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
* appropriate) must be called after the page is finished with, and
* before put_page is called.
*
- * If @locked != NULL, *@locked will be set to 0 when mmap_sem is
+ * If @locked != NULL, *@locked will be set to 0 when mmap_lock is
* released by an up_read(). That can happen if @gup_flags does not
* have FOLL_NOWAIT.
*
* A caller using such a combination of @locked and @gup_flags
- * must therefore hold the mmap_sem for reading only, and recognize
+ * must therefore hold the mmap_lock for reading only, and recognize
* when it's been released. Otherwise, it must be held for either
* reading or writing and will not be released.
*
@@ -1083,7 +1083,7 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
if (locked && *locked == 0) {
/*
* We've got a VM_FAULT_RETRY
- * and we've lost mmap_sem.
+ * and we've lost mmap_lock.
* We must stop here.
*/
BUG_ON(gup_flags & FOLL_NOWAIT);
@@ -1190,7 +1190,7 @@ static bool vma_permits_fault(struct vm_area_struct *vma,
* @mm: mm_struct of target mm
* @address: user address
* @fault_flags:flags to pass down to handle_mm_fault()
- * @unlocked: did we unlock the mmap_sem while retrying, maybe NULL if caller
+ * @unlocked: did we unlock the mmap_lock while retrying, maybe NULL if caller
* does not allow retry. If NULL, the caller must guarantee
* that fault_flags does not contain FAULT_FLAG_ALLOW_RETRY.
*
@@ -1211,8 +1211,8 @@ static bool vma_permits_fault(struct vm_area_struct *vma,
* such architectures, gup() will not be enough to make a subsequent access
* succeed.
*
- * This function will not return with an unlocked mmap_sem. So it has not the
- * same semantics wrt the @mm->mmap_sem as does filemap_fault().
+ * This function will not return with an unlocked mmap_lock. So it has not the
+ * same semantics wrt the @mm->mmap_lock as does filemap_fault().
*/
int fixup_user_fault(struct task_struct *tsk, struct mm_struct *mm,
unsigned long address, unsigned int fault_flags,
@@ -1400,13 +1400,13 @@ retry:
* @vma: target vma
* @start: start address
* @end: end address
- * @locked: whether the mmap_sem is still held
+ * @locked: whether the mmap_lock is still held
*
* This takes care of mlocking the pages too if VM_LOCKED is set.
*
* return 0 on success, negative error code on error.
*
- * vma->vm_mm->mmap_sem must be held.
+ * vma->vm_mm->mmap_lock must be held.
*
* If @locked is NULL, it may be held for read or write and will
* be unperturbed.
@@ -1458,7 +1458,7 @@ long populate_vma_page_range(struct vm_area_struct *vma,
*
* This is used to implement mlock() and the MAP_POPULATE / MAP_LOCKED mmap
* flags. VMAs must be already marked with the desired vm_flags, and
- * mmap_sem must not be held.
+ * mmap_lock must not be held.
*/
int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
{
@@ -1525,7 +1525,7 @@ int __mm_populate(unsigned long start, unsigned long len, int ignore_errors)
* NULL wherever the ZERO_PAGE, or an anonymous pte_none, has been found -
* allowing a hole to be left in the corefile to save diskspace.
*
- * Called without mmap_sem, but after all other threads have been killed.
+ * Called without mmap_lock, but after all other threads have been killed.
*/
#ifdef CONFIG_ELF_CORE
struct page *get_dump_page(unsigned long addr)
@@ -1886,9 +1886,9 @@ static long __get_user_pages_remote(struct task_struct *tsk,
*
* The caller is responsible for releasing returned @pages, via put_page().
*
- * @vmas are valid only as long as mmap_sem is held.
+ * @vmas are valid only as long as mmap_lock is held.
*
- * Must be called with mmap_sem held for read or write.
+ * Must be called with mmap_lock held for read or write.
*
* get_user_pages_remote walks a process's page tables and takes a reference
* to each struct page that each user address corresponds to at a given
@@ -2873,7 +2873,7 @@ EXPORT_SYMBOL_GPL(get_user_pages_fast_only);
* @pages: array that receives pointers to the pages pinned.
* Should be at least nr_pages long.
*
- * Attempt to pin user pages in memory without taking mm->mmap_sem.
+ * Attempt to pin user pages in memory without taking mm->mmap_lock.
* If not successful, it will fall back to taking the lock and
* calling get_user_pages().
*
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index de201f0b5a4a..78c84bee7e29 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1746,7 +1746,7 @@ bool move_huge_pmd(struct vm_area_struct *vma, unsigned long old_addr,
/*
* We don't have to worry about the ordering of src and dst
- * ptlocks because exclusive mmap_sem prevents deadlock.
+ * ptlocks because exclusive mmap_lock prevents deadlock.
*/
old_ptl = __pmd_trans_huge_lock(old_pmd, vma);
if (old_ptl) {
@@ -2618,7 +2618,7 @@ int split_huge_page_to_list(struct page *page, struct list_head *list)
if (PageAnon(head)) {
/*
- * The caller does not necessarily hold an mmap_sem that would
+ * The caller does not necessarily hold an mmap_lock that would
* prevent the anon_vma disappearing so we first we take a
* reference to it and then lock the anon_vma for write. This
* is similar to page_lock_anon_vma_read except the write lock
diff --git a/mm/hugetlb.c b/mm/hugetlb.c
index f102eb82f81d..57ece74e3aae 100644
--- a/mm/hugetlb.c
+++ b/mm/hugetlb.c
@@ -4695,7 +4695,7 @@ int hugetlb_mcopy_atomic_pte(struct mm_struct *dst_mm,
(const void __user *) src_addr,
pages_per_huge_page(h), false);
- /* fallback to copy_from_user outside mmap_sem */
+ /* fallback to copy_from_user outside mmap_lock */
if (unlikely(ret)) {
ret = -ENOENT;
*pagep = page;
diff --git a/mm/internal.h b/mm/internal.h
index 3d3eb867030a..9886db20d94f 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -344,7 +344,7 @@ static inline void munlock_vma_pages_all(struct vm_area_struct *vma)
}
/*
- * must be called with vma's mmap_sem held for read or write, and page locked.
+ * must be called with vma's mmap_lock held for read or write, and page locked.
*/
extern void mlock_vma_page(struct page *page);
extern unsigned int munlock_vma_page(struct page *page);
@@ -413,7 +413,7 @@ static inline struct file *maybe_unlock_mmap_for_io(struct vm_fault *vmf,
/*
* FAULT_FLAG_RETRY_NOWAIT means we don't want to wait on page locks or
- * anything, so we only pin the file and drop the mmap_sem if only
+ * anything, so we only pin the file and drop the mmap_lock if only
* FAULT_FLAG_ALLOW_RETRY is set, while this is the first attempt.
*/
if (fault_flag_allow_retry_first(flags) &&
diff --git a/mm/khugepaged.c b/mm/khugepaged.c
index 2c318ad1db20..b043c40a21d4 100644
--- a/mm/khugepaged.c
+++ b/mm/khugepaged.c
@@ -534,7 +534,7 @@ void __khugepaged_exit(struct mm_struct *mm)
* under mmap sem read mode). Stop here (after we
* return all pagetables will be destroyed) until
* khugepaged has finished working on the pagetables
- * under the mmap_sem.
+ * under the mmap_lock.
*/
mmap_write_lock(mm);
mmap_write_unlock(mm);
@@ -933,8 +933,8 @@ khugepaged_alloc_page(struct page **hpage, gfp_t gfp, int node)
#endif
/*
- * If mmap_sem temporarily dropped, revalidate vma
- * before taking mmap_sem.
+ * If mmap_lock temporarily dropped, revalidate vma
+ * before taking mmap_lock.
* Return 0 if succeeds, otherwise return none-zero
* value (scan code).
*/
@@ -966,7 +966,7 @@ static int hugepage_vma_revalidate(struct mm_struct *mm, unsigned long address,
* Only done if khugepaged_scan_pmd believes it is worthwhile.
*
* Called and returns without pte mapped or spinlocks held,
- * but with mmap_sem held to protect against vma changes.
+ * but with mmap_lock held to protect against vma changes.
*/
static bool __collapse_huge_page_swapin(struct mm_struct *mm,
@@ -993,7 +993,7 @@ static bool __collapse_huge_page_swapin(struct mm_struct *mm,
swapped_in++;
ret = do_swap_page(&vmf);
- /* do_swap_page returns VM_FAULT_RETRY with released mmap_sem */
+ /* do_swap_page returns VM_FAULT_RETRY with released mmap_lock */
if (ret & VM_FAULT_RETRY) {
mmap_read_lock(mm);
if (hugepage_vma_revalidate(mm, address, &vmf.vma)) {
@@ -1047,9 +1047,9 @@ static void collapse_huge_page(struct mm_struct *mm,
gfp = alloc_hugepage_khugepaged_gfpmask() | __GFP_THISNODE;
/*
- * Before allocating the hugepage, release the mmap_sem read lock.
+ * Before allocating the hugepage, release the mmap_lock read lock.
* The allocation can take potentially a long time if it involves
- * sync compaction, and we do not need to hold the mmap_sem during
+ * sync compaction, and we do not need to hold the mmap_lock during
* that. We will recheck the vma after taking it again in write mode.
*/
mmap_read_unlock(mm);
@@ -1080,8 +1080,8 @@ static void collapse_huge_page(struct mm_struct *mm,
}
/*
- * __collapse_huge_page_swapin always returns with mmap_sem locked.
- * If it fails, we release mmap_sem and jump out_nolock.
+ * __collapse_huge_page_swapin always returns with mmap_lock locked.
+ * If it fails, we release mmap_lock and jump out_nolock.
* Continuing to collapse causes inconsistency.
*/
if (unmapped && !__collapse_huge_page_swapin(mm, vma, address,
@@ -1345,7 +1345,7 @@ out_unmap:
pte_unmap_unlock(pte, ptl);
if (ret) {
node = khugepaged_find_target_node();
- /* collapse_huge_page will return with the mmap_sem released */
+ /* collapse_huge_page will return with the mmap_lock released */
collapse_huge_page(mm, address, hpage, node,
referenced, unmapped);
}
@@ -1547,7 +1547,7 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
* later.
*
* Not that vma->anon_vma check is racy: it can be set up after
- * the check but before we took mmap_sem by the fault path.
+ * the check but before we took mmap_lock by the fault path.
* But page lock would prevent establishing any new ptes of the
* page, so we are safe.
*
@@ -1567,10 +1567,10 @@ static void retract_page_tables(struct address_space *mapping, pgoff_t pgoff)
if (!pmd)
continue;
/*
- * We need exclusive mmap_sem to retract page table.
+ * We need exclusive mmap_lock to retract page table.
*
* We use trylock due to lock inversion: we need to acquire
- * mmap_sem while holding page lock. Fault path does it in
+ * mmap_lock while holding page lock. Fault path does it in
* reverse order. Trylock is a way to avoid deadlock.
*/
if (mmap_write_trylock(vma->vm_mm)) {
@@ -2058,7 +2058,7 @@ static unsigned int khugepaged_scan_mm_slot(unsigned int pages,
*/
vma = NULL;
if (unlikely(!mmap_read_trylock(mm)))
- goto breakouterloop_mmap_sem;
+ goto breakouterloop_mmap_lock;
if (likely(!khugepaged_test_exit(mm)))
vma = find_vma(mm, khugepaged_scan.address);
@@ -2115,15 +2115,15 @@ skip:
khugepaged_scan.address += HPAGE_PMD_SIZE;
progress += HPAGE_PMD_NR;
if (ret)
- /* we released mmap_sem so break loop */
- goto breakouterloop_mmap_sem;
+ /* we released mmap_lock so break loop */
+ goto breakouterloop_mmap_lock;
if (progress >= pages)
goto breakouterloop;
}
}
breakouterloop:
mmap_read_unlock(mm); /* exit_mmap will destroy ptes after this */
-breakouterloop_mmap_sem:
+breakouterloop_mmap_lock:
spin_lock(&khugepaged_mm_lock);
VM_BUG_ON(khugepaged_scan.mm_slot != mm_slot);
diff --git a/mm/ksm.c b/mm/ksm.c
index 3efe7f28cc3f..4102034cd55a 100644
--- a/mm/ksm.c
+++ b/mm/ksm.c
@@ -442,7 +442,7 @@ static void insert_to_mm_slots_hash(struct mm_struct *mm,
/*
* ksmd, and unmerge_and_remove_all_rmap_items(), must not touch an mm's
* page tables after it has passed through ksm_exit() - which, if necessary,
- * takes mmap_sem briefly to serialize against them. ksm_exit() does not set
+ * takes mmap_lock briefly to serialize against them. ksm_exit() does not set
* a special flag: they can just back out as soon as mm_users goes to zero.
* ksm_test_exit() is used throughout to make this test for exit: in some
* places for correctness, in some places just to avoid unnecessary work.
@@ -831,7 +831,7 @@ static void remove_trailing_rmap_items(struct mm_slot *mm_slot,
* Though it's very tempting to unmerge rmap_items from stable tree rather
* than check every pte of a given vma, the locking doesn't quite work for
* that - an rmap_item is assigned to the stable tree after inserting ksm
- * page and upping mmap_sem. Nor does it fit with the way we skip dup'ing
+ * page and upping mmap_lock. Nor does it fit with the way we skip dup'ing
* rmap_items from parent to child at fork time (so as not to waste time
* if exit comes before the next scan reaches it).
*
@@ -1292,7 +1292,7 @@ static int try_to_merge_with_ksm_page(struct rmap_item *rmap_item,
/* Unstable nid is in union with stable anon_vma: remove first */
remove_rmap_item_from_tree(rmap_item);
- /* Must get reference to anon_vma while still holding mmap_sem */
+ /* Must get reference to anon_vma while still holding mmap_lock */
rmap_item->anon_vma = vma->anon_vma;
get_anon_vma(vma->anon_vma);
out:
@@ -2343,13 +2343,13 @@ next_mm:
struct mm_slot, mm_list);
if (ksm_scan.address == 0) {
/*
- * We've completed a full scan of all vmas, holding mmap_sem
+ * We've completed a full scan of all vmas, holding mmap_lock
* throughout, and found no VM_MERGEABLE: so do the same as
* __ksm_exit does to remove this mm from all our lists now.
* This applies either when cleaning up after __ksm_exit
* (but beware: we can reach here even before __ksm_exit),
* or when all VM_MERGEABLE areas have been unmapped (and
- * mmap_sem then protects against race with MADV_MERGEABLE).
+ * mmap_lock then protects against race with MADV_MERGEABLE).
*/
hash_del(&slot->link);
list_del(&slot->mm_list);
@@ -2536,7 +2536,7 @@ void __ksm_exit(struct mm_struct *mm)
* This process is exiting: if it's straightforward (as is the
* case when ksmd was never running), free mm_slot immediately.
* But if it's at the cursor or has rmap_items linked to it, use
- * mmap_sem to synchronize with any break_cows before pagetables
+ * mmap_lock to synchronize with any break_cows before pagetables
* are freed, and leave the mm_slot on the list for ksmd to free.
* Beware: ksm may already have noticed it exiting and freed the slot.
*/
diff --git a/mm/maccess.c b/mm/maccess.c
index 3ca8d97e5010..81df3b788284 100644
--- a/mm/maccess.c
+++ b/mm/maccess.c
@@ -40,9 +40,9 @@ probe_write_common(void __user *dst, const void *src, size_t size)
* happens, handle that and return -EFAULT.
*
* We ensure that the copy_from_user is executed in atomic context so that
- * do_page_fault() doesn't attempt to take mmap_sem. This makes
+ * do_page_fault() doesn't attempt to take mmap_lock. This makes
* probe_kernel_read() suitable for use within regions where the caller
- * already holds mmap_sem, or other locks which nest inside mmap_sem.
+ * already holds mmap_lock, or other locks which nest inside mmap_lock.
*
* probe_kernel_read_strict() is the same as probe_kernel_read() except for
* the case where architectures have non-overlapping user and kernel address
diff --git a/mm/madvise.c b/mm/madvise.c
index d9b0f66b4396..dd1d43cf026d 100644
--- a/mm/madvise.c
+++ b/mm/madvise.c
@@ -40,7 +40,7 @@ struct madvise_walk_private {
/*
* Any behaviour which results in changes to the vma->vm_flags needs to
- * take mmap_sem for writing. Others, which simply traverse vmas, need
+ * take mmap_lock for writing. Others, which simply traverse vmas, need
* to only take it for reading.
*/
static int madvise_need_mmap_write(int behavior)
@@ -165,7 +165,7 @@ static long madvise_behavior(struct vm_area_struct *vma,
success:
/*
- * vm_flags is protected by the mmap_sem held in write mode.
+ * vm_flags is protected by the mmap_lock held in write mode.
*/
vma->vm_flags = new_flags;
@@ -285,9 +285,9 @@ static long madvise_willneed(struct vm_area_struct *vma,
* Filesystem's fadvise may need to take various locks. We need to
* explicitly grab a reference because the vma (and hence the
* vma's reference to the file) can go away as soon as we drop
- * mmap_sem.
+ * mmap_lock.
*/
- *prev = NULL; /* tell sys_madvise we drop mmap_sem */
+ *prev = NULL; /* tell sys_madvise we drop mmap_lock */
get_file(file);
mmap_read_unlock(current->mm);
offset = (loff_t)(start - vma->vm_start)
@@ -768,7 +768,7 @@ static long madvise_dontneed_free(struct vm_area_struct *vma,
return -EINVAL;
if (!userfaultfd_remove(vma, start, end)) {
- *prev = NULL; /* mmap_sem has been dropped, prev is stale */
+ *prev = NULL; /* mmap_lock has been dropped, prev is stale */
mmap_read_lock(current->mm);
vma = find_vma(current->mm, start);
@@ -791,7 +791,7 @@ static long madvise_dontneed_free(struct vm_area_struct *vma,
if (end > vma->vm_end) {
/*
* Don't fail if end > vma->vm_end. If the old
- * vma was splitted while the mmap_sem was
+ * vma was splitted while the mmap_lock was
* released the effect of the concurrent
* operation may not cause madvise() to
* have an undefined result. There may be an
@@ -826,7 +826,7 @@ static long madvise_remove(struct vm_area_struct *vma,
int error;
struct file *f;
- *prev = NULL; /* tell sys_madvise we drop mmap_sem */
+ *prev = NULL; /* tell sys_madvise we drop mmap_lock */
if (vma->vm_flags & VM_LOCKED)
return -EINVAL;
@@ -847,11 +847,11 @@ static long madvise_remove(struct vm_area_struct *vma,
* Filesystem's fallocate may need to take i_mutex. We need to
* explicitly grab a reference because the vma (and hence the
* vma's reference to the file) can go away as soon as we drop
- * mmap_sem.
+ * mmap_lock.
*/
get_file(f);
if (userfaultfd_remove(vma, start, end)) {
- /* mmap_sem was not released by userfaultfd_remove() */
+ /* mmap_lock was not released by userfaultfd_remove() */
mmap_read_unlock(current->mm);
}
error = vfs_fallocate(f,
@@ -1153,7 +1153,7 @@ int do_madvise(unsigned long start, size_t len_in, int behavior)
goto out;
if (prev)
vma = prev->vm_next;
- else /* madvise_remove dropped mmap_sem */
+ else /* madvise_remove dropped mmap_lock */
vma = find_vma(current->mm, start);
}
out:
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index ffae92d4e472..0b38b6ad547d 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -5901,7 +5901,7 @@ static void mem_cgroup_move_charge(void)
retry:
if (unlikely(!mmap_read_trylock(mc.mm))) {
/*
- * Someone who are holding the mmap_sem might be waiting in
+ * Someone who are holding the mmap_lock might be waiting in
* waitq. So we cancel all extra charges, wake up all waiters,
* and retry. Because we cancel precharges, we might not be able
* to move enough charges, but moving charge is a best-effort
diff --git a/mm/memory.c b/mm/memory.c
index 4e2e17bb1281..dc7f3543b1fd 100644
--- a/mm/memory.c
+++ b/mm/memory.c
@@ -1185,7 +1185,7 @@ static inline unsigned long zap_pmd_range(struct mmu_gather *tlb,
* Here there can be other concurrent MADV_DONTNEED or
* trans huge page faults running, and if the pmd is
* none or trans huge it can change under us. This is
- * because MADV_DONTNEED holds the mmap_sem in read
+ * because MADV_DONTNEED holds the mmap_lock in read
* mode.
*/
if (pmd_none_or_trans_huge_or_clear_bad(pmd))
@@ -1636,7 +1636,7 @@ EXPORT_SYMBOL(vm_insert_pages);
* The page does not need to be reserved.
*
* Usually this function is called from f_op->mmap() handler
- * under mm->mmap_sem write-lock, so it can change vma->vm_flags.
+ * under mm->mmap_lock write-lock, so it can change vma->vm_flags.
* Caller must set VM_MIXEDMAP on vma if it wants to call this
* function from other places, for example from page-fault handler.
*
@@ -2573,7 +2573,7 @@ static vm_fault_t fault_dirty_shared_page(struct vm_fault *vmf)
* mapping may be NULL here because some device drivers do not
* set page.mapping but still dirty their pages
*
- * Drop the mmap_sem before waiting on IO, if we can. The file
+ * Drop the mmap_lock before waiting on IO, if we can. The file
* is pinning the mapping, as per above.
*/
if ((dirtied || page_mkwrite) && mapping) {
@@ -2623,7 +2623,7 @@ static inline void wp_page_reuse(struct vm_fault *vmf)
/*
* Handle the case of a page which we actually need to copy to a new page.
*
- * Called with mmap_sem locked and the old page referenced, but
+ * Called with mmap_lock locked and the old page referenced, but
* without the ptl held.
*
* High level logic flow:
@@ -2887,9 +2887,9 @@ static vm_fault_t wp_page_shared(struct vm_fault *vmf)
* change only once the write actually happens. This avoids a few races,
* and potentially makes it more efficient.
*
- * We enter with non-exclusive mmap_sem (to exclude vma changes,
+ * We enter with non-exclusive mmap_lock (to exclude vma changes,
* but allow concurrent faults), with pte both mapped and locked.
- * We return with mmap_sem still held, but pte unmapped and unlocked.
+ * We return with mmap_lock still held, but pte unmapped and unlocked.
*/
static vm_fault_t do_wp_page(struct vm_fault *vmf)
__releases(vmf->ptl)
@@ -3078,11 +3078,11 @@ void unmap_mapping_range(struct address_space *mapping,
EXPORT_SYMBOL(unmap_mapping_range);
/*
- * We enter with non-exclusive mmap_sem (to exclude vma changes,
+ * We enter with non-exclusive mmap_lock (to exclude vma changes,
* but allow concurrent faults), and pte mapped but not yet locked.
* We return with pte unmapped and unlocked.
*
- * We return with the mmap_sem locked or unlocked in the same cases
+ * We return with the mmap_lock locked or unlocked in the same cases
* as does filemap_fault().
*/
vm_fault_t do_swap_page(struct vm_fault *vmf)
@@ -3303,9 +3303,9 @@ out_release:
}
/*
- * We enter with non-exclusive mmap_sem (to exclude vma changes,
+ * We enter with non-exclusive mmap_lock (to exclude vma changes,
* but allow concurrent faults), and pte mapped but not yet locked.
- * We return with mmap_sem still held, but pte unmapped and unlocked.
+ * We return with mmap_lock still held, but pte unmapped and unlocked.
*/
static vm_fault_t do_anonymous_page(struct vm_fault *vmf)
{
@@ -3419,7 +3419,7 @@ oom:
}
/*
- * The mmap_sem must have been held on entry, and may have been
+ * The mmap_lock must have been held on entry, and may have been
* released depending on flags and vma->vm_ops->fault() return value.
* See filemap_fault() and __lock_page_retry().
*/
@@ -3928,11 +3928,11 @@ static vm_fault_t do_shared_fault(struct vm_fault *vmf)
}
/*
- * We enter with non-exclusive mmap_sem (to exclude vma changes,
+ * We enter with non-exclusive mmap_lock (to exclude vma changes,
* but allow concurrent faults).
- * The mmap_sem may have been released depending on flags and our
+ * The mmap_lock may have been released depending on flags and our
* return value. See filemap_fault() and __lock_page_or_retry().
- * If mmap_sem is released, vma may become invalid (for example
+ * If mmap_lock is released, vma may become invalid (for example
* by other thread calling munmap()).
*/
static vm_fault_t do_fault(struct vm_fault *vmf)
@@ -4161,10 +4161,10 @@ static vm_fault_t wp_huge_pud(struct vm_fault *vmf, pud_t orig_pud)
* with external mmu caches can use to update those (ie the Sparc or
* PowerPC hashed page tables that act as extended TLBs).
*
- * We enter with non-exclusive mmap_sem (to exclude vma changes, but allow
+ * We enter with non-exclusive mmap_lock (to exclude vma changes, but allow
* concurrent faults).
*
- * The mmap_sem may have been released depending on flags and our return value.
+ * The mmap_lock may have been released depending on flags and our return value.
* See filemap_fault() and __lock_page_or_retry().
*/
static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
@@ -4186,7 +4186,7 @@ static vm_fault_t handle_pte_fault(struct vm_fault *vmf)
/*
* A regular pmd is established and it can't morph into a huge
* pmd from under us anymore at this point because we hold the
- * mmap_sem read mode and khugepaged takes it in write mode.
+ * mmap_lock read mode and khugepaged takes it in write mode.
* So now it's safe to run pte_offset_map().
*/
vmf->pte = pte_offset_map(vmf->pmd, vmf->address);
@@ -4254,7 +4254,7 @@ unlock:
/*
* By the time we get here, we already hold the mm semaphore
*
- * The mmap_sem may have been released depending on flags and our
+ * The mmap_lock may have been released depending on flags and our
* return value. See filemap_fault() and __lock_page_or_retry().
*/
static vm_fault_t __handle_mm_fault(struct vm_area_struct *vma,
@@ -4349,7 +4349,7 @@ retry_pud:
/*
* By the time we get here, we already hold the mm semaphore
*
- * The mmap_sem may have been released depending on flags and our
+ * The mmap_lock may have been released depending on flags and our
* return value. See filemap_fault() and __lock_page_or_retry().
*/
vm_fault_t handle_mm_fault(struct vm_area_struct *vma, unsigned long address,
@@ -4793,7 +4793,7 @@ void __might_fault(const char *file, int line)
{
/*
* Some code (nfs/sunrpc) uses socket ops on kernel memory while
- * holding the mmap_sem, this is safe because kernel memory doesn't
+ * holding the mmap_lock, this is safe because kernel memory doesn't
* get paged out, therefore we'll never actually fault, and the
* below annotations will generate false positives.
*/
diff --git a/mm/mempolicy.c b/mm/mempolicy.c
index a38cd4cc3206..381320671677 100644
--- a/mm/mempolicy.c
+++ b/mm/mempolicy.c
@@ -224,7 +224,7 @@ static int mpol_new_bind(struct mempolicy *pol, const nodemask_t *nodes)
* handle an empty nodemask with MPOL_PREFERRED here.
*
* Must be called holding task's alloc_lock to protect task's mems_allowed
- * and mempolicy. May also be called holding the mmap_semaphore for write.
+ * and mempolicy. May also be called holding the mmap_lock for write.
*/
static int mpol_set_nodemask(struct mempolicy *pol,
const nodemask_t *nodes, struct nodemask_scratch *nsc)
@@ -368,7 +368,7 @@ static void mpol_rebind_preferred(struct mempolicy *pol,
/*
* mpol_rebind_policy - Migrate a policy to a different set of nodes
*
- * Per-vma policies are protected by mmap_sem. Allocations using per-task
+ * Per-vma policies are protected by mmap_lock. Allocations using per-task
* policies are protected by task->mems_allowed_seq to prevent a premature
* OOM/allocation failure due to parallel nodemask modification.
*/
@@ -398,7 +398,7 @@ void mpol_rebind_task(struct task_struct *tsk, const nodemask_t *new)
/*
* Rebind each vma in mm to new nodemask.
*
- * Call holding a reference to mm. Takes mm->mmap_sem during call.
+ * Call holding a reference to mm. Takes mm->mmap_lock during call.
*/
void mpol_rebind_mm(struct mm_struct *mm, nodemask_t *new)
@@ -764,7 +764,7 @@ queue_pages_range(struct mm_struct *mm, unsigned long start, unsigned long end,
/*
* Apply policy to a single VMA
- * This must be called with the mmap_sem held for writing.
+ * This must be called with the mmap_lock held for writing.
*/
static int vma_replace_policy(struct vm_area_struct *vma,
struct mempolicy *pol)
@@ -789,7 +789,7 @@ static int vma_replace_policy(struct vm_area_struct *vma,
}
old = vma->vm_policy;
- vma->vm_policy = new; /* protected by mmap_sem */
+ vma->vm_policy = new; /* protected by mmap_lock */
mpol_put(old);
return 0;
@@ -985,7 +985,7 @@ static long do_get_mempolicy(int *policy, nodemask_t *nmask,
if (flags & MPOL_F_ADDR) {
/*
* Take a refcount on the mpol, lookup_node()
- * wil drop the mmap_sem, so after calling
+ * wil drop the mmap_lock, so after calling
* lookup_node() only "pol" remains valid, "vma"
* is stale.
*/
diff --git a/mm/migrate.c b/mm/migrate.c
index f69b09e0829c..f37729673558 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -2120,7 +2120,7 @@ int migrate_misplaced_transhuge_page(struct mm_struct *mm,
* pmd before doing set_pmd_at(), nor to flush the TLB after
* set_pmd_at(). Clearing the pmd here would introduce a race
* condition against MADV_DONTNEED, because MADV_DONTNEED only holds the
- * mmap_sem for reading. If the pmd is set to NULL at any given time,
+ * mmap_lock for reading. If the pmd is set to NULL at any given time,
* MADV_DONTNEED won't wait on the pmd lock and it'll skip clearing this
* pmd.
*/
@@ -2675,7 +2675,7 @@ restore:
* have the MIGRATE_PFN_MIGRATE flag set for their src array entry.
*
* It is safe to update device page table after migrate_vma_pages() because
- * both destination and source page are still locked, and the mmap_sem is held
+ * both destination and source page are still locked, and the mmap_lock is held
* in read mode (hence no one can unmap the range being migrated).
*
* Once the caller is done cleaning up things and updating its page table (if it
diff --git a/mm/mlock.c b/mm/mlock.c
index c5d806917526..f8736136fad7 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -49,7 +49,7 @@ EXPORT_SYMBOL(can_do_mlock);
* When lazy mlocking via vmscan, it is important to ensure that the
* vma's VM_LOCKED status is not concurrently being modified, otherwise we
* may have mlocked a page that is being munlocked. So lazy mlock must take
- * the mmap_sem for read, and verify that the vma really is locked
+ * the mmap_lock for read, and verify that the vma really is locked
* (see mm/rmap.c).
*/
@@ -381,7 +381,7 @@ static unsigned long __munlock_pagevec_fill(struct pagevec *pvec,
/*
* Initialize pte walk starting at the already pinned page where we
* are sure that there is a pte, as it was pinned under the same
- * mmap_sem write op.
+ * mmap_lock write op.
*/
pte = get_locked_pte(vma->vm_mm, start, &ptl);
/* Make sure we do not cross the page table boundary */
@@ -565,7 +565,7 @@ success:
mm->locked_vm += nr_pages;
/*
- * vm_flags is protected by the mmap_sem held in write mode.
+ * vm_flags is protected by the mmap_lock held in write mode.
* It's okay if try_to_unmap_one unmaps a page just after we
* set VM_LOCKED, populate_vma_page_range will bring it back.
*/
diff --git a/mm/mmap.c b/mm/mmap.c
index 79005049fbfc..59a4682ebf3f 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -132,7 +132,7 @@ void vma_set_page_prot(struct vm_area_struct *vma)
vm_flags &= ~VM_SHARED;
vm_page_prot = vm_pgprot_modify(vm_page_prot, vm_flags);
}
- /* remove_protection_ptes reads vma->vm_page_prot without mmap_sem */
+ /* remove_protection_ptes reads vma->vm_page_prot without mmap_lock */
WRITE_ONCE(vma->vm_page_prot, vm_page_prot);
}
@@ -238,14 +238,14 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
/*
* Always allow shrinking brk.
- * __do_munmap() may downgrade mmap_sem to read.
+ * __do_munmap() may downgrade mmap_lock to read.
*/
if (brk <= mm->brk) {
int ret;
/*
- * mm->brk must to be protected by write mmap_sem so update it
- * before downgrading mmap_sem. When __do_munmap() fails,
+ * mm->brk must to be protected by write mmap_lock so update it
+ * before downgrading mmap_lock. When __do_munmap() fails,
* mm->brk will be restored from origbrk.
*/
mm->brk = brk;
@@ -505,7 +505,7 @@ static __always_inline void vma_rb_erase(struct vm_area_struct *vma,
* After the update, the vma will be reinserted using
* anon_vma_interval_tree_post_update_vma().
*
- * The entire update must be protected by exclusive mmap_sem and by
+ * The entire update must be protected by exclusive mmap_lock and by
* the root anon_vma's mutex.
*/
static inline void
@@ -2371,7 +2371,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
/*
* vma->vm_start/vm_end cannot change under us because the caller
- * is required to hold the mmap_sem in read mode. We need the
+ * is required to hold the mmap_lock in read mode. We need the
* anon_vma lock to serialize against concurrent expand_stacks.
*/
anon_vma_lock_write(vma->anon_vma);
@@ -2389,7 +2389,7 @@ int expand_upwards(struct vm_area_struct *vma, unsigned long address)
if (!error) {
/*
* vma_gap_update() doesn't support concurrent
- * updates, but we only hold a shared mmap_sem
+ * updates, but we only hold a shared mmap_lock
* lock here, so we need to protect against
* concurrent vma expansions.
* anon_vma_lock_write() doesn't help here, as
@@ -2451,7 +2451,7 @@ int expand_downwards(struct vm_area_struct *vma,
/*
* vma->vm_start/vm_end cannot change under us because the caller
- * is required to hold the mmap_sem in read mode. We need the
+ * is required to hold the mmap_lock in read mode. We need the
* anon_vma lock to serialize against concurrent expand_stacks.
*/
anon_vma_lock_write(vma->anon_vma);
@@ -2469,7 +2469,7 @@ int expand_downwards(struct vm_area_struct *vma,
if (!error) {
/*
* vma_gap_update() doesn't support concurrent
- * updates, but we only hold a shared mmap_sem
+ * updates, but we only hold a shared mmap_lock
* lock here, so we need to protect against
* concurrent vma expansions.
* anon_vma_lock_write() doesn't help here, as
@@ -2855,7 +2855,7 @@ static int __vm_munmap(unsigned long start, size_t len, bool downgrade)
ret = __do_munmap(mm, start, len, &uf, downgrade);
/*
- * Returning 1 indicates mmap_sem is downgraded.
+ * Returning 1 indicates mmap_lock is downgraded.
* But 1 is not legal return value of vm_munmap() and munmap(), reset
* it to 0 before return.
*/
@@ -3107,12 +3107,12 @@ void exit_mmap(struct mm_struct *mm)
/*
* Manually reap the mm to free as much memory as possible.
* Then, as the oom reaper does, set MMF_OOM_SKIP to disregard
- * this mm from further consideration. Taking mm->mmap_sem for
+ * this mm from further consideration. Taking mm->mmap_lock for
* write after setting MMF_OOM_SKIP will guarantee that the oom
- * reaper will not run on this mm again after mmap_sem is
+ * reaper will not run on this mm again after mmap_lock is
* dropped.
*
- * Nothing can be holding mm->mmap_sem here and the above call
+ * Nothing can be holding mm->mmap_lock here and the above call
* to mmu_notifier_release(mm) ensures mmu notifier callbacks in
* __oom_reap_task_mm() will not block.
*
@@ -3437,7 +3437,7 @@ bool vma_is_special_mapping(const struct vm_area_struct *vma,
}
/*
- * Called with mm->mmap_sem held for writing.
+ * Called with mm->mmap_lock held for writing.
* Insert a new vma covering the given region, with the given flags.
* Its pages are supplied by the given array of struct page *.
* The array can be shorter than len >> PAGE_SHIFT if it's null-terminated.
@@ -3513,11 +3513,11 @@ static void vm_lock_mapping(struct mm_struct *mm, struct address_space *mapping)
* operations that could ever happen on a certain mm. This includes
* vmtruncate, try_to_unmap, and all page faults.
*
- * The caller must take the mmap_sem in write mode before calling
+ * The caller must take the mmap_lock in write mode before calling
* mm_take_all_locks(). The caller isn't allowed to release the
- * mmap_sem until mm_drop_all_locks() returns.
+ * mmap_lock until mm_drop_all_locks() returns.
*
- * mmap_sem in write mode is required in order to block all operations
+ * mmap_lock in write mode is required in order to block all operations
* that could modify pagetables and free pages without need of
* altering the vma layout. It's also needed in write mode to avoid new
* anon_vmas to be associated with existing vmas.
@@ -3622,7 +3622,7 @@ static void vm_unlock_mapping(struct address_space *mapping)
}
/*
- * The mmap_sem cannot be released by the caller until
+ * The mmap_lock cannot be released by the caller until
* mm_drop_all_locks() returns.
*/
void mm_drop_all_locks(struct mm_struct *mm)
diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c
index a3538cb2bcbe..03c33c93a582 100644
--- a/mm/mmu_gather.c
+++ b/mm/mmu_gather.c
@@ -301,7 +301,7 @@ void tlb_finish_mmu(struct mmu_gather *tlb,
{
/*
* If there are parallel threads are doing PTE changes on same range
- * under non-exclusive lock (e.g., mmap_sem read-side) but defer TLB
+ * under non-exclusive lock (e.g., mmap_lock read-side) but defer TLB
* flush by batching, one thread may end up seeing inconsistent PTEs
* and result in having stale TLB entries. So flush TLB forcefully
* if we detect parallel PTE batching threads.
diff --git a/mm/mmu_notifier.c b/mm/mmu_notifier.c
index 2f348b6c9c9a..352bb9f3ecc0 100644
--- a/mm/mmu_notifier.c
+++ b/mm/mmu_notifier.c
@@ -599,7 +599,7 @@ void __mmu_notifier_invalidate_range(struct mm_struct *mm,
}
/*
- * Same as mmu_notifier_register but here the caller must hold the mmap_sem in
+ * Same as mmu_notifier_register but here the caller must hold the mmap_lock in
* write mode. A NULL mn signals the notifier is being registered for itree
* mode.
*/
@@ -623,7 +623,7 @@ int __mmu_notifier_register(struct mmu_notifier *subscription,
/*
* kmalloc cannot be called under mm_take_all_locks(), but we
* know that mm->notifier_subscriptions can't change while we
- * hold the write side of the mmap_sem.
+ * hold the write side of the mmap_lock.
*/
subscriptions = kzalloc(
sizeof(struct mmu_notifier_subscriptions), GFP_KERNEL);
@@ -655,7 +655,7 @@ int __mmu_notifier_register(struct mmu_notifier *subscription,
* readers. acquire can only be used while holding the mmgrab or
* mmget, and is safe because once created the
* mmu_notifier_subscriptions is not freed until the mm is destroyed.
- * As above, users holding the mmap_sem or one of the
+ * As above, users holding the mmap_lock or one of the
* mm_take_all_locks() do not need to use acquire semantics.
*/
if (subscriptions)
@@ -689,7 +689,7 @@ EXPORT_SYMBOL_GPL(__mmu_notifier_register);
* @mn: The notifier to attach
* @mm: The mm to attach the notifier to
*
- * Must not hold mmap_sem nor any other VM related lock when calling
+ * Must not hold mmap_lock nor any other VM related lock when calling
* this registration function. Must also ensure mm_users can't go down
* to zero while this runs to avoid races with mmu_notifier_release,
* so mm has to be current->mm or the mm should be pinned safely such
@@ -750,7 +750,7 @@ find_get_mmu_notifier(struct mm_struct *mm, const struct mmu_notifier_ops *ops)
* are the same.
*
* Each call to mmu_notifier_get() must be paired with a call to
- * mmu_notifier_put(). The caller must hold the write side of mm->mmap_sem.
+ * mmu_notifier_put(). The caller must hold the write side of mm->mmap_lock.
*
* While the caller has a mmu_notifier get the mm pointer will remain valid,
* and can be converted to an active mm pointer via mmget_not_zero().
diff --git a/mm/mprotect.c b/mm/mprotect.c
index ee27e44a7e07..ce8b8a5eacbb 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -49,7 +49,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
bool uffd_wp_resolve = cp_flags & MM_CP_UFFD_WP_RESOLVE;
/*
- * Can be called with only the mmap_sem for reading by
+ * Can be called with only the mmap_lock for reading by
* prot_numa so we must check the pmd isn't constantly
* changing from under us from pmd_none to pmd_trans_huge
* and/or the other way around.
@@ -59,7 +59,7 @@ static unsigned long change_pte_range(struct vm_area_struct *vma, pmd_t *pmd,
/*
* The pmd points to a regular pte so the pmd can't change
- * from under us even if the mmap_sem is only hold for
+ * from under us even if the mmap_lock is only hold for
* reading.
*/
pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl);
@@ -228,7 +228,7 @@ static inline unsigned long change_pmd_range(struct vm_area_struct *vma,
next = pmd_addr_end(addr, end);
/*
- * Automatic NUMA balancing walks the tables with mmap_sem
+ * Automatic NUMA balancing walks the tables with mmap_lock
* held for read. It's possible a parallel update to occur
* between pmd_trans_huge() and a pmd_none_or_clear_bad()
* check leading to a false positive and clearing.
@@ -477,7 +477,7 @@ mprotect_fixup(struct vm_area_struct *vma, struct vm_area_struct **pprev,
success:
/*
- * vm_flags and vm_page_prot are protected by the mmap_sem
+ * vm_flags and vm_page_prot are protected by the mmap_lock
* held in write mode.
*/
vma->vm_flags = newflags;
diff --git a/mm/mremap.c b/mm/mremap.c
index 0a2f0efd2939..5dd572d57ca9 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -146,7 +146,7 @@ static void move_ptes(struct vm_area_struct *vma, pmd_t *old_pmd,
/*
* We don't have to worry about the ordering of src and dst
- * pte locks because exclusive mmap_sem prevents deadlock.
+ * pte locks because exclusive mmap_lock prevents deadlock.
*/
old_pte = pte_offset_map_lock(mm, old_pmd, old_addr, &old_ptl);
new_pte = pte_offset_map(new_pmd, new_addr);
@@ -213,7 +213,7 @@ static bool move_normal_pmd(struct vm_area_struct *vma, unsigned long old_addr,
/*
* We don't have to worry about the ordering of src and dst
- * ptlocks because exclusive mmap_sem prevents deadlock.
+ * ptlocks because exclusive mmap_lock prevents deadlock.
*/
old_ptl = pmd_lock(vma->vm_mm, old_pmd);
new_ptl = pmd_lockptr(mm, new_pmd);
@@ -710,7 +710,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
* Always allow a shrinking remap: that just unmaps
* the unnecessary pages..
* __do_munmap does all the needed commit accounting, and
- * downgrades mmap_sem to read if so directed.
+ * downgrades mmap_lock to read if so directed.
*/
if (old_len >= new_len) {
int retval;
@@ -720,7 +720,7 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len,
if (retval < 0 && old_len != new_len) {
ret = retval;
goto out;
- /* Returning 1 indicates mmap_sem is downgraded to read. */
+ /* Returning 1 indicates mmap_lock is downgraded to read. */
} else if (retval == 1)
downgraded = true;
ret = addr;
diff --git a/mm/nommu.c b/mm/nommu.c
index 8c3a04784dbe..cdcad5d61dd1 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -582,7 +582,7 @@ static void put_nommu_region(struct vm_region *region)
* add a VMA into a process's mm_struct in the appropriate place in the list
* and tree and add to the address space's page tree also if not an anonymous
* page
- * - should be called with mm->mmap_sem held writelocked
+ * - should be called with mm->mmap_lock held writelocked
*/
static void add_vma_to_mm(struct mm_struct *mm, struct vm_area_struct *vma)
{
@@ -696,7 +696,7 @@ static void delete_vma(struct mm_struct *mm, struct vm_area_struct *vma)
/*
* look up the first VMA in which addr resides, NULL if none
- * - should be called with mm->mmap_sem at least held readlocked
+ * - should be called with mm->mmap_lock at least held readlocked
*/
struct vm_area_struct *find_vma(struct mm_struct *mm, unsigned long addr)
{
@@ -742,7 +742,7 @@ int expand_stack(struct vm_area_struct *vma, unsigned long address)
/*
* look up the first VMA exactly that exactly matches addr
- * - should be called with mm->mmap_sem at least held readlocked
+ * - should be called with mm->mmap_lock at least held readlocked
*/
static struct vm_area_struct *find_vma_exact(struct mm_struct *mm,
unsigned long addr,
diff --git a/mm/oom_kill.c b/mm/oom_kill.c
index 3b5d78dfebe9..b4e9491cb320 100644
--- a/mm/oom_kill.c
+++ b/mm/oom_kill.c
@@ -898,7 +898,7 @@ static void __oom_kill_process(struct task_struct *victim, const char *message)
/*
* Kill all user processes sharing victim->mm in other thread groups, if
* any. They don't get access to memory reserves, though, to avoid
- * depletion of all memory. This prevents mm->mmap_sem livelock when an
+ * depletion of all memory. This prevents mm->mmap_lock livelock when an
* oom killed thread cannot exit because it requires the semaphore and
* its contended by another thread trying to allocate memory itself.
* That thread will now get access to memory reserves since it has a
diff --git a/mm/pagewalk.c b/mm/pagewalk.c
index 3b452aa05cd0..e81640d9f177 100644
--- a/mm/pagewalk.c
+++ b/mm/pagewalk.c
@@ -373,7 +373,7 @@ static int __walk_page_range(unsigned long start, unsigned long end,
* caller-specific data to callbacks, @private should be helpful.
*
* Locking:
- * Callers of walk_page_range() and walk_page_vma() should hold @mm->mmap_sem,
+ * Callers of walk_page_range() and walk_page_vma() should hold @mm->mmap_lock,
* because these function traverse vma list and/or access to vma's data.
*/
int walk_page_range(struct mm_struct *mm, unsigned long start,
@@ -498,11 +498,11 @@ int walk_page_vma(struct vm_area_struct *vma, const struct mm_walk_ops *ops,
* Also see walk_page_range() for additional information.
*
* Locking:
- * This function can't require that the struct mm_struct::mmap_sem is held,
+ * This function can't require that the struct mm_struct::mmap_lock is held,
* since @mapping may be mapped by multiple processes. Instead
* @mapping->i_mmap_rwsem must be held. This might have implications in the
* callbacks, and it's up tho the caller to ensure that the
- * struct mm_struct::mmap_sem is not needed.
+ * struct mm_struct::mmap_lock is not needed.
*
* Also this means that a caller can't rely on the struct
* vm_area_struct::vm_flags to be constant across a call,
diff --git a/mm/rmap.c b/mm/rmap.c
index ad4a0fdcc94c..5fe2dedce1fc 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -21,7 +21,7 @@
* Lock ordering in mm:
*
* inode->i_mutex (while writing or truncating, not reading or faulting)
- * mm->mmap_sem
+ * mm->mmap_lock
* page->flags PG_locked (lock_page) * (see huegtlbfs below)
* hugetlbfs_i_mmap_rwsem_key (in huge_pmd_share)
* mapping->i_mmap_rwsem
@@ -177,7 +177,7 @@ static void anon_vma_chain_link(struct vm_area_struct *vma,
* to do any locking for the common case of already having
* an anon_vma.
*
- * This must be called with the mmap_sem held for reading.
+ * This must be called with the mmap_lock held for reading.
*/
int __anon_vma_prepare(struct vm_area_struct *vma)
{
@@ -1444,7 +1444,7 @@ static bool try_to_unmap_one(struct page *page, struct vm_area_struct *vma,
if (!PageTransCompound(page)) {
/*
* Holding pte lock, we do *not* need
- * mmap_sem here
+ * mmap_lock here
*/
mlock_vma_page(page);
}
@@ -1817,7 +1817,7 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page,
/*
* Note: remove_migration_ptes() cannot use page_lock_anon_vma_read()
* because that depends on page_mapped(); but not all its usages
- * are holding mmap_sem. Users without mmap_sem are required to
+ * are holding mmap_lock. Users without mmap_lock are required to
* take a reference count to prevent the anon_vma disappearing
*/
anon_vma = page_anon_vma(page);
@@ -1837,7 +1837,7 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page,
* Find all the mappings of a page using the mapping pointer and the vma chains
* contained in the anon_vma struct it points to.
*
- * When called from try_to_munlock(), the mmap_sem of the mm containing the vma
+ * When called from try_to_munlock(), the mmap_lock of the mm containing the vma
* where the page was found will be held for write. So, we won't recheck
* vm_flags for that VMA. That should be OK, because that vma shouldn't be
* LOCKED.
@@ -1889,7 +1889,7 @@ static void rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc,
* Find all the mappings of a page using the mapping pointer and the vma chains
* contained in the address_space struct it points to.
*
- * When called from try_to_munlock(), the mmap_sem of the mm containing the vma
+ * When called from try_to_munlock(), the mmap_lock of the mm containing the vma
* where the page was found will be held for write. So, we won't recheck
* vm_flags for that VMA. That should be OK, because that vma shouldn't be
* LOCKED.
diff --git a/mm/shmem.c b/mm/shmem.c
index 207fa263a410..a0dbe62f8042 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -2319,7 +2319,7 @@ static int shmem_mfill_atomic_pte(struct mm_struct *dst_mm,
PAGE_SIZE);
kunmap_atomic(page_kaddr);
- /* fallback to copy_from_user outside mmap_sem */
+ /* fallback to copy_from_user outside mmap_lock */
if (unlikely(ret)) {
*pagep = page;
shmem_inode_unacct_blocks(inode, 1);
@@ -4136,7 +4136,7 @@ int shmem_zero_setup(struct vm_area_struct *vma)
loff_t size = vma->vm_end - vma->vm_start;
/*
- * Cloning a new file under mmap_sem leads to a lock ordering conflict
+ * Cloning a new file under mmap_lock leads to a lock ordering conflict
* between XFS directory reading and selinux: since this file is only
* accessible to the user through its mapping, use S_PRIVATE flag to
* bypass file security, in the same way as shmem_kernel_file_setup().
diff --git a/mm/swap_state.c b/mm/swap_state.c
index 516e29d768c6..e98ff460e9e9 100644
--- a/mm/swap_state.c
+++ b/mm/swap_state.c
@@ -552,7 +552,7 @@ static unsigned long swapin_nr_pages(unsigned long offset)
* This has been extended to use the NUMA policies from the mm triggering
* the readahead.
*
- * Caller must hold read mmap_sem if vmf->vma is not NULL.
+ * Caller must hold read mmap_lock if vmf->vma is not NULL.
*/
struct page *swap_cluster_readahead(swp_entry_t entry, gfp_t gfp_mask,
struct vm_fault *vmf)
@@ -734,7 +734,7 @@ static void swap_ra_info(struct vm_fault *vmf,
* Primitive swap readahead code. We simply read in a few pages whoes
* virtual addresses are around the fault address in the same vma.
*
- * Caller must hold read mmap_sem if vmf->vma is not NULL.
+ * Caller must hold read mmap_lock if vmf->vma is not NULL.
*
*/
static struct page *swap_vma_readahead(swp_entry_t fentry, gfp_t gfp_mask,
diff --git a/mm/userfaultfd.c b/mm/userfaultfd.c
index 691613c5db9f..b80419320c7d 100644
--- a/mm/userfaultfd.c
+++ b/mm/userfaultfd.c
@@ -76,7 +76,7 @@ static int mcopy_atomic_pte(struct mm_struct *dst_mm,
PAGE_SIZE);
kunmap_atomic(page_kaddr);
- /* fallback to copy_from_user outside mmap_sem */
+ /* fallback to copy_from_user outside mmap_lock */
if (unlikely(ret)) {
ret = -ENOENT;
*pagep = page;
@@ -200,7 +200,7 @@ static pmd_t *mm_alloc_pmd(struct mm_struct *mm, unsigned long address)
#ifdef CONFIG_HUGETLB_PAGE
/*
* __mcopy_atomic processing for HUGETLB vmas. Note that this routine is
- * called with mmap_sem held, it will release mmap_sem before returning.
+ * called with mmap_lock held, it will release mmap_lock before returning.
*/
static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
struct vm_area_struct *dst_vma,
@@ -247,7 +247,7 @@ static __always_inline ssize_t __mcopy_atomic_hugetlb(struct mm_struct *dst_mm,
retry:
/*
- * On routine entry dst_vma is set. If we had to drop mmap_sem and
+ * On routine entry dst_vma is set. If we had to drop mmap_lock and
* retry, dst_vma will be set to NULL and we must lookup again.
*/
if (!dst_vma) {
@@ -357,7 +357,7 @@ out:
* private and shared mappings. See the routine
* restore_reserve_on_error for details. Unfortunately, we
* can not call restore_reserve_on_error now as it would
- * require holding mmap_sem.
+ * require holding mmap_lock.
*
* If a reservation for the page existed in the reservation
* map of a private mapping, the map was modified to indicate
diff --git a/mm/util.c b/mm/util.c
index 09f62d7d6e3e..c63c8e47be57 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -425,7 +425,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm, struct rlimit *rlim_stack)
* @bypass_rlim: %true if checking RLIMIT_MEMLOCK should be skipped
*
* Assumes @task and @mm are valid (i.e. at least one reference on each), and
- * that mmap_sem is held as writer.
+ * that mmap_lock is held as writer.
*
* Return:
* * 0 on success