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authorAndrea Arcangeli <aarcange@redhat.com>2015-02-11 15:27:26 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2015-02-11 17:06:05 -0800
commit7e339128496284cc21977fba5416166ee81f5172 (patch)
tree6af95386953cc67f3f465b966e03cb56f184dd30
parenta7b780750e1a1c7833812681e1f8fa30bbb06802 (diff)
mm: gup: use get_user_pages_unlocked
This allows those get_user_pages calls to pass FAULT_FLAG_ALLOW_RETRY to the page fault in order to release the mmap_sem during the I/O. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Reviewed-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Cc: Andres Lagar-Cavilla <andreslc@google.com> Cc: Peter Feiner <pfeiner@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--drivers/media/pci/ivtv/ivtv-udma.c6
-rw-r--r--drivers/scsi/st.c7
-rw-r--r--drivers/video/fbdev/pvr2fb.c6
-rw-r--r--mm/process_vm_access.c7
-rw-r--r--net/ceph/pagevec.c6
5 files changed, 10 insertions, 22 deletions
diff --git a/drivers/media/pci/ivtv/ivtv-udma.c b/drivers/media/pci/ivtv/ivtv-udma.c
index bee2329e0b2e..24152accc66c 100644
--- a/drivers/media/pci/ivtv/ivtv-udma.c
+++ b/drivers/media/pci/ivtv/ivtv-udma.c
@@ -124,10 +124,8 @@ int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
}
/* Get user pages for DMA Xfer */
- down_read(&current->mm->mmap_sem);
- err = get_user_pages(current, current->mm,
- user_dma.uaddr, user_dma.page_count, 0, 1, dma->map, NULL);
- up_read(&current->mm->mmap_sem);
+ err = get_user_pages_unlocked(current, current->mm,
+ user_dma.uaddr, user_dma.page_count, 0, 1, dma->map);
if (user_dma.page_count != err) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
diff --git a/drivers/scsi/st.c b/drivers/scsi/st.c
index 128d3b55bdd9..9a1c34205254 100644
--- a/drivers/scsi/st.c
+++ b/drivers/scsi/st.c
@@ -4551,18 +4551,15 @@ static int sgl_map_user_pages(struct st_buffer *STbp,
return -ENOMEM;
/* Try to fault in all of the necessary pages */
- down_read(&current->mm->mmap_sem);
/* rw==READ means read from drive, write into memory area */
- res = get_user_pages(
+ res = get_user_pages_unlocked(
current,
current->mm,
uaddr,
nr_pages,
rw == READ,
0, /* don't force */
- pages,
- NULL);
- up_read(&current->mm->mmap_sem);
+ pages);
/* Errors and no page mapped should return here */
if (res < nr_pages)
diff --git a/drivers/video/fbdev/pvr2fb.c b/drivers/video/fbdev/pvr2fb.c
index 7c74f58fc101..0e24eb9c219c 100644
--- a/drivers/video/fbdev/pvr2fb.c
+++ b/drivers/video/fbdev/pvr2fb.c
@@ -686,10 +686,8 @@ static ssize_t pvr2fb_write(struct fb_info *info, const char *buf,
if (!pages)
return -ENOMEM;
- down_read(&current->mm->mmap_sem);
- ret = get_user_pages(current, current->mm, (unsigned long)buf,
- nr_pages, WRITE, 0, pages, NULL);
- up_read(&current->mm->mmap_sem);
+ ret = get_user_pages_unlocked(current, current->mm, (unsigned long)buf,
+ nr_pages, WRITE, 0, pages);
if (ret < nr_pages) {
nr_pages = ret;
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index 5077afcd9e11..b1597690530c 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -99,11 +99,8 @@ static int process_vm_rw_single_vec(unsigned long addr,
size_t bytes;
/* Get the pages we're interested in */
- down_read(&mm->mmap_sem);
- pages = get_user_pages(task, mm, pa, pages,
- vm_write, 0, process_pages, NULL);
- up_read(&mm->mmap_sem);
-
+ pages = get_user_pages_unlocked(task, mm, pa, pages,
+ vm_write, 0, process_pages);
if (pages <= 0)
return -EFAULT;
diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c
index 555013034f7a..096d91447e06 100644
--- a/net/ceph/pagevec.c
+++ b/net/ceph/pagevec.c
@@ -23,17 +23,15 @@ struct page **ceph_get_direct_page_vector(const void __user *data,
if (!pages)
return ERR_PTR(-ENOMEM);
- down_read(&current->mm->mmap_sem);
while (got < num_pages) {
- rc = get_user_pages(current, current->mm,
+ rc = get_user_pages_unlocked(current, current->mm,
(unsigned long)data + ((unsigned long)got * PAGE_SIZE),
- num_pages - got, write_page, 0, pages + got, NULL);
+ num_pages - got, write_page, 0, pages + got);
if (rc < 0)
break;
BUG_ON(rc == 0);
got += rc;
}
- up_read(&current->mm->mmap_sem);
if (rc < 0)
goto fail;
return pages;