diff options
| author | David Hildenbrand <david@redhat.com> | 2025-03-03 17:29:57 +0100 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2025-03-17 22:06:44 -0700 |
| commit | 4eeec8c89a0c4a8c20fb13a4e7093cc8efce383d (patch) | |
| tree | fbce9bbbe93237023cc91cc99094fc9016e9ab36 /mm | |
| parent | 4996fc547f5b49f4a43c261dfadb02cf165cdb51 (diff) | |
mm: move hugetlb specific things in folio to page[3]
Let's just move the hugetlb specific stuff to a separate page, and stop
letting it overlay other fields for now.
This frees up some space in page[2], which we will use on 32bit to free up
some space in page[1]. While we could move these things to page[3]
instead, it's cleaner to just move the hugetlb specific things out of the
way and pack the core-folio stuff as tight as possible. ... and we can
minimize the work required in dump_folio.
We can now avoid re-initializing &folio->_deferred_list in hugetlb code.
Hopefully dynamically allocating "strut folio" in the future will further
clean this up.
Link: https://lkml.kernel.org/r/20250303163014.1128035-5-david@redhat.com
Signed-off-by: David Hildenbrand <david@redhat.com>
Cc: Andy Lutomirks^H^Hski <luto@kernel.org>
Cc: Borislav Betkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jann Horn <jannh@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Lance Yang <ioworker0@gmail.com>
Cc: Liam Howlett <liam.howlett@oracle.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcow (Oracle) <willy@infradead.org>
Cc: Michal Koutn <mkoutny@suse.com>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: tejun heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Zefan Li <lizefan.x@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/hugetlb.c | 1 | ||||
| -rw-r--r-- | mm/page_alloc.c | 5 |
2 files changed, 5 insertions, 1 deletions
diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 7a47a08e8526..438de55dd38d 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -1649,7 +1649,6 @@ static void __update_and_free_hugetlb_folio(struct hstate *h, folio_ref_unfreeze(folio, 1); - INIT_LIST_HEAD(&folio->_deferred_list); hugetlb_free_folio(folio); } diff --git a/mm/page_alloc.c b/mm/page_alloc.c index e1135dff9a86..735192222c36 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -971,6 +971,11 @@ static int free_tail_page_prepare(struct page *head_page, struct page *page) goto out; } break; + case 3: + /* the third tail page: hugetlb specifics overlap ->mappings */ + if (IS_ENABLED(CONFIG_HUGETLB_PAGE)) + break; + fallthrough; default: if (page->mapping != TAIL_MAPPING) { bad_page(page, "corrupted mapping in tail page"); |