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| author | Matthew Wilcox <mawilcox@microsoft.com> | 2018-06-07 17:08:50 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-07 17:34:37 -0700 |
| commit | 4da1984edbbed0ffc961006d265d78a7b0095ea4 (patch) | |
| tree | e9781a716119438adc0c241e5fbba2b9823f9c10 /mm | |
| parent | b7ccc7f8c643de0b71cd2da3245d0c27038a8dd7 (diff) | |
| download | op-kernel-dev-4da1984edbbed0ffc961006d265d78a7b0095ea4.zip op-kernel-dev-4da1984edbbed0ffc961006d265d78a7b0095ea4.tar.gz | |
mm: combine LRU and main union in struct page
This gives us five words of space in a single union in struct page. The
compound_mapcount moves position (from offset 24 to offset 20) on 64-bit
systems, but that does not seem likely to cause any trouble.
Link: http://lkml.kernel.org/r/20180518194519.3820-11-willy@infradead.org
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Christoph Lameter <cl@linux.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Jérôme Glisse <jglisse@redhat.com>
Cc: Lai Jiangshan <jiangshanlai@gmail.com>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: Randy Dunlap <rdunlap@infradead.org>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/page_alloc.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 628fd3e..ef18115 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -943,7 +943,7 @@ static int free_tail_pages_check(struct page *head_page, struct page *page) } switch (page - head_page) { case 1: - /* the first tail page: ->mapping is compound_mapcount() */ + /* the first tail page: ->mapping may be compound_mapcount() */ if (unlikely(compound_mapcount(page))) { bad_page(page, "nonzero compound_mapcount", 0); goto out; |
