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authorMatthew Wilcox <mawilcox@microsoft.com>2018-06-07 17:08:50 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-07 17:34:37 -0700
commit4da1984edbbed0ffc961006d265d78a7b0095ea4 (patch)
treee9781a716119438adc0c241e5fbba2b9823f9c10 /mm
parentb7ccc7f8c643de0b71cd2da3245d0c27038a8dd7 (diff)
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.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 628fd3e24731..ef1811531999 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;