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-rw-r--r--mm/page_alloc.c35
1 files changed, 18 insertions, 17 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 7f65b5a63bb3..bdff85899638 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -212,6 +212,15 @@ static void destroy_compound_page(struct page *page, unsigned long order)
212 } 212 }
213} 213}
214 214
215static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
216{
217 int i;
218
219 BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM);
220 for (i = 0; i < (1 << order); i++)
221 clear_highpage(page + i);
222}
223
215/* 224/*
216 * function for dealing with page's order in buddy system. 225 * function for dealing with page's order in buddy system.
217 * zone->lock is already acquired when we use these. 226 * zone->lock is already acquired when we use these.
@@ -496,7 +505,7 @@ static inline void expand(struct zone *zone, struct page *page,
496/* 505/*
497 * This page is about to be returned from the page allocator 506 * This page is about to be returned from the page allocator
498 */ 507 */
499static int prep_new_page(struct page *page, int order) 508static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
500{ 509{
501 if (unlikely(page_mapcount(page) | 510 if (unlikely(page_mapcount(page) |
502 (page->mapping != NULL) | 511 (page->mapping != NULL) |
@@ -527,6 +536,13 @@ static int prep_new_page(struct page *page, int order)
527 set_page_private(page, 0); 536 set_page_private(page, 0);
528 set_page_refcounted(page); 537 set_page_refcounted(page);
529 kernel_map_pages(page, 1 << order, 1); 538 kernel_map_pages(page, 1 << order, 1);
539
540 if (gfp_flags & __GFP_ZERO)
541 prep_zero_page(page, order, gfp_flags);
542
543 if (order && (gfp_flags & __GFP_COMP))
544 prep_compound_page(page, order);
545
530 return 0; 546 return 0;
531} 547}
532 548
@@ -732,15 +748,6 @@ void fastcall free_cold_page(struct page *page)
732 free_hot_cold_page(page, 1); 748 free_hot_cold_page(page, 1);
733} 749}
734 750
735static inline void prep_zero_page(struct page *page, int order, gfp_t gfp_flags)
736{
737 int i;
738
739 BUG_ON((gfp_flags & (__GFP_WAIT | __GFP_HIGHMEM)) == __GFP_HIGHMEM);
740 for(i = 0; i < (1 << order); i++)
741 clear_highpage(page + i);
742}
743
744/* 751/*
745 * split_page takes a non-compound higher-order page, and splits it into 752 * split_page takes a non-compound higher-order page, and splits it into
746 * n (1<<order) sub-pages: page[0..n] 753 * n (1<<order) sub-pages: page[0..n]
@@ -802,14 +809,8 @@ again:
802 put_cpu(); 809 put_cpu();
803 810
804 BUG_ON(bad_range(zone, page)); 811 BUG_ON(bad_range(zone, page));
805 if (prep_new_page(page, order)) 812 if (prep_new_page(page, order, gfp_flags))
806 goto again; 813 goto again;
807
808 if (gfp_flags & __GFP_ZERO)
809 prep_zero_page(page, order, gfp_flags);
810
811 if (order && (gfp_flags & __GFP_COMP))
812 prep_compound_page(page, order);
813 return page; 814 return page;
814 815
815failed: 816failed: