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authorNick Piggin <npiggin@suse.de>2006-03-22 00:08:34 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-03-22 07:54:01 -0800
commit84097518d1ecd2330f9488e4c2d09953a3340e74 (patch)
tree50981fe0584c456a1a86e6d7f611eec223b5f536 /mm/slab.c
parent0f8053a509ceba4a077a50ea7b77039b5559b428 (diff)
[PATCH] mm: nommu use compound pages
Now that compound page handling is properly fixed in the VM, move nommu over to using compound pages rather than rolling their own refcounting. nommu vm page refcounting is broken anyway, but there is no need to have divergent code in the core VM now, nor when it gets fixed. Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: David Howells <dhowells@redhat.com> (Needs testing, please). Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c9
1 files changed, 8 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c
index f477acfb732f..ff0ab772f49d 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -590,6 +590,8 @@ static inline void page_set_cache(struct page *page, struct kmem_cache *cache)
static inline struct kmem_cache *page_get_cache(struct page *page)
{
+ if (unlikely(PageCompound(page)))
+ page = (struct page *)page_private(page);
return (struct kmem_cache *)page->lru.next;
}
@@ -600,6 +602,8 @@ static inline void page_set_slab(struct page *page, struct slab *slab)
static inline struct slab *page_get_slab(struct page *page)
{
+ if (unlikely(PageCompound(page)))
+ page = (struct page *)page_private(page);
return (struct slab *)page->lru.prev;
}
@@ -2412,8 +2416,11 @@ static void set_slab_attr(struct kmem_cache *cachep, struct slab *slabp,
struct page *page;
/* Nasty!!!!!! I hope this is OK. */
- i = 1 << cachep->gfporder;
page = virt_to_page(objp);
+
+ i = 1;
+ if (likely(!PageCompound(page)))
+ i <<= cachep->gfporder;
do {
page_set_cache(page, cachep);
page_set_slab(page, slabp);