From: Luke Yang Date: Tue, 11 Apr 2006 05:52:56 +0000 (-0700) Subject: [PATCH] nommu: use compound page in slab allocator X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d6fef9da19b7acd46e04b7dbbba726b3febeca94;p=GitHub%2Fmt8127%2Fandroid_kernel_alcatel_ttab.git [PATCH] nommu: use compound page in slab allocator The earlier patch to consolidate mmu and nommu page allocation and refcounting by using compound pages for nommu allocations had a bug: kmalloc slabs who's pages were initially allocated by a non-__GFP_COMP allocator could be passed into mm/nommu.c kmalloc allocations which really wanted __GFP_COMP underlying pages. Fix that by having nommu pass __GFP_COMP to all higher order slab allocations. Signed-off-by: Luke Yang Acked-by: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/mm/slab.c b/mm/slab.c index 752c5570f2f6..e6ef9bd52335 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -1456,7 +1456,14 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid) int i; flags |= cachep->gfpflags; +#ifndef CONFIG_MMU + /* nommu uses slab's for process anonymous memory allocations, so + * requires __GFP_COMP to properly refcount higher order allocations" + */ + page = alloc_pages_node(nodeid, (flags | __GFP_COMP), cachep->gfporder); +#else page = alloc_pages_node(nodeid, flags, cachep->gfporder); +#endif if (!page) return NULL; addr = page_address(page);