From 945a11136ebdfa7fcce319ee6215958e84cb85f6 Mon Sep 17 00:00:00 2001 From: Akinobu Mita Date: Mon, 21 Sep 2009 17:01:47 -0700 Subject: [PATCH] mm: add gfp mask checking for __get_free_pages() __get_free_pages() with __GFP_HIGHMEM is not safe because the return address cannot represent a highmem page. get_zeroed_page() already has such a debug checking. Signed-off-by: Akinobu Mita Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- mm/page_alloc.c | 24 +++++++++--------------- 1 file changed, 9 insertions(+), 15 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index afda8fd16484..81926c7ef6f0 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1922,31 +1922,25 @@ EXPORT_SYMBOL(__alloc_pages_nodemask); */ unsigned long __get_free_pages(gfp_t gfp_mask, unsigned int order) { - struct page * page; + struct page *page; + + /* + * __get_free_pages() returns a 32-bit address, which cannot represent + * a highmem page + */ + VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); + page = alloc_pages(gfp_mask, order); if (!page) return 0; return (unsigned long) page_address(page); } - EXPORT_SYMBOL(__get_free_pages); unsigned long get_zeroed_page(gfp_t gfp_mask) { - struct page * page; - - /* - * get_zeroed_page() returns a 32-bit address, which cannot represent - * a highmem page - */ - VM_BUG_ON((gfp_mask & __GFP_HIGHMEM) != 0); - - page = alloc_pages(gfp_mask | __GFP_ZERO, 0); - if (page) - return (unsigned long) page_address(page); - return 0; + return __get_free_pages(gfp_mask | __GFP_ZERO, 0); } - EXPORT_SYMBOL(get_zeroed_page); void __pagevec_free(struct pagevec *pvec)