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Message-ID: <4EC21D78.4080508@gmail.com> Date: Tue, 15 Nov 2011 16:06:16 +0800 From: Wang Sheng-Hui <shhuiw@...il.com> To: linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: [PATCH] mm: cleanup the comment for head/tail pages of compound pages in mm/page_alloc.c Per the void prep_compound_page(struct page *page, unsigned long order) code, compound pages use PG_head/PG_tail, and only tail pages point at head page using their ->first_page field. Signed-off-by: Wang Sheng-Hui <shhuiw@...il.com> --- mm/page_alloc.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 6e8ecb6..f645ce8 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -332,8 +332,8 @@ out: * * The remaining PAGE_SIZE pages are called "tail pages". * - * All pages have PG_compound set. All pages have their ->private pointing at - * the head page (even the head page has this). + * Head page has PG_head set, and all tail pages have PG_tail set. All tail + * pages have their ->first_page pointing at the head page. * * The first tail page's ->lru.next holds the address of the compound page's * put_page() function. Its ->lru.prev holds the order of allocation. -- 1.7.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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