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Date: Tue, 25 Sep 2012 09:56:54 -0400 From: Naoya Horiguchi <n-horiguchi@...jp.nec.com> To: Wu Fengguang <fengguang.wu@...el.com>, Andrew Morton <akpm@...ux-foundation.org> Cc: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>, Andi Kleen <andi.kleen@...el.com>, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: [PATCH] pagemap: fix wrong KPF_THP on slab pages KPF_THP can be set on non-huge compound pages like slab pages, because PageTransCompound only sees PG_head and PG_tail. Obviously this is a bug and breaks user space applications which look for thp via /proc/kpageflags. Currently thp is constructed only on anonymous pages, so this patch makes KPF_THP be set when both of PageAnon and PageTransCompound are true. Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com> --- fs/proc/page.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git v3.6-rc6.orig/fs/proc/page.c v3.6-rc6/fs/proc/page.c index 7fcd0d6..613102d 100644 --- v3.6-rc6.orig/fs/proc/page.c +++ v3.6-rc6/fs/proc/page.c @@ -115,7 +115,7 @@ u64 stable_page_flags(struct page *page) u |= 1 << KPF_COMPOUND_TAIL; if (PageHuge(page)) u |= 1 << KPF_HUGE; - else if (PageTransCompound(page)) + else if (PageTransCompound(page) && PageAnon(page)) u |= 1 << KPF_THP; /* -- 1.7.11.4 -- 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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