Messages in this thread Patch in this message | | | From | Naoya Horiguchi <> | Subject | [PATCH] pagemap: fix wrong KPF_THP on slab pages | Date | Tue, 25 Sep 2012 09:56:54 -0400 |
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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@ah.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
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