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Date: Tue, 1 Jul 2014 10:46:22 -0400 From: Naoya Horiguchi <n-horiguchi@...jp.nec.com> To: Andrew Morton <akpm@...ux-foundation.org> Cc: Joonsoo Kim <iamjoonsoo.kim@....com>, Hugh Dickins <hughd@...gle.com>, Rik van Riel <riel@...hat.com>, Hillf Danton <dhillf@...il.com>, linux-kernel@...r.kernel.org, linux-mm@...ck.org, Naoya Horiguchi <nao.horiguchi@...il.com> Subject: [PATCH] rmap: fix pgoff calculation to handle hugepage correctly I triggered VM_BUG_ON() in vma_address() when I try to migrate an anonymous hugepage with mbind() in the kernel v3.16-rc3. This is because pgoff's calculation in rmap_walk_anon() fails to consider compound_order() only to have an incorrect value. So this patch fixes it. Signed-off-by: Naoya Horiguchi <n-horiguchi@...jp.nec.com> --- mm/rmap.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git v3.16-rc3.orig/mm/rmap.c v3.16-rc3/mm/rmap.c index b7e94ebbd09e..8cc964c6bd8d 100644 --- v3.16-rc3.orig/mm/rmap.c +++ v3.16-rc3/mm/rmap.c @@ -1639,7 +1639,7 @@ static struct anon_vma *rmap_walk_anon_lock(struct page *page, static int rmap_walk_anon(struct page *page, struct rmap_walk_control *rwc) { struct anon_vma *anon_vma; - pgoff_t pgoff = page->index << (PAGE_CACHE_SHIFT - PAGE_SHIFT); + pgoff_t pgoff = page->index << compound_order(page); struct anon_vma_chain *avc; int ret = SWAP_AGAIN; -- 1.9.3 -- 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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