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From:   Song Liu <songliubraving@fb.com>
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To:     <linux-mm@kvack.org>, <linux-fsdevel@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
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        <kernel-team@fb.com>, <william.kucharski@oracle.com>,
        <akpm@linux-foundation.org>, <hdanton@sina.com>,
        Song Liu <songliubraving@fb.com>
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Subject: [PATCH v9 2/6] filemap: update offset check in filemap_fault()
Date:   Mon, 24 Jun 2019 17:12:42 -0700
Message-ID: <20190625001246.685563-3-songliubraving@fb.com>
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With THP, current check of offset:

    VM_BUG_ON_PAGE(page->index != offset, page);

is no longer accurate. Update it to:

    VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);

Acked-by: Rik van Riel <riel@surriel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
---
 mm/filemap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/filemap.c b/mm/filemap.c
index f5b79a43946d..5f072a113535 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -2522,7 +2522,7 @@ vm_fault_t filemap_fault(struct vm_fault *vmf)
 		put_page(page);
 		goto retry_find;
 	}
-	VM_BUG_ON_PAGE(page->index != offset, page);
+	VM_BUG_ON_PAGE(page_to_pgoff(page) != offset, page);
 
 	/*
 	 * We have a locked page in the page cache, now we need to check
-- 
2.17.1