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From:   Miaohe Lin <linmiaohe@huawei.com>
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Subject: [PATCH v3 4/6] mm/huge_memory.c: remove redundant PageCompound() check
Date:   Thu, 18 Mar 2021 08:27:20 -0400
Message-ID: <20210318122722.13135-5-linmiaohe@huawei.com>
In-Reply-To: <20210318122722.13135-1-linmiaohe@huawei.com>
References: <20210318122722.13135-1-linmiaohe@huawei.com>
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The !PageCompound() check limits the page must be head or tail while
!PageHead() further limits it to page head only. So !PageHead() check
is equivalent here.

Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
---
 mm/huge_memory.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 23964adf5db2..52acc3954afd 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1291,7 +1291,7 @@ vm_fault_t do_huge_pmd_wp_page(struct vm_fault *vmf, pmd_t orig_pmd)
 	}
 
 	page = pmd_page(orig_pmd);
-	VM_BUG_ON_PAGE(!PageCompound(page) || !PageHead(page), page);
+	VM_BUG_ON_PAGE(!PageHead(page), page);
 
 	/* Lock page for reuse_swap_page() */
 	if (!trylock_page(page)) {
-- 
2.19.1