mm/huge_memory.c: remove redundant PageCompound() check

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.

Link: https://lkml.kernel.org/r/20210318122722.13135-5-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Cc: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Michel Lespinasse <walken@google.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Thomas Hellstrm (Intel) <thomas_os@shipmail.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Wei Yang <richard.weiyang@linux.alibaba.com>
Cc: William Kucharski <william.kucharski@oracle.com>
Cc: Yang Shi <yang.shi@linux.alibaba.com>
Cc: yuleixzhang <yulei.kernel@gmail.com>
Cc: Zi Yan <ziy@nvidia.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 23964adf5db2ba664c1898145c0052bc5e642cb5..52acc3954afdd7418de361e1088db6b7a7b3fa35 100644 (file)
--- 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)) {