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mm-userfaultfd-recheck-dst_pmd-entry-in-move_pages_pte-fix

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The following WARN_ON_ONCE()s can also be expected to be triggered, so
remove them as well.

if (WARN_ON_ONCE(pmd_none(*dst_pmd)) ||  WARN_ON_ONCE(pmd_none(*src_pmd)) ||
    WARN_ON_ONCE(pmd_trans_huge(*dst_pmd)) || WARN_ON_ONCE(pmd_trans_huge(*src_pmd))

Link: https://lkml.kernel.org/r/20241210084156.89877-1-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: Dan Carpenter <dan.carpenter@linaro.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Will Deacon <will@kernel.org>
Cc: Zach O'Keefe <zokeefe@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Qi Zheng 2024-12-10 16:41:56 +08:00 committed by Andrew Morton
parent bb7abbaf18
commit 7f3440c80b
1 changed files with 2 additions and 2 deletions
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4
mm/userfaultfd.c
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@ -1193,8 +1193,8 @@ static int move_pages_pte(struct mm_struct *mm, pmd_t *dst_pmd, pmd_t *src_pmd,
}
/* Sanity checks before the operation */
if (WARN_ON_ONCE(pmd_none(*dst_pmd)) || WARN_ON_ONCE(pmd_none(*src_pmd)) ||
WARN_ON_ONCE(pmd_trans_huge(*dst_pmd)) || WARN_ON_ONCE(pmd_trans_huge(*src_pmd))) {
if (pmd_none(*dst_pmd) || pmd_none(*src_pmd) ||
pmd_trans_huge(*dst_pmd) || pmd_trans_huge(*src_pmd)) {
err = -EINVAL;
goto out;
}