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mm/swapops: make is_pmd_migration_entry more strict

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A pmd migration entry should first be a swap pmd,so use is_swap_pmd(pmd)
instead of !pmd_present(pmd).

On the other hand, some architecture (MIPS for example) may misjudge a
pmd_none entry as a pmd migration entry.

Link: https://lkml.kernel.org/r/1651131333-6386-1-git-send-email-zhanghongchen@loongson.cn
Signed-off-by: Hongchen Zhang <zhanghongchen@loongson.cn>
Acked-by: Peter Xu <peterx@redhat.com>
Cc: Alistair Popple <apopple@nvidia.com>
Cc: Ralph Campbell <rcampbell@nvidia.com>
Cc: Naoya Horiguchi <naoya.horiguchi@nec.com>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Hongchen Zhang 2022-05-09 18:20:53 -07:00 committed by Andrew Morton
parent 5b4494896c
commit b304c6f0d3
1 changed files with 1 additions and 1 deletions
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2
include/linux/swapops.h
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@ -331,7 +331,7 @@ static inline pmd_t swp_entry_to_pmd(swp_entry_t entry)
static inline int is_pmd_migration_entry(pmd_t pmd)
{
return !pmd_present(pmd) && is_migration_entry(pmd_to_swp_entry(pmd));
return is_swap_pmd(pmd) && is_migration_entry(pmd_to_swp_entry(pmd));
}
#else
static inline int set_pmd_migration_entry(struct page_vma_mapped_walk *pvmw,