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| author |   Hongchen Zhang <zhanghongchen@loongson.cn> | 2022-05-09 18:20:53 -0700 |
|---|---|---|
| committer |   Andrew Morton <akpm@linux-foundation.org> | 2022-05-13 07:20:07 -0700 |
| commit | b304c6f0d39d927a87e72a8ac6c89b96ac25f355 (patch) | |
| tree | 29be4e485440f69532893b652bb4d0a486767577 /include/linux/swapops.h | |
| parent | mmap locking API: fix missed mmap_sem references in comments (diff) | |
| download | linux-dev-b304c6f0d39d927a87e72a8ac6c89b96ac25f355.tar.xz linux-dev-b304c6f0d39d927a87e72a8ac6c89b96ac25f355.zip | |
mm/swapops: make is_pmd_migration_entry more strict
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>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/swapops.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/swapops.h b/include/linux/swapops.h index d1b728904d4e..82265b055a0d 100644 --- a/include/linux/swapops.h +++ b/include/linux/swapops.h @@ -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, |