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| author | Qi Zheng <zhengqi.arch@bytedance.com> | 2022-08-18 16:27:48 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-11 20:25:58 -0700 |
| commit | c8bb41631bc2ecc6434e93232c031c7a218ebe81 (patch) | |
| tree | 92915ac1ef450913c173f3177ea0673be0ab5ea4 /mm/huge_memory.c | |
| parent | 48309e1f6f7b15b041b39b7f15e7adc1c7e2de95 (diff) | |
| download | linux-c8bb41631bc2ecc6434e93232c031c7a218ebe81.tar.bz2 | |
mm: thp: remove redundant pgtable check in set_huge_zero_page()
When the pgtable is NULL in the set_huge_zero_page(), we should not
increment the count of PTE page table pages by calling mm_inc_nr_ptes().
Otherwise we may receive the following warning when the mm exits:
BUG: non-zero pgtables_bytes on freeing mm
Now we can't observe the above warning since only
do_huge_pmd_anonymous_page() invokes set_huge_zero_page() and the pgtable
can not be NULL.
Therefore, instead of moving mm_inc_nr_ptes() to the non-NULL branch of
pgtable, it is better to remove the redundant pgtable check directly.
Link: https://lkml.kernel.org/r/20220818082748.40021-1-zhengqi.arch@bytedance.com
Signed-off-by: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
| -rw-r--r-- | mm/huge_memory.c | 3 |
1 files changed, 1 insertions, 2 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c index 37105d9aa4d2..286a70c3d5de 100644 --- a/mm/huge_memory.c +++ b/mm/huge_memory.c @@ -770,8 +770,7 @@ static void set_huge_zero_page(pgtable_t pgtable, struct mm_struct *mm, return; entry = mk_pmd(zero_page, vma->vm_page_prot); entry = pmd_mkhuge(entry); - if (pgtable) - pgtable_trans_huge_deposit(mm, pmd, pgtable); + pgtable_trans_huge_deposit(mm, pmd, pgtable); set_pmd_at(mm, haddr, pmd, entry); mm_inc_nr_ptes(mm); } |