diff options
| author | Miaohe Lin <linmiaohe@huawei.com> | 2022-08-16 21:05:51 +0800 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2022-09-11 20:25:55 -0700 |
| commit | 939de63d35dde45dbc10bd21f174f86629fbe78d (patch) | |
| tree | b890e34e225c78f4a4c0110995fd43508dc0628f /mm/hugetlb_vmemmap.c | |
| parent | 3a5497a2dae381cb1b201fb20847fb32a059da25 (diff) | |
| download | lwn-939de63d35dde45dbc10bd21f174f86629fbe78d.tar.gz lwn-939de63d35dde45dbc10bd21f174f86629fbe78d.zip | |
mm: hugetlb_vmemmap: add missing smp_wmb() before set_pte_at()
The memory barrier smp_wmb() is needed to make sure that preceding stores
to the page contents become visible before the below set_pte_at() write.
Link: https://lkml.kernel.org/r/20220816130553.31406-5-linmiaohe@huawei.com
Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
Reviewed-by: Yin Fengwei <fengwei.yin@intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>
Cc: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/hugetlb_vmemmap.c')
| -rw-r--r-- | mm/hugetlb_vmemmap.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/mm/hugetlb_vmemmap.c b/mm/hugetlb_vmemmap.c index 20f414c0379f..76b2d03a0d8d 100644 --- a/mm/hugetlb_vmemmap.c +++ b/mm/hugetlb_vmemmap.c @@ -287,6 +287,11 @@ static void vmemmap_restore_pte(pte_t *pte, unsigned long addr, copy_page(to, (void *)walk->reuse_addr); reset_struct_pages(to); + /* + * Makes sure that preceding stores to the page contents become visible + * before the set_pte_at() write. + */ + smp_wmb(); set_pte_at(&init_mm, addr, pte, mk_pte(page, pgprot)); } |