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authorPeter Zijlstra <peterz@infradead.org>2020-11-26 17:21:30 +0100
committerDave Hansen <dave.hansen@linux.intel.com>2022-12-15 10:37:27 -0800
commit1180e732c985ed3c8866d2fd9e02b619848404a0 (patch)
treed7ce6ce20c24e7c941683d8e5816337d9deb6515 /kernel
parentdab6e717429e5ec795d558a0e9a5337a1ed33a3d (diff)
mm/gup: Fix the lockless PMD access
On architectures where the PTE/PMD is larger than the native word size (i386-PAE for example), READ_ONCE() can do the wrong thing. Use pmdp_get_lockless() just like we use ptep_get_lockless(). Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Link: https://lkml.kernel.org/r/20221022114424.906110403%40infradead.org
Diffstat (limited to 'kernel')
-rw-r--r--kernel/events/core.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/kernel/events/core.c b/kernel/events/core.c
index 4ec3717003d5..b0d38424f3f7 100644
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7306,7 +7306,7 @@ static u64 perf_get_pgtable_size(struct mm_struct *mm, unsigned long addr)
return pud_leaf_size(pud);
pmdp = pmd_offset_lockless(pudp, pud, addr);
- pmd = READ_ONCE(*pmdp);
+ pmd = pmdp_get_lockless(pmdp);
if (!pmd_present(pmd))
return 0;