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@xxxxxxxxxxxxx>
---
kernel/events/core.c | 2 +-
mm/gup.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/kernel/events/core.c
+++ b/kernel/events/core.c
@@ -7041,7 +7041,7 @@ static u64 perf_get_pgtable_size(struct
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;
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2467,7 +2467,7 @@ static int gup_pmd_range(pud_t *pudp, pu
pmdp = pmd_offset_lockless(pudp, pud, addr);
do {
- pmd_t pmd = READ_ONCE(*pmdp);
+ pmd_t pmd = pmdp_get_lockless(pmdp);
next = pmd_addr_end(addr, end);
if (!pmd_present(pmd))
