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x86/mm/pae: Use WRITE_ONCE()

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Disallow write-tearing, that would be really unfortunate.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lkml.kernel.org/r/20221022114425.038102604%40infradead.org
This commit is contained in:
Peter Zijlstra 2020-11-26 17:40:12 +01:00 committed by Dave Hansen
parent 7a9b8bdb6a
commit f7bcd4617d
1 changed files with 6 additions and 6 deletions
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12
arch/x86/include/asm/pgtable-3level.h
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@ -27,9 +27,9 @@
*/ */
static inline void native_set_pte(pte_t *ptep, pte_t pte) static inline void native_set_pte(pte_t *ptep, pte_t pte)
{ {
ptep->pte_high = pte.pte_high; WRITE_ONCE(ptep->pte_high, pte.pte_high);
smp_wmb(); smp_wmb();
ptep->pte_low = pte.pte_low; WRITE_ONCE(ptep->pte_low, pte.pte_low);
} }
static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte) static inline void native_set_pte_atomic(pte_t *ptep, pte_t pte)
@ -58,16 +58,16 @@ static inline void native_set_pud(pud_t *pudp, pud_t pud)
static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr, static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
pte_t *ptep) pte_t *ptep)
{ {
ptep->pte_low = 0; WRITE_ONCE(ptep->pte_low, 0);
smp_wmb(); smp_wmb();
ptep->pte_high = 0; WRITE_ONCE(ptep->pte_high, 0);
} }
static inline void native_pmd_clear(pmd_t *pmdp) static inline void native_pmd_clear(pmd_t *pmdp)
{ {
pmdp->pmd_low = 0; WRITE_ONCE(pmdp->pmd_low, 0);
smp_wmb(); smp_wmb();
pmdp->pmd_high = 0; WRITE_ONCE(pmdp->pmd_high, 0);
} }
static inline void native_pud_clear(pud_t *pudp) static inline void native_pud_clear(pud_t *pudp)