linux-kernel - [RFC][PATCH 8/9] x86/mm/pae: Use WRITE

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Date:   Mon, 30 Nov 2020 12:27:13 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     x86@...nel.org, willy@...radead.org
Cc:     linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        aarcange@...hat.com, kirill.shutemov@...ux.intel.com,
        jroedel@...e.de, peterz@...radead.org
Subject: [RFC][PATCH 8/9] x86/mm/pae: Use WRITE_ONCE()


Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
---
 arch/x86/include/asm/pgtable-3level.h |   10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

--- a/arch/x86/include/asm/pgtable-3level.h
+++ b/arch/x86/include/asm/pgtable-3level.h
@@ -27,9 +27,9 @@
  */
 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();
-	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)
@@ -58,14 +58,14 @@ static inline void native_set_pud(pud_t
 static inline void native_pte_clear(struct mm_struct *mm, unsigned long addr,
 				    pte_t *ptep)
 {
-	ptep->pte_low = 0;
+	WRITE_ONCE(ptep->pte_low, 0);
 	smp_wmb();
-	ptep->pte_high = 0;
+	WRITE_ONCE(ptep->pte_high, 0);
 }
 
 static inline void native_pmd_clear(pmd_t *pmdp)
 {
-	pmdp->pmd_low = 0;
+	WRITE_ONCE(pmdp->pmd_low, 0);
 	smp_wmb();
 	pmdp->pmd_high = 0;
 }