UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

x86/mm/pae: Use WRITE_ONCE() 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
arch/x86/include/asm/pgtable-3level.h
View File

@ -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)
@ -58,16 +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,
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;
WRITE_ONCE(pmdp->pmd_high, 0);
}
static inline void native_pud_clear(pud_t *pudp)