diff options
Diffstat (limited to 'include/asm-i386/pgtable-3level.h')
| -rw-r--r-- | include/asm-i386/pgtable-3level.h | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/include/asm-i386/pgtable-3level.h b/include/asm-i386/pgtable-3level.h index 0d899173232e1f..7c58debdb39e61 100644 --- a/include/asm-i386/pgtable-3level.h +++ b/include/asm-i386/pgtable-3level.h @@ -58,6 +58,21 @@ static inline void set_pte(pte_t *ptep, pte_t pte) } #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval) +/* + * Since this is only called on user PTEs, and the page fault handler + * must handle the already racy situation of simultaneous page faults, + * we are justified in merely clearing the PTE present bit, followed + * by a set. The ordering here is important. + */ +static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte) +{ + ptep->pte_low = 0; + smp_wmb(); + ptep->pte_high = pte.pte_high; + smp_wmb(); + ptep->pte_low = pte.pte_low; +} + #define __HAVE_ARCH_SET_PTE_ATOMIC #define set_pte_atomic(pteptr,pteval) \ set_64bit((unsigned long long *)(pteptr),pte_val(pteval)) |