diff options
Diffstat (limited to 'include/asm-ia64/pgtable.h')
| -rw-r--r-- | include/asm-ia64/pgtable.h | 25 |
1 files changed, 16 insertions, 9 deletions
diff --git a/include/asm-ia64/pgtable.h b/include/asm-ia64/pgtable.h index 670b706411b..6580f31b313 100644 --- a/include/asm-ia64/pgtable.h +++ b/include/asm-ia64/pgtable.h @@ -533,16 +533,23 @@ extern void lazy_mmu_prot_update (pte_t pte); * daccess_bit in ivt.S). */ #ifdef CONFIG_SMP -# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ -do { \ - if (__safely_writable) { \ - set_pte(__ptep, __entry); \ - flush_tlb_page(__vma, __addr); \ - } \ -} while (0) +# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed && __safely_writable) { \ + set_pte(__ptep, __entry); \ + flush_tlb_page(__vma, __addr); \ + } \ + __changed; \ +}) #else -# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ - ptep_establish(__vma, __addr, __ptep, __entry) +# define ptep_set_access_flags(__vma, __addr, __ptep, __entry, __safely_writable) \ +({ \ + int __changed = !pte_same(*(__ptep), __entry); \ + if (__changed) \ + ptep_establish(__vma, __addr, __ptep, __entry); \ + __changed; \ +}) #endif # ifdef CONFIG_VIRTUAL_MEM_MAP |