Rework ptep_set_access_flags and fix sun4c

[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / asm-powerpc / pgtable-ppc64.h

diff --git a/include/asm-powerpc/pgtable-ppc64.h b/include/asm-powerpc/pgtable-ppc64.h
index 704c4e669fe0ac9a1b72818b2922d97732d980b0..3cfd98f44bfe82286b55b1ca5aa2af442e993c4c 100644 (file)
--- a/include/asm-powerpc/pgtable-ppc64.h
+++ b/include/asm-powerpc/pgtable-ppc64.h
@@ -413,10 +413,14 @@ static inline void __ptep_set_access_flags(pte_t *ptep, pte_t entry, int dirty)
        :"cc");
 }
 #define  ptep_set_access_flags(__vma, __address, __ptep, __entry, __dirty) \
-       do {                                                               \
-               __ptep_set_access_flags(__ptep, __entry, __dirty);         \
-               flush_tlb_page_nohash(__vma, __address);                   \
-       } while(0)
+({                                                                        \
+       int __changed = !pte_same(*(__ptep), __entry);                     \
+       if (__changed) {                                                   \
+               __ptep_set_access_flags(__ptep, __entry, __dirty);         \
+               flush_tlb_page_nohash(__vma, __address);                   \
+       }                                                                  \
+       __changed;                                                         \
+})
 
 /*
  * Macro to mark a page protection value as "uncacheable".