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-rw-r--r--arch/powerpc/mm/pgtable-radix.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/powerpc/mm/pgtable-radix.c b/arch/powerpc/mm/pgtable-radix.c
index 7be99fd9af15..c879979faa73 100644
--- a/arch/powerpc/mm/pgtable-radix.c
+++ b/arch/powerpc/mm/pgtable-radix.c
@@ -1045,20 +1045,22 @@ void radix__ptep_set_access_flags(struct vm_area_struct *vma, pte_t *ptep,
struct mm_struct *mm = vma->vm_mm;
unsigned long set = pte_val(entry) & (_PAGE_DIRTY | _PAGE_ACCESSED |
_PAGE_RW | _PAGE_EXEC);
+
+ unsigned long change = pte_val(entry) ^ pte_val(*ptep);
/*
* To avoid NMMU hang while relaxing access, we need mark
* the pte invalid in between.
*/
- if (atomic_read(&mm->context.copros) > 0) {
+ if ((change & _PAGE_RW) && atomic_read(&mm->context.copros) > 0) {
unsigned long old_pte, new_pte;
- old_pte = __radix_pte_update(ptep, ~0, 0);
+ old_pte = __radix_pte_update(ptep, _PAGE_PRESENT, _PAGE_INVALID);
/*
* new value of pte
*/
new_pte = old_pte | set;
radix__flush_tlb_page_psize(mm, address, psize);
- __radix_pte_update(ptep, 0, new_pte);
+ __radix_pte_update(ptep, _PAGE_INVALID, new_pte);
} else {
__radix_pte_update(ptep, 0, set);
/*