Merge remote-tracking branch 'asoc/topic/pcm5102a' into asoc-next

[linux-2.6-block.git] / arch / arm64 / mm / mmu.c

diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c
index 84a019f5502293dbe0c28cc078465e4ddd6c2096..2dbb2c9f1ec1770e7f9f5aca7176eac2cc153d32 100644 (file)
--- a/arch/arm64/mm/mmu.c
+++ b/arch/arm64/mm/mmu.c
@@ -108,7 +108,7 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
         * The following mapping attributes may be updated in live
         * kernel mappings without the need for break-before-make.
         */
-       static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE;
+       static const pteval_t mask = PTE_PXN | PTE_RDONLY | PTE_WRITE | PTE_NG;
 
        /* creating or taking down mappings is always safe */
        if (old == 0 || new == 0)
@@ -118,9 +118,9 @@ static bool pgattr_change_is_safe(u64 old, u64 new)
        if ((old | new) & PTE_CONT)
                return false;
 
-       /* Transitioning from Global to Non-Global is safe */
-       if (((old ^ new) == PTE_NG) && (new & PTE_NG))
-               return true;
+       /* Transitioning from Non-Global to Global is unsafe */
+       if (old & ~new & PTE_NG)
+               return false;
 
        return ((old ^ new) & ~mask) == 0;
 }
@@ -972,3 +972,13 @@ int pmd_clear_huge(pmd_t *pmdp)
        pmd_clear(pmdp);
        return 1;
 }
+
+int pud_free_pmd_page(pud_t *pud)
+{
+       return pud_none(*pud);
+}
+
+int pmd_free_pte_page(pmd_t *pmd)
+{
+       return pmd_none(*pmd);
+}