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Diffstat (limited to 'arch/x86/include/asm/pgtable.h')
-rw-r--r--arch/x86/include/asm/pgtable.h26
1 files changed, 20 insertions, 6 deletions
diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h
index 06bbcbd66e9c..4f5af8447d54 100644
--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -302,16 +302,30 @@ static inline pte_t pte_mkspecial(pte_t pte)
extern pteval_t __supported_pte_mask;
+/*
+ * Mask out unsupported bits in a present pgprot. Non-present pgprots
+ * can use those bits for other purposes, so leave them be.
+ */
+static inline pgprotval_t massage_pgprot(pgprot_t pgprot)
+{
+ pgprotval_t protval = pgprot_val(pgprot);
+
+ if (protval & _PAGE_PRESENT)
+ protval &= __supported_pte_mask;
+
+ return protval;
+}
+
static inline pte_t pfn_pte(unsigned long page_nr, pgprot_t pgprot)
{
- return __pte((((phys_addr_t)page_nr << PAGE_SHIFT) |
- pgprot_val(pgprot)) & __supported_pte_mask);
+ return __pte(((phys_addr_t)page_nr << PAGE_SHIFT) |
+ massage_pgprot(pgprot));
}
static inline pmd_t pfn_pmd(unsigned long page_nr, pgprot_t pgprot)
{
- return __pmd((((phys_addr_t)page_nr << PAGE_SHIFT) |
- pgprot_val(pgprot)) & __supported_pte_mask);
+ return __pmd(((phys_addr_t)page_nr << PAGE_SHIFT) |
+ massage_pgprot(pgprot));
}
static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
@@ -323,7 +337,7 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
* the newprot (if present):
*/
val &= _PAGE_CHG_MASK;
- val |= pgprot_val(newprot) & (~_PAGE_CHG_MASK) & __supported_pte_mask;
+ val |= massage_pgprot(newprot) & ~_PAGE_CHG_MASK;
return __pte(val);
}
@@ -339,7 +353,7 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot)
#define pte_pgprot(x) __pgprot(pte_flags(x) & PTE_FLAGS_MASK)
-#define canon_pgprot(p) __pgprot(pgprot_val(p) & __supported_pte_mask)
+#define canon_pgprot(p) __pgprot(massage_pgprot(p))
static inline int is_new_memtype_allowed(unsigned long flags,
unsigned long new_flags)