[PATCH 3.16 096/131] x86: mm: Add PUD functions

[Ben Hutchings]

3.16.59-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Ben Hutchings <b...@decadent.org.uk>

These are extracted from commit a00cc7d9dd93 "mm, x86: add support for
PUD-sized transparent hugepages" and will be used by later patches.

Signed-off-by: Ben Hutchings <b...@decadent.org.uk>
---

--- a/arch/x86/include/asm/pgtable.h
+++ b/arch/x86/include/asm/pgtable.h
@@ -303,6 +303,25 @@ static inline pmd_t pmd_mknotpresent(pmd
        return pmd_clear_flags(pmd, _PAGE_PRESENT);
 }
 
+static inline pud_t pud_set_flags(pud_t pud, pudval_t set)
+{
+       pudval_t v = native_pud_val(pud);
+
+       return __pud(v | set);
+}
+
+static inline pud_t pud_clear_flags(pud_t pud, pudval_t clear)
+{
+       pudval_t v = native_pud_val(pud);
+
+       return __pud(v & ~clear);
+}
+
+static inline pud_t pud_mkhuge(pud_t pud)
+{
+       return pud_set_flags(pud, _PAGE_PSE);
+}
+
 #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY
 static inline int pte_soft_dirty(pte_t pte)
 {
@@ -352,6 +371,12 @@ static inline pmd_t pfn_pmd(unsigned lon
                     massage_pgprot(pgprot));
 }
 
+static inline pud_t pfn_pud(unsigned long page_nr, pgprot_t pgprot)
+{
+       return __pud(((phys_addr_t)page_nr << PAGE_SHIFT) |
+                    massage_pgprot(pgprot));
+}
+
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
        pteval_t val = pte_val(pte);