Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ieee13...

[powerpc.git] / include / asm-i386 / pgtable-3level.h

diff --git a/include/asm-i386/pgtable-3level.h b/include/asm-i386/pgtable-3level.h
index 36a5aa6..c2d701e 100644 (file)
--- a/include/asm-i386/pgtable-3level.h
+++ b/include/asm-i386/pgtable-3level.h
@@ -58,7 +58,21 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
 }
 #define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
 
-#define __HAVE_ARCH_SET_PTE_ATOMIC
+/*
+ * Since this is only called on user PTEs, and the page fault handler
+ * must handle the already racy situation of simultaneous page faults,
+ * we are justified in merely clearing the PTE present bit, followed
+ * by a set.  The ordering here is important.
+ */
+static inline void set_pte_present(struct mm_struct *mm, unsigned long addr, pte_t *ptep, pte_t pte)
+{
+       ptep->pte_low = 0;
+       smp_wmb();
+       ptep->pte_high = pte.pte_high;
+       smp_wmb();
+       ptep->pte_low = pte.pte_low;
+}
+
 #define set_pte_atomic(pteptr,pteval) \
                set_64bit((unsigned long long *)(pteptr),pte_val(pteval))
 #define set_pmd(pmdptr,pmdval) \
@@ -77,7 +91,7 @@ static inline void pud_clear (pud_t * pud) { }
 #define pud_page(pud) \
 ((struct page *) __va(pud_val(pud) & PAGE_MASK))
 
-#define pud_page_kernel(pud) \
+#define pud_page_vaddr(pud) \
 ((unsigned long) __va(pud_val(pud) & PAGE_MASK))
 
 
@@ -85,6 +99,27 @@ static inline void pud_clear (pud_t * pud) { }
 #define pmd_offset(pud, address) ((pmd_t *) pud_page(*(pud)) + \
                        pmd_index(address))
 
+/*
+ * For PTEs and PDEs, we must clear the P-bit first when clearing a page table
+ * entry, so clear the bottom half first and enforce ordering with a compiler
+ * barrier.
+ */
+static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
+{
+       ptep->pte_low = 0;
+       smp_wmb();
+       ptep->pte_high = 0;
+}
+
+static inline void pmd_clear(pmd_t *pmd)
+{
+       u32 *tmp = (u32 *)pmd;
+       *tmp = 0;
+       smp_wmb();
+       *(tmp + 1) = 0;
+}
+
+#define __HAVE_ARCH_PTEP_GET_AND_CLEAR
 static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
        pte_t res;
@@ -97,6 +132,7 @@ static inline pte_t ptep_get_and_clear(struct mm_struct *mm, unsigned long addr,
        return res;
 }
 
+#define __HAVE_ARCH_PTE_SAME
 static inline int pte_same(pte_t a, pte_t b)
 {
        return a.pte_low == b.pte_low && a.pte_high == b.pte_high;