mm: introduce pte_special pte bit

[cascardo/linux.git] / include / asm-mips / pgtable.h

diff --git a/include/asm-mips/pgtable.h b/include/asm-mips/pgtable.h
index 27d77d9..782221e 100644 (file)
--- a/include/asm-mips/pgtable.h
+++ b/include/asm-mips/pgtable.h
@@ -103,7 +103,7 @@ static inline void set_pte(pte_t *ptep, pte_t pte)
                }
        }
 }
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 
 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
@@ -140,7 +140,7 @@ static inline void set_pte(pte_t *ptep, pte_t pteval)
        }
 #endif
 }
-#define set_pte_at(mm,addr,ptep,pteval) set_pte(ptep,pteval)
+#define set_pte_at(mm, addr, ptep, pteval) set_pte(ptep, pteval)
 
 static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *ptep)
 {
@@ -168,19 +168,21 @@ static inline void pte_clear(struct mm_struct *mm, unsigned long addr, pte_t *pt
 #define set_pud(pudptr, pudval) do { *(pudptr) = (pudval); } while(0)
 #endif
 
-#define PGD_T_LOG2     ffz(~sizeof(pgd_t))
-#define PMD_T_LOG2     ffz(~sizeof(pmd_t))
-#define PTE_T_LOG2     ffz(~sizeof(pte_t))
+#define PGD_T_LOG2     (__builtin_ffs(sizeof(pgd_t)) - 1)
+#define PMD_T_LOG2     (__builtin_ffs(sizeof(pmd_t)) - 1)
+#define PTE_T_LOG2     (__builtin_ffs(sizeof(pte_t)) - 1)
 
-extern pgd_t swapper_pg_dir[PTRS_PER_PGD];
+/*
+ * We used to declare this array with size but gcc 3.3 and older are not able
+ * to find that this expression is a constant, so the size is dropped.
+ */
+extern pgd_t swapper_pg_dir[];
 
 /*
  * The following only work if pte_present() is true.
  * Undefined behaviour if not..
  */
-static inline int pte_user(pte_t pte)  { BUG(); return 0; }
 #if defined(CONFIG_64BIT_PHYS_ADDR) && defined(CONFIG_CPU_MIPS32_R1)
-static inline int pte_read(pte_t pte)  { return pte.pte_low & _PAGE_READ; }
 static inline int pte_write(pte_t pte) { return pte.pte_low & _PAGE_WRITE; }
 static inline int pte_dirty(pte_t pte) { return pte.pte_low & _PAGE_MODIFIED; }
 static inline int pte_young(pte_t pte) { return pte.pte_low & _PAGE_ACCESSED; }
@@ -193,13 +195,6 @@ static inline pte_t pte_wrprotect(pte_t pte)
        return pte;
 }
 
-static inline pte_t pte_rdprotect(pte_t pte)
-{
-       pte.pte_low  &= ~(_PAGE_READ | _PAGE_SILENT_READ);
-       pte.pte_high &= ~_PAGE_SILENT_READ;
-       return pte;
-}
-
 static inline pte_t pte_mkclean(pte_t pte)
 {
        pte.pte_low  &= ~(_PAGE_MODIFIED | _PAGE_SILENT_WRITE);
@@ -224,16 +219,6 @@ static inline pte_t pte_mkwrite(pte_t pte)
        return pte;
 }
 
-static inline pte_t pte_mkread(pte_t pte)
-{
-       pte.pte_low |= _PAGE_READ;
-       if (pte.pte_low & _PAGE_ACCESSED) {
-               pte.pte_low  |= _PAGE_SILENT_READ;
-               pte.pte_high |= _PAGE_SILENT_READ;
-       }
-       return pte;
-}
-
 static inline pte_t pte_mkdirty(pte_t pte)
 {
        pte.pte_low |= _PAGE_MODIFIED;
@@ -253,7 +238,6 @@ static inline pte_t pte_mkyoung(pte_t pte)
        return pte;
 }
 #else
-static inline int pte_read(pte_t pte)  { return pte_val(pte) & _PAGE_READ; }
 static inline int pte_write(pte_t pte) { return pte_val(pte) & _PAGE_WRITE; }
 static inline int pte_dirty(pte_t pte) { return pte_val(pte) & _PAGE_MODIFIED; }
 static inline int pte_young(pte_t pte) { return pte_val(pte) & _PAGE_ACCESSED; }
@@ -265,12 +249,6 @@ static inline pte_t pte_wrprotect(pte_t pte)
        return pte;
 }
 
-static inline pte_t pte_rdprotect(pte_t pte)
-{
-       pte_val(pte) &= ~(_PAGE_READ | _PAGE_SILENT_READ);
-       return pte;
-}
-
 static inline pte_t pte_mkclean(pte_t pte)
 {
        pte_val(pte) &= ~(_PAGE_MODIFIED|_PAGE_SILENT_WRITE);
@@ -291,14 +269,6 @@ static inline pte_t pte_mkwrite(pte_t pte)
        return pte;
 }
 
-static inline pte_t pte_mkread(pte_t pte)
-{
-       pte_val(pte) |= _PAGE_READ;
-       if (pte_val(pte) & _PAGE_ACCESSED)
-               pte_val(pte) |= _PAGE_SILENT_READ;
-       return pte;
-}
-
 static inline pte_t pte_mkdirty(pte_t pte)
 {
        pte_val(pte) |= _PAGE_MODIFIED;
@@ -315,6 +285,8 @@ static inline pte_t pte_mkyoung(pte_t pte)
        return pte;
 }
 #endif
+static inline int pte_special(pte_t pte)       { return 0; }
+static inline pte_t pte_mkspecial(pte_t pte)   { return pte; }
 
 /*
  * Macro to make mark a page protection value as "uncacheable".  Note