ARC: mm: Introduce PTE_SPECIAL

Needed for THP, but will also come in handy for fast GUP later

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

diff --git a/arch/arc/include/asm/pgtable.h b/arch/arc/include/asm/pgtable.h
index 481359f..431a833 100644 (file)
--- a/arch/arc/include/asm/pgtable.h
+++ b/arch/arc/include/asm/pgtable.h
@@ -61,6 +61,7 @@
 #define _PAGE_WRITE         (1<<4)     /* Page has user write perm (H) */
 #define _PAGE_READ          (1<<5)     /* Page has user read perm (H) */
 #define _PAGE_DIRTY         (1<<6)     /* Page modified (dirty) (S) */
+#define _PAGE_SPECIAL       (1<<7)
 #define _PAGE_GLOBAL        (1<<8)     /* Page is global (H) */
 #define _PAGE_PRESENT       (1<<10)    /* TLB entry is valid (H) */
 
@@ -72,6 +73,7 @@
 #define _PAGE_READ          (1<<3)     /* Page has user read perm (H) */
 #define _PAGE_ACCESSED      (1<<4)     /* Page is accessed (S) */
 #define _PAGE_DIRTY         (1<<5)     /* Page modified (dirty) (S) */
+#define _PAGE_SPECIAL       (1<<6)
 
 #if (CONFIG_ARC_MMU_VER >= 4)
 #define _PAGE_WTHRU         (1<<7)     /* Page cache mode write-thru (H) */
@@ -292,7 +294,7 @@ static inline void pmd_set(pmd_t *pmdp, pte_t *ptep)
 #define pte_write(pte)         (pte_val(pte) & _PAGE_WRITE)
 #define pte_dirty(pte)         (pte_val(pte) & _PAGE_DIRTY)
 #define pte_young(pte)         (pte_val(pte) & _PAGE_ACCESSED)
-#define pte_special(pte)       (0)
+#define pte_special(pte)       (pte_val(pte) & _PAGE_SPECIAL)
 
 #define PTE_BIT_FUNC(fn, op) \
        static inline pte_t pte_##fn(pte_t pte) { pte_val(pte) op; return pte; }
@@ -305,8 +307,9 @@ PTE_BIT_FUNC(mkold, &= ~(_PAGE_ACCESSED));
 PTE_BIT_FUNC(mkyoung,  |= (_PAGE_ACCESSED));
 PTE_BIT_FUNC(exprotect,        &= ~(_PAGE_EXECUTE));
 PTE_BIT_FUNC(mkexec,   |= (_PAGE_EXECUTE));
+PTE_BIT_FUNC(mkspecial,        |= (_PAGE_SPECIAL));
 
-static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
+#define __HAVE_ARCH_PTE_SPECIAL
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {