ARM: pgtable: introduce pteval_t to represent a pte value

This makes everywhere dealing with pte values use the same type.
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/include/asm/page.h

@@ -151,13 +151,15 @@ extern void __cpu_copy_user_highpage(struct page *to, struct page *from,
 #define clear_page(page)	memset((void *)(page), 0, PAGE_SIZE)
 extern void copy_page(void *to, const void *from);
 
+typedef unsigned long pteval_t;
+
 #undef STRICT_MM_TYPECHECKS
 
 #ifdef STRICT_MM_TYPECHECKS
 /*
  * These are used to make use of C type-checking..
  */
-typedef struct { unsigned long pte; } pte_t;
+typedef struct { pteval_t pte; } pte_t;
 typedef struct { unsigned long pmd; } pmd_t;
 typedef struct { unsigned long pgd[2]; } pgd_t;
 typedef struct { unsigned long pgprot; } pgprot_t;
@@ -175,7 +177,7 @@ typedef struct { unsigned long pgprot; } pgprot_t;
 /*
  * .. while these make it easier on the compiler
  */
-typedef unsigned long pte_t;
+typedef pteval_t pte_t;
 typedef unsigned long pmd_t;
 typedef unsigned long pgd_t[2];
 typedef unsigned long pgprot_t;

arch/arm/include/asm/pgtable.h

@@ -10,6 +10,7 @@
 #ifndef _ASMARM_PGTABLE_H
 #define _ASMARM_PGTABLE_H
 
+#include <linux/const.h>
 #include <asm-generic/4level-fixup.h>
 #include <asm/proc-fns.h>
 
@@ -161,30 +162,30 @@ extern void __pgd_error(const char *file, int line, pgd_t);
  * The PTE table pointer refers to the hardware entries; the "Linux"
  * entries are stored 1024 bytes below.
  */
-#define L_PTE_PRESENT		(1 << 0)
-#define L_PTE_YOUNG		(1 << 1)
-#define L_PTE_FILE		(1 << 2)	/* only when !PRESENT */
-#define L_PTE_DIRTY		(1 << 6)
-#define L_PTE_WRITE		(1 << 7)
-#define L_PTE_USER		(1 << 8)
-#define L_PTE_EXEC		(1 << 9)
-#define L_PTE_SHARED		(1 << 10)	/* shared(v6), coherent(xsc3) */
+#define L_PTE_PRESENT		(_AT(pteval_t, 1) << 0)
+#define L_PTE_YOUNG		(_AT(pteval_t, 1) << 1)
+#define L_PTE_FILE		(_AT(pteval_t, 1) << 2)	/* only when !PRESENT */
+#define L_PTE_DIRTY		(_AT(pteval_t, 1) << 6)
+#define L_PTE_WRITE		(_AT(pteval_t, 1) << 7)
+#define L_PTE_USER		(_AT(pteval_t, 1) << 8)
+#define L_PTE_EXEC		(_AT(pteval_t, 1) << 9)
+#define L_PTE_SHARED		(_AT(pteval_t, 1) << 10)	/* shared(v6), coherent(xsc3) */
 
 /*
  * These are the memory types, defined to be compatible with
  * pre-ARMv6 CPUs cacheable and bufferable bits:   XXCB
  */
-#define L_PTE_MT_UNCACHED	(0x00 << 2)	/* 0000 */
-#define L_PTE_MT_BUFFERABLE	(0x01 << 2)	/* 0001 */
-#define L_PTE_MT_WRITETHROUGH	(0x02 << 2)	/* 0010 */
-#define L_PTE_MT_WRITEBACK	(0x03 << 2)	/* 0011 */
-#define L_PTE_MT_MINICACHE	(0x06 << 2)	/* 0110 (sa1100, xscale) */
-#define L_PTE_MT_WRITEALLOC	(0x07 << 2)	/* 0111 */
-#define L_PTE_MT_DEV_SHARED	(0x04 << 2)	/* 0100 */
-#define L_PTE_MT_DEV_NONSHARED	(0x0c << 2)	/* 1100 */
-#define L_PTE_MT_DEV_WC		(0x09 << 2)	/* 1001 */
-#define L_PTE_MT_DEV_CACHED	(0x0b << 2)	/* 1011 */
-#define L_PTE_MT_MASK		(0x0f << 2)
+#define L_PTE_MT_UNCACHED	(_AT(pteval_t, 0x00) << 2)	/* 0000 */
+#define L_PTE_MT_BUFFERABLE	(_AT(pteval_t, 0x01) << 2)	/* 0001 */
+#define L_PTE_MT_WRITETHROUGH	(_AT(pteval_t, 0x02) << 2)	/* 0010 */
+#define L_PTE_MT_WRITEBACK	(_AT(pteval_t, 0x03) << 2)	/* 0011 */
+#define L_PTE_MT_MINICACHE	(_AT(pteval_t, 0x06) << 2)	/* 0110 (sa1100, xscale) */
+#define L_PTE_MT_WRITEALLOC	(_AT(pteval_t, 0x07) << 2)	/* 0111 */
+#define L_PTE_MT_DEV_SHARED	(_AT(pteval_t, 0x04) << 2)	/* 0100 */
+#define L_PTE_MT_DEV_NONSHARED	(_AT(pteval_t, 0x0c) << 2)	/* 1100 */
+#define L_PTE_MT_DEV_WC		(_AT(pteval_t, 0x09) << 2)	/* 1001 */
+#define L_PTE_MT_DEV_CACHED	(_AT(pteval_t, 0x0b) << 2)	/* 1011 */
+#define L_PTE_MT_MASK		(_AT(pteval_t, 0x0f) << 2)
 
 #ifndef __ASSEMBLY__
 
@@ -405,7 +406,7 @@ static inline pte_t pte_mkspecial(pte_t pte) { return pte; }
 
 static inline pte_t pte_modify(pte_t pte, pgprot_t newprot)
 {
-	const unsigned long mask = L_PTE_EXEC | L_PTE_WRITE | L_PTE_USER;
+	const pteval_t mask = L_PTE_EXEC | L_PTE_WRITE | L_PTE_USER;
 	pte_val(pte) = (pte_val(pte) & ~mask) | (pgprot_val(newprot) & mask);
 	return pte;
 }

arch/arm/mm/fault-armv.c

@@ -26,7 +26,7 @@
 
 #include "mm.h"
 
-static unsigned long shared_pte_mask = L_PTE_MT_BUFFERABLE;
+static pteval_t shared_pte_mask = L_PTE_MT_BUFFERABLE;
 
 #if __LINUX_ARM_ARCH__ < 6
 /*

arch/arm/mm/mm.h

@@ -16,7 +16,7 @@ static inline pmd_t *pmd_off_k(unsigned long virt)
 }
 
 struct mem_type {
-	unsigned int prot_pte;
+	pteval_t prot_pte;
 	unsigned int prot_l1;
 	unsigned int prot_sect;
 	unsigned int domain;

arch/arm/mm/mmu.c

@@ -62,7 +62,7 @@ struct cachepolicy {
 	const char	policy[16];
 	unsigned int	cr_mask;
 	unsigned int	pmd;
-	unsigned int	pte;
+	pteval_t	pte;
 };
 
 static struct cachepolicy cache_policies[] __initdata = {