[sparc]: pte_file with constant number of bits.

arch/sparc/mm/srmmu.c

@@ -2199,8 +2199,6 @@ void __init ld_mmu_srmmu(void)
 	page_kernel = pgprot_val(SRMMU_PAGE_KERNEL);
 	pg_iobits = SRMMU_VALID | SRMMU_WRITE | SRMMU_REF;
 
-	BTFIXUPSET_SIMM13(pte_file_max_bits, SRMMU_PTE_FILE_MAX_BITS);
-
 	/* Functions */
 #ifndef CONFIG_SMP	
 	BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4md, BTFIXUPCALL_SWAPG1G2);

arch/sparc/mm/sun4c.c

@@ -1808,7 +1808,7 @@ static pte_t sun4c_pgoff_to_pte(unsigned long pgoff)
 
 static unsigned long sun4c_pte_to_pgoff(pte_t pte)
 {
-	return pte_val(pte) & ((1UL << SUN4C_PTE_FILE_MAX_BITS) - 1);
+	return pte_val(pte) & ((1UL << PTE_FILE_MAX_BITS) - 1);
 }
 
 
@@ -2127,8 +2127,6 @@ void __init ld_mmu_sun4c(void)
 	pg_iobits = _SUN4C_PAGE_PRESENT | _SUN4C_READABLE | _SUN4C_WRITEABLE |
 		    _SUN4C_PAGE_IO | _SUN4C_PAGE_NOCACHE;
 
-	BTFIXUPSET_SIMM13(pte_file_max_bits, SUN4C_PTE_FILE_MAX_BITS);
-
 	/* Functions */
 	BTFIXUPSET_CALL(___xchg32, ___xchg32_sun4c, BTFIXUPCALL_NORM);
 	BTFIXUPSET_CALL(do_check_pgt_cache, sun4c_check_pgt_cache, BTFIXUPCALL_NORM);

include/asm-sparc/pgtable.h

@@ -263,6 +263,8 @@ extern __inline__ int pte_file(pte_t pte)
 	return pte_val(pte) & BTFIXUP_HALF(pte_filei);
 }
 
+/*
+ */
 BTFIXUPDEF_HALF(pte_wrprotecti)
 BTFIXUPDEF_HALF(pte_mkcleani)
 BTFIXUPDEF_HALF(pte_mkoldi)
@@ -387,11 +389,15 @@ extern int invalid_segment;
 /* file-offset-in-pte helpers */
 BTFIXUPDEF_CALL(unsigned long, pte_to_pgoff, pte_t pte);
 BTFIXUPDEF_CALL(pte_t, pgoff_to_pte, unsigned long pgoff);
-BTFIXUPDEF_SIMM13(pte_file_max_bits);
 
 #define pte_to_pgoff(pte) BTFIXUP_CALL(pte_to_pgoff)(pte)
 #define pgoff_to_pte(off) BTFIXUP_CALL(pgoff_to_pte)(off)
-#define PTE_FILE_MAX_BITS BTFIXUP_SIMM13(pte_file_max_bits)
+
+/*
+ * This is made a constant because mm/fremap.c required a constant.
+ * Note that layout of these bits is different between sun4c.c and srmmu.c.
+ */
+#define PTE_FILE_MAX_BITS 24
 
 /*
  */

include/asm-sparc/pgtsrmmu.h

@@ -64,8 +64,7 @@
 
 #define SRMMU_FILE         0x40	/* Implemented in software */
 
-#define SRMMU_PTE_FILE_MAX_BITS	24
-#define SRMMU_PTE_FILE_SHIFT     8
+#define SRMMU_PTE_FILE_SHIFT     8	/* == 32-PTE_FILE_MAX_BITS */
 
 #define SRMMU_CHG_MASK    (0xffffff00 | SRMMU_REF | SRMMU_DIRTY)
 

include/asm-sparc/pgtsun4c.h

@@ -74,12 +74,6 @@
 #define SUN4C_PAGE_KERNEL	__pgprot(_SUN4C_READABLE|_SUN4C_WRITEABLE|\
 					 _SUN4C_PAGE_DIRTY|_SUN4C_PAGE_PRIV)
 
-/*
- * We have a couple of free bits left, but it's probably not a big
- * deal, considering sizes of RAM and swap on sun4c.
- */
-#define SUN4C_PTE_FILE_MAX_BITS	20
-
 #ifndef __ASSEMBLY__
 
 extern __inline__ unsigned long sun4c_get_synchronous_error(void)