[PATCH] freepgt: remove arch pgd_addr_end

ia64 and sparc64 hurriedly had to introduce their own variants of
pgd_addr_end, to leapfrog over the holes in their virtual address spaces which
the final clear_page_range suddenly presented when converted from pgd_index to
pgd_addr_end.  But now that free_pgtables respects the vma list, those holes
are never presented, and the arch variants can go.
Signed-off-by: NHugh Dickins <hugh@veritas.com>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

include/asm-generic/pgtable.h

@@ -140,17 +140,15 @@ static inline void ptep_set_wrprotect(struct mm_struct *mm, unsigned long addres
 #endif
 
 /*
- * When walking page tables, get the address of the next boundary, or
- * the end address of the range if that comes earlier.  Although end might
- * wrap to 0 only in clear_page_range, __boundary may wrap to 0 throughout.
+ * When walking page tables, get the address of the next boundary,
+ * or the end address of the range if that comes earlier.  Although no
+ * vma end wraps to 0, rounded up __boundary may wrap to 0 throughout.
  */
 
-#ifndef pgd_addr_end
 #define pgd_addr_end(addr, end)						\
 ({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
 	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
 })
-#endif
 
 #ifndef pud_addr_end
 #define pud_addr_end(addr, end)						\

include/asm-ia64/pgtable.h

@@ -561,32 +561,6 @@ do {											\
 #define __HAVE_ARCH_PGD_OFFSET_GATE
 #define __HAVE_ARCH_LAZY_MMU_PROT_UPDATE
 
-/*
- * Override for pgd_addr_end() to deal with the virtual address space holes
- * in each region.  In regions 0..4 virtual address bits are used like this:
- *      +--------+------+--------+-----+-----+--------+
- *      | pgdhi3 | rsvd | pgdlow | pmd | pte | offset |
- *      +--------+------+--------+-----+-----+--------+
- *  'pgdlow' overflows to pgdhi3 (a.k.a. region bits) leaving rsvd==0
- */
-#define IA64_PGD_OVERFLOW (PGDIR_SIZE << (PAGE_SHIFT-6))
-
-#define pgd_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
- 	if (REGION_NUMBER(__boundary) < 5 && 				\
-	    __boundary & IA64_PGD_OVERFLOW)				\
-		__boundary += (RGN_SIZE - 1) & ~(IA64_PGD_OVERFLOW - 1);\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-
-#define pmd_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK;	\
- 	if (REGION_NUMBER(__boundary) < 5 &&				\
-	    __boundary & IA64_PGD_OVERFLOW)				\
-		__boundary += (RGN_SIZE - 1) & ~(IA64_PGD_OVERFLOW - 1);\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-
 #include <asm-generic/pgtable-nopud.h>
 #include <asm-generic/pgtable.h>
 

include/asm-sparc64/pgtable.h

@@ -424,21 +424,6 @@ extern int io_remap_pfn_range(struct vm_area_struct *vma, unsigned long from,
 #define GET_IOSPACE(pfn)		(pfn >> (BITS_PER_LONG - 4))
 #define GET_PFN(pfn)			(pfn & 0x0fffffffffffffffUL)
 
-/* Override for {pgd,pmd}_addr_end() to deal with the virtual address
- * space hole.  We simply sign extend bit 43.
- */
-#define pgd_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PGDIR_SIZE) & PGDIR_MASK;	\
-	__boundary = ((long) (__boundary << 20)) >> 20;			\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-
-#define pmd_addr_end(addr, end)						\
-({	unsigned long __boundary = ((addr) + PMD_SIZE) & PMD_MASK;	\
-	__boundary = ((long) (__boundary << 20)) >> 20;			\
-	(__boundary - 1 < (end) - 1)? __boundary: (end);		\
-})
-
 #include <asm-generic/pgtable.h>
 
 /* We provide our own get_unmapped_area to cope with VA holes for userland */