[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: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 3 insertions, 5 deletions

diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h
index a3b28710d56c..1f4ec7b70270 100644
--- a/include/asm-generic/pgtable.h
+++ b/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)                                         \