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[PATCH] freepgt: remove arch pgd_addr_end

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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>
This commit is contained in:
Hugh Dickins 2005-04-19 13:29:17 -07:00 committed by Linus Torvalds
parent 3bf5ee9564
commit 8f6c99c11a
3 changed files with 3 additions and 46 deletions
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8
include/asm-generic/pgtable.h
View file

@ -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) \

26
include/asm-ia64/pgtable.h
View file

@ -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>

15
include/asm-sparc64/pgtable.h
View file

@ -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 */