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Commit 8f6c99c1 authored by Hugh Dickins's avatar Hugh Dickins Committed by Linus Torvalds
Browse files

[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: default avatarHugh Dickins <hugh@veritas.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 3bf5ee95

include/asm-generic/pgtable.h

+3 −5
Original line number Diff line number Diff line
@@ -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

+0 −26
Original line number Diff line number Diff line
@@ -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

+0 −15
Original line number Diff line number Diff line
@@ -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 */