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| author | Jeremy Fitzhardinge <jeremy@goop.org> | 2008-07-02 01:46:36 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-07-08 13:16:29 +0200 |
| commit | ef5e94af16c0c82452e1ea5d387e1203dd2198d6 (patch) | |
| tree | 7d80d1bba8a0c58e91995ead6f8b2cd6eddd314e /include | |
| parent | x86: always set _PAGE_GLOBAL in _PAGE_KERNEL* flags (diff) | |
| download | linux-ef5e94af16c0c82452e1ea5d387e1203dd2198d6.tar.xz linux-ef5e94af16c0c82452e1ea5d387e1203dd2198d6.zip | |
x86_32: remove __PAGE_KERNEL(_EXEC)
From: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Older x86-32 processors do not support global mappings (PGD), so must
only use it if the processor supports it.
The _PAGE_KERNEL* flags always have _PAGE_KERNEL set, since logically
we always want it set.
This is OK even on processors which do not support PGD, since all
_PAGE flags are masked with __supported_pte_mask before being turned
into a real in-pagetable pte. On 32-bit systems, __supported_pte_mask
is initialized to not contain _PAGE_GLOBAL, and it is then added if
the CPU is found to support it.
The x86-32 code used to use __PAGE_KERNEL/__PAGE_KERNEL_EXEC for this
purpose, but they're now redundant and can be removed.
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-x86/pgtable.h | 10 |
1 files changed, 0 insertions, 10 deletions
diff --git a/include/asm-x86/pgtable.h b/include/asm-x86/pgtable.h index a1c0009e81b7..64de07e25329 100644 --- a/include/asm-x86/pgtable.h +++ b/include/asm-x86/pgtable.h @@ -78,19 +78,9 @@ #define PAGE_READONLY_EXEC __pgprot(_PAGE_PRESENT | _PAGE_USER | \ _PAGE_ACCESSED) -#ifdef CONFIG_X86_32 -#define _PAGE_KERNEL_EXEC \ - (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED) -#define _PAGE_KERNEL (_PAGE_KERNEL_EXEC | _PAGE_NX) - -#ifndef __ASSEMBLY__ -extern pteval_t __PAGE_KERNEL, __PAGE_KERNEL_EXEC; -#endif /* __ASSEMBLY__ */ -#else #define __PAGE_KERNEL_EXEC \ (_PAGE_PRESENT | _PAGE_RW | _PAGE_DIRTY | _PAGE_ACCESSED | _PAGE_GLOBAL) #define __PAGE_KERNEL (__PAGE_KERNEL_EXEC | _PAGE_NX) -#endif #define __PAGE_KERNEL_RO (__PAGE_KERNEL & ~_PAGE_RW) #define __PAGE_KERNEL_RX (__PAGE_KERNEL_EXEC & ~_PAGE_RW) |