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x86, pat: Generalize the use of page flag PG_uncached

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Only IA64 was using PG_uncached as of now. We now intend to use this bit
in x86 as well, to keep track of memory type of those addresses that
have page struct for them. So, generalize the use of that bit across
ia64 and x86.

Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Venkatesh Pallipadi 2009-07-10 09:57:37 -07:00 committed by H. Peter Anvin
parent 335ef896d4
commit 46cf98cdae
3 changed files with 10 additions and 2 deletions
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4
arch/ia64/Kconfig
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@ -112,6 +112,10 @@ config IA64_UNCACHED_ALLOCATOR
bool bool
select GENERIC_ALLOCATOR select GENERIC_ALLOCATOR
config ARCH_USES_PG_UNCACHED
def_bool y
depends on IA64_UNCACHED_ALLOCATOR
config AUDIT_ARCH config AUDIT_ARCH
bool bool
default y default y

4
arch/x86/Kconfig
View File

@ -1414,6 +1414,10 @@ config X86_PAT
If unsure, say Y. If unsure, say Y.
config ARCH_USES_PG_UNCACHED
def_bool y
depends on X86_PAT
config EFI config EFI
bool "EFI runtime service support" bool "EFI runtime service support"
depends on ACPI depends on ACPI

4
include/linux/page-flags.h
View File

@ -99,7 +99,7 @@ enum pageflags {
#ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT #ifdef CONFIG_HAVE_MLOCKED_PAGE_BIT
PG_mlocked, /* Page is vma mlocked */ PG_mlocked, /* Page is vma mlocked */
#endif #endif
#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR #ifdef CONFIG_ARCH_USES_PG_UNCACHED
PG_uncached, /* Page has been mapped as uncached */ PG_uncached, /* Page has been mapped as uncached */
#endif #endif
__NR_PAGEFLAGS, __NR_PAGEFLAGS,
@ -257,7 +257,7 @@ PAGEFLAG_FALSE(Mlocked)
SETPAGEFLAG_NOOP(Mlocked) TESTCLEARFLAG_FALSE(Mlocked) SETPAGEFLAG_NOOP(Mlocked) TESTCLEARFLAG_FALSE(Mlocked)
#endif #endif
#ifdef CONFIG_IA64_UNCACHED_ALLOCATOR #ifdef CONFIG_ARCH_USES_PG_UNCACHED
PAGEFLAG(Uncached, uncached) PAGEFLAG(Uncached, uncached)
#else #else
PAGEFLAG_FALSE(Uncached) PAGEFLAG_FALSE(Uncached)