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author | Jacob Shin <jacob.shin@amd.com> | 2012-11-16 19:38:48 -0800 |
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committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-17 11:59:09 -0800 |
commit | dda56e134059b840631fdfd034784056b627c2a6 (patch) | |
tree | f7369202429bc6204b0e5062426982265be0fb46 /arch/x86/include | |
parent | 4eea6aa581abfeb2695ebe9f9d4672597e1bdd4b (diff) | |
download | op-kernel-dev-dda56e134059b840631fdfd034784056b627c2a6.zip op-kernel-dev-dda56e134059b840631fdfd034784056b627c2a6.tar.gz |
x86, mm: Fixup code testing if a pfn is direct mapped
Update code that previously assumed pfns [ 0 - max_low_pfn_mapped ) and
[ 4GB - max_pfn_mapped ) were always direct mapped, to now look up
pfn_mapped ranges instead.
-v2: change applying sequence to keep git bisecting working.
so add dummy pfn_range_is_mapped(). - Yinghai Lu
Signed-off-by: Jacob Shin <jacob.shin@amd.com>
Link: http://lkml.kernel.org/r/1353123563-3103-12-git-send-email-yinghai@kernel.org
Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include')
-rw-r--r-- | arch/x86/include/asm/page_types.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/include/asm/page_types.h b/arch/x86/include/asm/page_types.h index e21fdd1..45aae6e 100644 --- a/arch/x86/include/asm/page_types.h +++ b/arch/x86/include/asm/page_types.h @@ -51,6 +51,14 @@ static inline phys_addr_t get_max_mapped(void) return (phys_addr_t)max_pfn_mapped << PAGE_SHIFT; } +static inline bool pfn_range_is_mapped(unsigned long start_pfn, + unsigned long end_pfn) +{ + return end_pfn <= max_low_pfn_mapped || + (end_pfn > (1UL << (32 - PAGE_SHIFT)) && + end_pfn <= max_pfn_mapped); +} + extern unsigned long init_memory_mapping(unsigned long start, unsigned long end); |