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| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2012-11-17 01:55:46 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-17 04:42:09 +0400 |
| commit | 7d74275d39def4d3ccc8cf4725388bf79ef13861 (patch) | |
| tree | afe6ed01aad5df44f82aa576151eeabd2e9b66b6 /arch/x86/include/asm/page_64.h | |
| parent | 0bdf525f04afd3a32c14e5a8778771f9c9e0f074 (diff) | |
| download | linux-7d74275d39def4d3ccc8cf4725388bf79ef13861.tar.xz | |
x86: Make it so that __pa_symbol can only process kernel symbols on x86_64
I submitted an earlier patch that make __phys_addr an inline. This obviously
results in an increase in the code size. One step I can take to reduce that
is to make it so that the __pa_symbol call does a direct translation for
kernel addresses instead of covering all of virtual memory.
On my system this reduced the size for __pa_symbol from 5 instructions
totalling 30 bytes to 3 instructions totalling 16 bytes.
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Link: http://lkml.kernel.org/r/20121116215356.8521.92472.stgit@ahduyck-cp1.jf.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/page_64.h')
| -rw-r--r-- | arch/x86/include/asm/page_64.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/x86/include/asm/page_64.h b/arch/x86/include/asm/page_64.h index 5138174c2101..0f1ddee6a0ce 100644 --- a/arch/x86/include/asm/page_64.h +++ b/arch/x86/include/asm/page_64.h @@ -21,8 +21,11 @@ static inline unsigned long __phys_addr_nodebug(unsigned long x) #ifdef CONFIG_DEBUG_VIRTUAL extern unsigned long __phys_addr(unsigned long); +extern unsigned long __phys_addr_symbol(unsigned long); #else #define __phys_addr(x) __phys_addr_nodebug(x) +#define __phys_addr_symbol(x) \ + ((unsigned long)(x) - __START_KERNEL_map + phys_base) #endif #define __phys_reloc_hide(x) (x) |