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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-11-17 01:55:46 +0400
committerH. Peter Anvin <hpa@linux.intel.com>2012-11-17 04:42:09 +0400
commit7d74275d39def4d3ccc8cf4725388bf79ef13861 (patch)
treeafe6ed01aad5df44f82aa576151eeabd2e9b66b6 /arch/x86/include/asm/page_64.h
parent0bdf525f04afd3a32c14e5a8778771f9c9e0f074 (diff)
downloadlinux-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.h3
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)