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authorAlexander Duyck <alexander.h.duyck@intel.com>2012-11-16 13:55:46 -0800
committerH. Peter Anvin <hpa@linux.intel.com>2012-11-16 16:42:09 -0800
commit7d74275d39def4d3ccc8cf4725388bf79ef13861 (patch)
treeafe6ed01aad5df44f82aa576151eeabd2e9b66b6 /arch/x86/mm
parent0bdf525f04afd3a32c14e5a8778771f9c9e0f074 (diff)
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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/mm')
-rw-r--r--arch/x86/mm/physaddr.c11
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/x86/mm/physaddr.c b/arch/x86/mm/physaddr.c
index fd40d75..c73fedd 100644
--- a/arch/x86/mm/physaddr.c
+++ b/arch/x86/mm/physaddr.c
@@ -28,6 +28,17 @@ unsigned long __phys_addr(unsigned long x)
return x;
}
EXPORT_SYMBOL(__phys_addr);
+
+unsigned long __phys_addr_symbol(unsigned long x)
+{
+ unsigned long y = x - __START_KERNEL_map;
+
+ /* only check upper bounds since lower bounds will trigger carry */
+ VIRTUAL_BUG_ON(y >= KERNEL_IMAGE_SIZE);
+
+ return y + phys_base;
+}
+EXPORT_SYMBOL(__phys_addr_symbol);
#endif
bool __virt_addr_valid(unsigned long x)