x86: Make alternative instruction pointers relative

This save a few bytes on x86-64 and means that future patches can
apply alternatives to unrelocated code.

Signed-off-by: Andy Lutomirski <luto@mit.edu>
Link: http://lkml.kernel.org/r/ff64a6b9a1a3860ca4a7b8b6dc7b4754f9491cd7.1310563276.git.luto@mit.edu
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

2 files changed, 8 insertions, 12 deletions

diff --git a/arch/x86/lib/copy_page_64.S b/arch/x86/lib/copy_page_64.S
index 6fec2d1cebe1..01c805ba5359 100644
--- a/arch/x86/lib/copy_page_64.S
+++ b/arch/x86/lib/copy_page_64.S
@@ -2,6 +2,7 @@
 
 #include <linux/linkage.h>
 #include <asm/dwarf2.h>
+#include <asm/alternative-asm.h>
 
         ALIGN
 copy_page_c:
@@ -110,10 +111,6 @@ ENDPROC(copy_page)
 2:
         .previous
         .section .altinstructions,"a"
-        .align 8
-        .quad copy_page
-        .quad 1b
-        .word X86_FEATURE_REP_GOOD
-        .byte .Lcopy_page_end - copy_page
-        .byte 2b - 1b
+        altinstruction_entry copy_page, 1b, X86_FEATURE_REP_GOOD,       \
+                .Lcopy_page_end-copy_page, 2b-1b
         .previous
diff --git a/arch/x86/lib/memmove_64.S b/arch/x86/lib/memmove_64.S
index d0ec9c2936d7..ee164610ec46 100644
--- a/arch/x86/lib/memmove_64.S
+++ b/arch/x86/lib/memmove_64.S
@@ -9,6 +9,7 @@
 #include <linux/linkage.h>
 #include <asm/dwarf2.h>
 #include <asm/cpufeature.h>
+#include <asm/alternative-asm.h>
 
 #undef memmove
 
@@ -214,11 +215,9 @@ ENTRY(memmove)
         .previous
 
         .section .altinstructions,"a"
-        .align 8
-        .quad .Lmemmove_begin_forward
-        .quad .Lmemmove_begin_forward_efs
-        .word X86_FEATURE_ERMS
-        .byte .Lmemmove_end_forward-.Lmemmove_begin_forward
-        .byte .Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs
+        altinstruction_entry .Lmemmove_begin_forward,           \
+                .Lmemmove_begin_forward_efs,X86_FEATURE_ERMS,   \
+                .Lmemmove_end_forward-.Lmemmove_begin_forward,  \
+                .Lmemmove_end_forward_efs-.Lmemmove_begin_forward_efs
         .previous
 ENDPROC(memmove)