x86/lib/copy_user_64.S: Convert to ALTERNATIVE_2
Use the asm macro and drop the locally grown version.
Signed-off-by: Borislav Petkov <bp@suse.de>
diff --git a/arch/x86/lib/copy_user_64.S b/arch/x86/lib/copy_user_64.S
index dad718c..fa997df 100644
--- a/arch/x86/lib/copy_user_64.S
+++ b/arch/x86/lib/copy_user_64.S
@@ -16,30 +16,6 @@
#include <asm/asm.h>
#include <asm/smap.h>
-/*
- * By placing feature2 after feature1 in altinstructions section, we logically
- * implement:
- * If CPU has feature2, jmp to alt2 is used
- * else if CPU has feature1, jmp to alt1 is used
- * else jmp to orig is used.
- */
- .macro ALTERNATIVE_JUMP feature1,feature2,orig,alt1,alt2
-0:
- jmp \orig
-1:
- .section .altinstr_replacement,"ax"
-2:
- jmp \alt1
-3:
- jmp \alt2
- .previous
-
- .section .altinstructions,"a"
- altinstruction_entry 0b,2b,\feature1,5,5,0
- altinstruction_entry 0b,3b,\feature2,5,5,0
- .previous
- .endm
-
.macro ALIGN_DESTINATION
/* check for bad alignment of destination */
movl %edi,%ecx
@@ -73,9 +49,11 @@
jc bad_to_user
cmpq TI_addr_limit(%rax),%rcx
ja bad_to_user
- ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,X86_FEATURE_ERMS, \
- copy_user_generic_unrolled,copy_user_generic_string, \
- copy_user_enhanced_fast_string
+ ALTERNATIVE_2 "jmp copy_user_generic_unrolled", \
+ "jmp copy_user_generic_string", \
+ X86_FEATURE_REP_GOOD, \
+ "jmp copy_user_enhanced_fast_string", \
+ X86_FEATURE_ERMS
CFI_ENDPROC
ENDPROC(_copy_to_user)
@@ -88,9 +66,11 @@
jc bad_from_user
cmpq TI_addr_limit(%rax),%rcx
ja bad_from_user
- ALTERNATIVE_JUMP X86_FEATURE_REP_GOOD,X86_FEATURE_ERMS, \
- copy_user_generic_unrolled,copy_user_generic_string, \
- copy_user_enhanced_fast_string
+ ALTERNATIVE_2 "jmp copy_user_generic_unrolled", \
+ "jmp copy_user_generic_string", \
+ X86_FEATURE_REP_GOOD, \
+ "jmp copy_user_enhanced_fast_string", \
+ X86_FEATURE_ERMS
CFI_ENDPROC
ENDPROC(_copy_from_user)