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 dad718ce805c07304a461d2c75ca8b497bae9375..fa997dfaef242fa9abdb28c20658a939caf72697 100644 (file)
--- 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 @@ ENTRY(_copy_to_user)
        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 @@ ENTRY(_copy_from_user)
        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)