x86/alternative: Use ALTERNATIVE_TERNARY() in _static_cpu_has()

_static_cpu_has() contains a completely open coded version of
ALTERNATIVE_TERNARY(). Replace that with the macro instead.

Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210311142319.4723-8-jgross@suse.com

diff --git a/arch/x86/include/asm/cpufeature.h b/arch/x86/include/asm/cpufeature.h
index 1728d4ce5730b64fa475db780d9c483418d1aa43..16a51e7288d581805701cbd21aebb08c4c63441c 100644 (file)
--- a/arch/x86/include/asm/cpufeature.h
+++ b/arch/x86/include/asm/cpufeature.h
@@ -8,6 +8,7 @@
 
 #include <asm/asm.h>
 #include <linux/bitops.h>
+#include <asm/alternative.h>
 
 enum cpuid_leafs
 {
@@ -175,39 +176,15 @@ extern void clear_cpu_cap(struct cpuinfo_x86 *c, unsigned int bit);
  */
 static __always_inline bool _static_cpu_has(u16 bit)
 {
-       asm_volatile_goto("1: jmp 6f\n"
-                "2:\n"
-                ".skip -(((5f-4f) - (2b-1b)) > 0) * "
-                        "((5f-4f) - (2b-1b)),0x90\n"
-                "3:\n"
-                ".section .altinstructions,\"a\"\n"
-                " .long 1b - .\n"              /* src offset */
-                " .long 4f - .\n"              /* repl offset */
-                " .word %P[always]\n"          /* always replace */
-                " .byte 3b - 1b\n"             /* src len */
-                " .byte 5f - 4f\n"             /* repl len */
-                " .byte 3b - 2b\n"             /* pad len */
-                ".previous\n"
-                ".section .altinstr_replacement,\"ax\"\n"
-                "4: jmp %l[t_no]\n"
-                "5:\n"
-                ".previous\n"
-                ".section .altinstructions,\"a\"\n"
-                " .long 1b - .\n"              /* src offset */
-                " .long 0\n"                   /* no replacement */
-                " .word %P[feature]\n"         /* feature bit */
-                " .byte 3b - 1b\n"             /* src len */
-                " .byte 0\n"                   /* repl len */
-                " .byte 0\n"                   /* pad len */
-                ".previous\n"
-                ".section .altinstr_aux,\"ax\"\n"
-                "6:\n"
-                " testb %[bitnum],%[cap_byte]\n"
-                " jnz %l[t_yes]\n"
-                " jmp %l[t_no]\n"
-                ".previous\n"
+       asm_volatile_goto(
+               ALTERNATIVE_TERNARY("jmp 6f", %P[feature], "", "jmp %l[t_no]")
+               ".section .altinstr_aux,\"ax\"\n"
+               "6:\n"
+               " testb %[bitnum],%[cap_byte]\n"
+               " jnz %l[t_yes]\n"
+               " jmp %l[t_no]\n"
+               ".previous\n"
                 : : [feature]  "i" (bit),
-                    [always]   "i" (X86_FEATURE_ALWAYS),
                     [bitnum]   "i" (1 << (bit & 7)),
                     [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
                 : : t_yes, t_no);