Use the standard alternative_2_io() interface.

Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
---
 arch/x86/include/asm/msr.h | 13 +++++++------
 1 file changed, 7 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/msr.h b/arch/x86/include/asm/msr.h
index 001853541f1e..996e3b5857c6 100644
--- a/arch/x86/include/asm/msr.h
+++ b/arch/x86/include/asm/msr.h
@@ -214,12 +214,13 @@ static __always_inline unsigned long long rdtsc_ordered(void)
 	 * Thus, use the preferred barrier on the respective CPU, aiming for
 	 * RDTSCP as the default.
 	 */
-	asm volatile(ALTERNATIVE_2("rdtsc",
-				   "lfence; rdtsc", X86_FEATURE_LFENCE_RDTSC,
-				   "rdtscp", X86_FEATURE_RDTSCP)
-			: EAX_EDX_RET(val, low, high)
-			/* RDTSCP clobbers ECX with MSR_TSC_AUX. */
-			:: "ecx");
+	alternative_2_io("rdtsc",
+			 "lfence; rdtsc", X86_FEATURE_LFENCE_RDTSC,
+			 "rdtscp", X86_FEATURE_RDTSCP,
+			 ARG(EAX_EDX_RET(val, low, high)),
+			 ARG(),
+			 /* RDTSCP clobbers ECX with MSR_TSC_AUX. */
+			 ARG("ecx"));
 
 	return EAX_EDX_VAL(val, low, high);
 }
-- 
2.48.1