[PATCH 4.9 043/125] x86/speculation: Remove redundant arch_smt_update() invocation

[Greg Kroah-Hartman]

From: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>

commit 34d66caf251df91ff27b24a3a786810d29989eca upstream.

With commit a74cfffb03b7 ("x86/speculation: Rework SMT state change"),
arch_smt_update() is invoked from each individual CPU hotplug function.

Therefore the extra arch_smt_update() call in the sysfs SMT control is
redundant.

Fixes: a74cfffb03b7 ("x86/speculation: Rework SMT state change")
Signed-off-by: Zhenzhong Duan <zhenzhong.duan@xxxxxxxxxx>
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: <konrad.wilk@xxxxxxxxxx>
Cc: <dwmw@xxxxxxxxxxxx>
Cc: <bp@xxxxxxx>
Cc: <srinivas.eeda@xxxxxxxxxx>
Cc: <peterz@xxxxxxxxxxxxx>
Cc: <hpa@xxxxxxxxx>
Link: https://lkml.kernel.org/r/e2e064f2-e8ef-42ca-bf4f-76b612964752@default
Cc: Guenter Roeck <linux@xxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 kernel/cpu.c |    5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -2027,10 +2027,8 @@ int cpuhp_smt_disable(enum cpuhp_smt_con
 		 */
 		cpuhp_offline_cpu_device(cpu);
 	}
-	if (!ret) {
+	if (!ret)
 		cpu_smt_control = ctrlval;
-		arch_smt_update();
-	}
 	cpu_maps_update_done();
 	return ret;
 }
@@ -2041,7 +2039,6 @@ int cpuhp_smt_enable(void)
 
 	cpu_maps_update_begin();
 	cpu_smt_control = CPU_SMT_ENABLED;
-	arch_smt_update();
 	for_each_present_cpu(cpu) {
 		/* Skip online CPUs and CPUs on offline nodes */
 		if (cpu_online(cpu) || !node_online(cpu_to_node(cpu)))