From: Zhenzhong Duan zhenzhong.duan@oracle.com
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@oracle.com Signed-off-by: Thomas Gleixner tglx@linutronix.de Cc: konrad.wilk@oracle.com Cc: dwmw@amazon.co.uk Cc: bp@suse.de Cc: srinivas.eeda@oracle.com Cc: peterz@infradead.org Cc: hpa@zytor.com Link: https://lkml.kernel.org/r/e2e064f2-e8ef-42ca-bf4f-76b612964752@default Cc: Guenter Roeck linux@roeck-us.net Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- 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)))