From a430c11f401589a0f4f57fd398271a5d85142c7a Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Thu, 5 Jun 2025 17:06:08 +0200 Subject: [PATCH] intel_idle: Rescan "dead" SMT siblings during initialization Make intel_idle_init() call arch_cpu_rescan_dead_smt_siblings() after successfully registering intel_idle as the cpuidle driver so as to allow the "dead" SMT siblings (if any) to go into deep idle states. This is necessary for the processor to be able to reach deep package C-states (like PC10) going forward which is requisite for reducing power sufficiently in suspend-to-idle, among other things. Signed-off-by: Rafael J. Wysocki Tested-by: Artem Bityutskiy Link: https://patch.msgid.link/10669885.nUPlyArG6x@rjwysocki.net --- drivers/idle/intel_idle.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/idle/intel_idle.c b/drivers/idle/intel_idle.c index 64ac4da08094..63565814c7e5 100644 --- a/drivers/idle/intel_idle.c +++ b/drivers/idle/intel_idle.c @@ -2507,6 +2507,8 @@ static int __init intel_idle_init(void) pr_debug("Local APIC timer is reliable in %s\n", boot_cpu_has(X86_FEATURE_ARAT) ? "all C-states" : "C1"); + arch_cpu_rescan_dead_smt_siblings(); + return 0; hp_setup_fail: -- 2.25.1