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Power management fix for 6.14-rc5

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Fix the handling of processors that stop the TSC in deeper C-states in
 the intel_idle driver (Thomas Gleixner).
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Merge tag 'pm-6.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "Fix the handling of processors that stop the TSC in deeper C-states in
  the intel_idle driver (Thomas Gleixner)"

* tag 'pm-6.14-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  intel_idle: Handle older CPUs, which stop the TSC in deeper C states, correctly
This commit is contained in:
Linus Torvalds 2025-02-28 17:40:27 -08:00
commit 14ebe69091
1 changed files with 4 additions and 0 deletions
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4
drivers/idle/intel_idle.c
View file

@ -56,6 +56,7 @@
#include <asm/intel-family.h>
#include <asm/mwait.h>
#include <asm/spec-ctrl.h>
#include <asm/tsc.h>
#include <asm/fpu/api.h>
#define INTEL_IDLE_VERSION "0.5.1"
@ -1799,6 +1800,9 @@ static void __init intel_idle_init_cstates_acpi(struct cpuidle_driver *drv)
if (intel_idle_state_needs_timer_stop(state))
state->flags |= CPUIDLE_FLAG_TIMER_STOP;
if (cx->type > ACPI_STATE_C1 && !boot_cpu_has(X86_FEATURE_NONSTOP_TSC))
mark_tsc_unstable("TSC halts in idle");
state->enter = intel_idle;
state->enter_s2idle = intel_idle_s2idle;
}