diff options
| author | Thomas Gleixner <tglx@linutronix.de> | 2024-02-28 23:20:32 +0100 |
|---|---|---|
| committer | Borislav Petkov (AMD) <bp@alien8.de> | 2024-03-04 17:39:24 +0100 |
| commit | 35ce64922c8263448e58a2b9e8d15a64e11e9b2d (patch) | |
| tree | 48f9c9e832c298fa03e74a9d56ee6c944065c89f /arch/x86/kernel/process.c | |
| parent | 5f75916ec6ecdc6314b637746f3ad809f2fc7379 (diff) | |
x86/idle: Select idle routine only once
The idle routine selection is done on every CPU bringup operation and
has a guard in place which is effective after the first invocation,
which is a pointless exercise.
Invoke it once on the boot CPU and mark the related functions __init.
The guard check has to stay as xen_set_default_idle() runs early.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/87edcu6vaq.ffs@tglx
Diffstat (limited to 'arch/x86/kernel/process.c')
| -rw-r--r-- | arch/x86/kernel/process.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/x86/kernel/process.c b/arch/x86/kernel/process.c index ccaacc7f9681..f0166b31a803 100644 --- a/arch/x86/kernel/process.c +++ b/arch/x86/kernel/process.c @@ -853,8 +853,9 @@ void __noreturn stop_this_cpu(void *dummy) * Do not prefer MWAIT if MONITOR instruction has a bug or idle=nomwait * is passed to kernel commandline parameter. */ -static bool prefer_mwait_c1_over_halt(const struct cpuinfo_x86 *c) +static __init bool prefer_mwait_c1_over_halt(void) { + const struct cpuinfo_x86 *c = &boot_cpu_data; u32 eax, ebx, ecx, edx; /* If override is enforced on the command line, fall back to HALT. */ @@ -908,7 +909,7 @@ static __cpuidle void mwait_idle(void) __current_clr_polling(); } -void select_idle_routine(const struct cpuinfo_x86 *c) +void __init select_idle_routine(void) { if (boot_option_idle_override == IDLE_POLL) { if (IS_ENABLED(CONFIG_SMP) && smp_num_siblings > 1) @@ -916,10 +917,11 @@ void select_idle_routine(const struct cpuinfo_x86 *c) return; } + /* Required to guard against xen_set_default_idle() */ if (x86_idle_set()) return; - if (prefer_mwait_c1_over_halt(c)) { + if (prefer_mwait_c1_over_halt()) { pr_info("using mwait in idle threads\n"); static_call_update(x86_idle, mwait_idle); } else if (cpu_feature_enabled(X86_FEATURE_TDX_GUEST)) { |