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x86/cpu: Add INTEL_LUNARLAKE_M to X86_BUG_MONITOR #5236

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x86/cpu: Add INTEL_LUNARLAKE_M to X86_BUG_MONITOR #5236

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3 changes: 2 additions & 1 deletion arch/x86/kernel/cpu/intel.c
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Original file line number Diff line number Diff line change
Expand Up @@ -586,7 +586,8 @@ static void init_intel(struct cpuinfo_x86 *c)
c->x86_vfm == INTEL_WESTMERE_EX))
set_cpu_bug(c, X86_BUG_CLFLUSH_MONITOR);

if (boot_cpu_has(X86_FEATURE_MWAIT) && c->x86_vfm == INTEL_ATOM_GOLDMONT)
if (boot_cpu_has(X86_FEATURE_MWAIT) &&
(c->x86_vfm == INTEL_ATOM_GOLDMONT || c->x86_vfm == INTEL_LUNARLAKE_M))
set_cpu_bug(c, X86_BUG_MONITOR);

#ifdef CONFIG_X86_64
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3 changes: 3 additions & 0 deletions arch/x86/kernel/smpboot.c
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Original file line number Diff line number Diff line change
Expand Up @@ -1377,6 +1377,9 @@ void smp_kick_mwait_play_dead(void)
for (i = 0; READ_ONCE(md->status) != newstate && i < 1000; i++) {
/* Bring it out of mwait */
WRITE_ONCE(md->control, newstate);
/* If MONITOR unreliable, send IPI */
if (boot_cpu_has_bug(X86_BUG_MONITOR))
__apic_send_IPI(cpu, RESCHEDULE_VECTOR);
udelay(5);
}

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