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[NOT FOR UPSTREAM] x86/cpu: Add INTEL_LUNARLAKE_M to X86_BUG_MONITOR
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Under some conditions, MONITOR wakeups on Lunar Lake processors
can be lost, resulting in significant user-visible delays.

Add LunarLake to X86_BUG_MONITOR so that wake_up_idle_cpu()
always sends an IPI, avoiding this potential delay.

Closes: https://bugzilla.kernel.org/show_bug.cgi?id=219364

Cc: [email protected] # 6.11
Signed-off-by: Len Brown <[email protected]>
Link: https://lore.kernel.org/lkml/a4aa8842a3c3bfdb7fe9807710eef159cbf0e705.1731463305.git.len.brown@intel.com/
Signed-off-by: Kai Vehmanen <[email protected]>
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lenb authored and ujfalusi committed Dec 4, 2024
1 parent 11fd5aa commit 81ce24b
Showing 1 changed file with 3 additions and 1 deletion.
4 changes: 3 additions & 1 deletion arch/x86/kernel/cpu/intel.c
Original file line number Diff line number Diff line change
Expand Up @@ -586,7 +586,9 @@ 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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