diff options
| author | Len Brown <len.brown@intel.com> | 2024-11-12 21:07:00 -0500 |
|---|---|---|
| committer | Dave Hansen <dave.hansen@linux.intel.com> | 2024-12-04 12:30:14 -0800 |
| commit | c9a4b55431e5220347881e148725bed69c84e037 (patch) | |
| tree | 9e661cb2ef7808cfaae8018f6f6ab065494b0a82 /arch/x86 | |
| parent | ae6012d72fa60c9ff92de5bac7a8021a47458e5b (diff) | |
| download | lwn-c9a4b55431e5220347881e148725bed69c84e037.tar.gz lwn-c9a4b55431e5220347881e148725bed69c84e037.zip | |
x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation
Under some conditions, MONITOR wakeups on Lunar Lake processors
can be lost, resulting in significant user-visible delays.
Add Lunar Lake to X86_BUG_MONITOR so that wake_up_idle_cpu()
always sends an IPI, avoiding this potential delay.
Reported originally here:
https://bugzilla.kernel.org/show_bug.cgi?id=219364
[ dhansen: tweak subject ]
Signed-off-by: Len Brown <len.brown@intel.com>
Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com>
Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc:stable@vger.kernel.org
Link: https://lore.kernel.org/all/a4aa8842a3c3bfdb7fe9807710eef159cbf0e705.1731463305.git.len.brown%40intel.com
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kernel/cpu/intel.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/arch/x86/kernel/cpu/intel.c b/arch/x86/kernel/cpu/intel.c index d1de300af173..8ded9f859a3a 100644 --- a/arch/x86/kernel/cpu/intel.c +++ b/arch/x86/kernel/cpu/intel.c @@ -555,7 +555,9 @@ 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 |