x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation

JIRA: https://issues.redhat.com/browse/RHEL-68394

commit c9a4b55
Author: Len Brown <len.brown@intel.com>
Date:   Tue Nov 12 21:07:00 2024 -0500

    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

Signed-off-by: David Arcari <darcari@redhat.com>

Author: darcari

arch/x86/kernel/cpu/intel.c

@@ -631,7 +631,9 @@ 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