]> www.infradead.org Git - users/dwmw2/linux.git/commit
x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation
authorLen Brown <len.brown@intel.com>
Wed, 13 Nov 2024 02:07:00 +0000 (21:07 -0500)
committerDave Hansen <dave.hansen@linux.intel.com>
Wed, 4 Dec 2024 20:30:14 +0000 (12:30 -0800)
commitc9a4b55431e5220347881e148725bed69c84e037
tree9e661cb2ef7808cfaae8018f6f6ab065494b0a82
parentae6012d72fa60c9ff92de5bac7a8021a47458e5b
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
arch/x86/kernel/cpu/intel.c