]> git.ipfire.org Git - thirdparty/kernel/stable.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)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Sat, 14 Dec 2024 19:03:31 +0000 (20:03 +0100)
commit9722010afd9c069d725f431fab2fd7bc8513d64e
tree6d9432191b4f04765c694a557f39a10c4295b354
parentd562b457e1c362f60d5c807a3a0775a9204a66a0
x86/cpu: Add Lunar Lake to list of CPUs with a broken MONITOR implementation

commit c9a4b55431e5220347881e148725bed69c84e037 upstream.

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
arch/x86/kernel/cpu/intel.c