[B/C] [PATCH 1/4] x86/MCE/AMD: Turn off MC4_MISC thresholding on all family 0x15 models

Kai-Heng Feng kai.heng.feng at canonical.com
Wed Jul 3 07:23:03 UTC 2019

From: Shirish S <Shirish.S at amd.com>

BugLink: https://bugs.launchpad.net/bugs/1796443

MC4_MISC thresholding is not supported on all family 0x15 processors,
hence skip the x86_model check when applying the quirk.

 [ bp: massage commit message. ]

Signed-off-by: Shirish S <shirish.s at amd.com>
Signed-off-by: Borislav Petkov <bp at suse.de>
Cc: "H. Peter Anvin" <hpa at zytor.com>
Cc: Ingo Molnar <mingo at redhat.com>
Cc: Thomas Gleixner <tglx at linutronix.de>
Cc: Tony Luck <tony.luck at intel.com>
Cc: Vishal Verma <vishal.l.verma at intel.com>
Cc: x86-ml <x86 at kernel.org>
Link: https://lkml.kernel.org/r/1547106849-3476-2-git-send-email-shirish.s@amd.com
(backported from commit c95b323dcd3598dd7ef5005d6723c1ba3b801093)
Signed-off-by: Kai-Heng Feng <kai.heng.feng at canonical.com>
 arch/x86/kernel/cpu/mcheck/mce.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index d355751c8038..7ee9cb37d7c9 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -1599,11 +1599,10 @@ static int __mcheck_cpu_apply_quirks(struct cpuinfo_x86 *c)
 			mce_flags.overflow_recov = 1;
-		 * Turn off MC4_MISC thresholding banks on those models since
+		 * Turn off MC4_MISC thresholding banks on all models since
 		 * they're not supported there.
-		if (c->x86 == 0x15 &&
-		    (c->x86_model >= 0x10 && c->x86_model <= 0x1f)) {
+		if (c->x86 == 0x15) {
 			int i;
 			u64 hwcr;
 			bool need_toggle;

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