linux-kernel - [PATCH 1/2] x86/mce/amd: apply MC4_MISC thresholding to all models of family 15

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Date:   Wed, 16 Jan 2019 15:10:36 +0000
From:   "S, Shirish" <Shirish.S@....com>
To:     Borislav Petkov <bp@...en8.de>
CC:     Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H . Peter Anvin" <hpa@...or.com>,
        "maintainer : X86 ARCHITECTURE" <x86@...nel.org>,
        Tony Luck <tony.luck@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "open list : X86 ARCHITECTURE" <linux-kernel@...r.kernel.org>,
        "S, Shirish" <Shirish.S@....com>
Subject: [PATCH 1/2] x86/mce/amd: apply MC4_MISC thresholding to all models of
 family 15

Its evident from various forums and logs that MC4_MISC thresholding is not
supported for the family 15 processors, hence skip the x86_model check
while applying quirk.

Changelog[v2]:
 - reword commit message to adhere to coding standards
 - remove check of model range

Signed-off-by: Shirish S <shirish.s@....com>
---
 arch/x86/kernel/cpu/mce/core.c | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)

diff --git a/arch/x86/kernel/cpu/mce/core.c b/arch/x86/kernel/cpu/mce/core.c
index 672c722..d0c5416 100644
--- a/arch/x86/kernel/cpu/mce/core.c
+++ b/arch/x86/kernel/cpu/mce/core.c
@@ -1612,11 +1612,10 @@ 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;
-- 
2.7.4