linux-kernel - [PATCH] x86/mce: Increase maximum number of banks to 64

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Message-Id: <20200820170624.1855825-1-Yazen.Ghannam@amd.com>
Date:   Thu, 20 Aug 2020 17:06:24 +0000
From:   Yazen Ghannam <Yazen.Ghannam@....com>
To:     linux-edac@...r.kernel.org
Cc:     Yazen Ghannam <Yazen.Ghannam@....com>,
        linux-kernel@...r.kernel.org, bp@...e.de, tony.luck@...el.com,
        x86@...nel.org, Smita.KoralahalliChannabasappa@....com
Subject: [PATCH] x86/mce: Increase maximum number of banks to 64

From: Akshay Gupta <Akshay.Gupta@....com>

...because future AMD systems will support up to 64 MCA banks per CPU.

MAX_NR_BANKS is used to allocate a number of data structures, and it is
used as a ceiling for values read from MCG_CAP[Count]. Therefore, this
change will have no functional effect on existing systems with 32 or
fewer MCA banks per CPU.

Signed-off-by: Akshay Gupta <Akshay.Gupta@....com>
[ Adjust commit message and code comment. ]
Signed-off-by: Yazen Ghannam <yazen.ghannam@....com>
---
 arch/x86/include/asm/mce.h | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/mce.h b/arch/x86/include/asm/mce.h
index 6adced6e7dd3..109af5c7f515 100644
--- a/arch/x86/include/asm/mce.h
+++ b/arch/x86/include/asm/mce.h
@@ -200,12 +200,8 @@ void mce_setup(struct mce *m);
 void mce_log(struct mce *m);
 DECLARE_PER_CPU(struct device *, mce_device);
 
-/*
- * Maximum banks number.
- * This is the limit of the current register layout on
- * Intel CPUs.
- */
-#define MAX_NR_BANKS 32
+/* Maximum number of MCA banks per CPU. */
+#define MAX_NR_BANKS 64
 
 #ifdef CONFIG_X86_MCE_INTEL
 void mce_intel_feature_init(struct cpuinfo_x86 *c);
-- 
2.25.1