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Date:   Mon, 16 Jan 2017 16:49:41 -0500
From:   Prarit Bhargava <>
Cc:     Prarit Bhargava <>,
        Tony Luck <>,
        Borislav Petkov <>,
        Thomas Gleixner <>,
        Ingo Molnar <>,
        "H. Peter Anvin" <>,,
Subject: [PATCH] x86/mce: Fix initialization error warning

When booting kernel with mce=off a loud warning from the mce code
is displayed.  This causes confusion for end users.

Add a check to see if MCE is available before outputting the warning

Signed-off-by: Prarit Bhargava <>
Cc: Tony Luck <>
Cc: Borislav Petkov <>
Cc: Thomas Gleixner <>
Cc: Ingo Molnar <>
Cc: "H. Peter Anvin" <>
 arch/x86/kernel/cpu/mcheck/mce.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index 00ef43233e03..943a0c440c55 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -2662,7 +2662,8 @@ static __init int mcheck_init_device(void)
-	pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err);
+	if (mce_available(&boot_cpu_data))
+		pr_err("Unable to init device /dev/mcelog (rc: %d)\n", err);
 	return err;

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