linux-kernel - [080/156] edac, mce: Filter out invalid values

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Message-Id: <20100330224812.096158303@linux.site>
Date:	Tue, 30 Mar 2010 15:41:54 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	Borislav Petkov <borislav.petkov@....com>,
	Greg Kroah-Hartman <gregkh@...e.de>
Subject: [080/156] edac, mce: Filter out invalid values

2.6.33-stable review patch.  If anyone has any objections, please let us know.

------------------

From: Borislav Petkov <borislav.petkov@....com>

commit 5b89d2f9ace1970324facc68ca9b8fae19ce8096 upstream.

Print the CPU associated with the error only when the field is valid.

Signed-off-by: Borislav Petkov <borislav.petkov@....com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/edac/edac_mce_amd.c |    7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

--- a/drivers/edac/edac_mce_amd.c
+++ b/drivers/edac/edac_mce_amd.c
@@ -316,7 +316,12 @@ void amd_decode_nb_mce(int node_id, stru
 		if (regs->nbsh & K8_NBSH_ERR_CPU_VAL)
 			pr_cont(", core: %u\n", (u8)(regs->nbsh & 0xf));
 	} else {
-		pr_cont(", core: %d\n", fls((regs->nbsh & 0xf) - 1));
+		u8 assoc_cpus = regs->nbsh & 0xf;
+
+		if (assoc_cpus > 0)
+			pr_cont(", core: %d", fls(assoc_cpus) - 1);
+
+		pr_cont("\n");
 	}
 
 	pr_emerg("%s.\n", EXT_ERR_MSG(xec));


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