linux-kernel - [PATCH] x86, mce: Always fall into mcelog path, regardless of what notifiers returned

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Date:	Fri, 30 Jan 2015 09:29:47 -0800
From:	Tony Luck <tony.luck@...el.com>
To:	linux-kernel@...r.kernel.org, linux-edac@...r.kernel.org
Cc:	Borislav Petkov <bp@...e.de>, Chen Gong <gong.chen@...ux.intel.com>
Subject: [PATCH] x86, mce: Always fall into mcelog path, regardless of what notifiers returned

This has been broken for a while - but we should not allow code
registered on the x86_mce_decoder_chain to bypass sending machine
check logs to /dev/mcelog.

Signed-off-by: Tony Luck <tony.luck@...el.com>
---

Yes, we've had this conversation before and I wimped out and didn't
push the issue. But userspace is broken. People are complaining to
me that errors don't show up in /var/log/mcelog even though they
started the mcelog(8) daemon.

 arch/x86/kernel/cpu/mcheck/mce.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index d2c611699cd9..f439c429c133 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -150,14 +150,11 @@ static struct mce_log mcelog = {
 void mce_log(struct mce *mce)
 {
 	unsigned next, entry;
-	int ret = 0;
 
 	/* Emit the trace record: */
 	trace_mce_record(mce);
 
-	ret = atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, mce);
-	if (ret == NOTIFY_STOP)
-		return;
+	atomic_notifier_call_chain(&x86_mce_decoder_chain, 0, mce);
 
 	mce->finished = 0;
 	wmb();
-- 
2.1.0

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