linux-kernel - Re: [PATCH 4/4] x86, mce: Have MCE persistent event off by default for now

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Date:	Tue, 3 May 2011 08:45:05 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Borislav Petkov <bp@...64.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	EDAC devel <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Borislav Petkov <borislav.petkov@....com>
Subject: Re: [PATCH 4/4] x86, mce: Have MCE persistent event off by default
 for now


* Borislav Petkov <bp@...64.org> wrote:

> From: Borislav Petkov <borislav.petkov@....com>
> 
> This is new functionality and it affects all of x86 so we want to be
> very conservative about it and have it off by default for now, in case
> something goes awry. You can always enable it by supplying "ras" on the
> kernel command line.
> 
> Also, depending on whether it is enabled or not, we emit the tracepoint
> from a different place in the code to pick up additional decoded info.
> 
> Signed-off-by: Borislav Petkov <borislav.petkov@....com>
> ---
>  Documentation/kernel-parameters.txt |    2 ++
>  arch/x86/include/asm/mce.h          |    1 +
>  arch/x86/kernel/cpu/mcheck/mce.c    |   32 ++++++++++++++++++++++++++++++--
>  drivers/edac/mce_amd.c              |    5 +++++
>  4 files changed, 38 insertions(+), 2 deletions(-)

the boot flag is fine - but please keep it enabled by default if MCE support is 
enabled in the .config, we do not chicken out when it comes to testing new 
code! :-)

Thanks,

	Ingo
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