linux-kernel - Re: [PATCH] RAS/CEC: Add debugfs switch to disable at run time

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Message-ID: <CAM_iQpUAfiP2pitFpc-wSy4f_JQo_Wh3BQDxEsT2wwSHDPERow@mail.gmail.com>
Date:   Thu, 18 Apr 2019 15:51:07 -0700
From:   Cong Wang <xiyou.wangcong@...il.com>
To:     Tony Luck <tony.luck@...el.com>
Cc:     Borislav Petkov <bp@...en8.de>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] RAS/CEC: Add debugfs switch to disable at run time

On Thu, Apr 18, 2019 at 3:02 PM Tony Luck <tony.luck@...el.com> wrote:
>
> Useful when running error injection tests that want to
> see all of the MCi_(STATUS|ADDR|MISC) data via /dev/mcelog.
>
> Signed-off-by: Tony Luck <tony.luck@...el.com>

We saw the same problem, CONFIG_RAS hijacks all the
correctable memory errors, which leaves mcelog "broken"
silently. I know it is arguable, but until we can switch from
mcelog to rasdaemon, mcelog should still work as before.

I like this idea of disabling it at runtime, so:

Acked-by: Cong Wang <xiyou.wangcong@...il.com>

Thanks.