linux-kernel - Re: [PATCH 2/2] Hardware error record persistent support

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Date:	Fri, 19 Nov 2010 07:52:08 -0800
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Huang Ying <ying.huang@...el.com>
Cc:	Len Brown <lenb@...nel.org>, linux-kernel@...r.kernel.org,
	Andi Kleen <andi@...stfloor.org>, linux-acpi@...r.kernel.org,
	Peter Zijlstra <peterz@...radead.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...e.hu>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 2/2] Hardware error record persistent support

On Fri, Nov 19, 2010 at 12:10 AM, Huang Ying <ying.huang@...el.com> wrote:
> Normally, corrected hardware error records will go through the kernel
> processing and be logged to disk or network finally.  But for
> uncorrected errors, system may go panic directly for better error
> containment, disk or network is not usable in this half-working
> system.  To avoid losing these valuable hardware error records, the
> error records are saved into some kind of simple persistent storage
> such as flash before panic, so that they can be read out after system
> reboot successfully.

I think this is totally the wrong thing to do. TOTALLY.

The fact is, concentrating about "hardware errors" makes this
something that I refuse to merge. It's such an idiotic approach that
it's disgusting.

Now, if this was designed to be a "hardware-backed persistent 'printk'
buffer", and was explicitly meant to save not just some special
hardware error, but catch all printk's (which may be due to hardware
errors or oopses or warnings or whatever), that would be useful.

But limiting it to just some special source of errors makes this
pointless and not ever worth merging.

               Linus
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