linux-kernel - Re: [PATCH EDAC 07/13] edac: add support for raw error reports

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Message-ID: <20130215160257.GK14387@pd.tnic>
Date:	Fri, 15 Feb 2013 17:02:57 +0100
From:	Borislav Petkov <bp@...en8.de>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	linux-acpi@...r.kernel.org, Huang Ying <ying.huang@...el.com>,
	Tony Luck <tony.luck@...el.com>,
	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH EDAC 07/13] edac: add support for raw error reports

On Fri, Feb 15, 2013 at 01:49:29PM -0200, Mauro Carvalho Chehab wrote:
> Sure, but calling kmalloc while handling a memory error doesn't seem
> a very good idea, IMHO. So, better to either use an already allocated
> space (or the stack).

Either that, or prealloc a buffer on EDAC initialization. You probably
won't need more than one in 99% of the cases so if you keep it simple
with a single static buffer for starters, that would probably be the
cleanest solution.

> Yes, I know, but, on the other hand, there's the additional cost of
> copying almost all data into the structure.

That's very easily paralelizable on out-of-order CPUs (I'd say, all of
them which need to run EDAC, can do that :-)) so it wouldn't hurt.

Also, you could allocate the struct in the callers and work directly
with its members before sending it down to edac_raw_mc_handle_error() -
that would probably simplify the code a bit more.

> Ok, I'll keep this patch on my git. I'll likely fold it with the
> previous one on the final patchset.

Yep.

Thanks.

-- 
Regards/Gruss,
    Boris.

Sent from a fat crate under my desk. Formatting is fine.
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