linux-kernel - Re: single bit flip detector.

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Message-Id: <20060802091209.0fc8876d.rdunlap@xenotime.net>
Date:	Wed, 2 Aug 2006 09:12:09 -0700
From:	"Randy.Dunlap" <rdunlap@...otime.net>
To:	Patrick McLean <pmclean@...ubishops.ca>
Cc:	Dave Jones <davej@...hat.com>, Andreas Schwab <schwab@...e.de>,
	Alexey Dobriyan <adobriyan@...il.com>,
	Alan Cox <alan@...rguk.ukuu.org.uk>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: single bit flip detector.

On Wed, 02 Aug 2006 11:24:13 -0400 Patrick McLean wrote:

> Dave Jones wrote:
> > On Tue, Aug 01, 2006 at 07:51:09PM -0400, Dave Jones wrote:
> >  > I'm going for the record of 'most times a patch gets submitted in one day'.
> >  > And to think we were complaining that patches don't get enough review ? :)
> >  > If every change had this much polish, we'd be awesome.
> > 
> > Sigh. Spaces before printk. Whatever next.
> > I am now officially bored of seeing this patch.
> > 
> > 		Dave
> > 
> > 
> > In case where we detect a single bit has been flipped, we spew
> > the usual slab corruption message, which users instantly think
> > is a kernel bug.  In a lot of cases, single bit errors are
> > down to bad memory, or other hardware failure.
> > 
> > This patch adds an extra line to the slab debug messages
> > in those cases, in the hope that users will try memtest before
> > they report a bug.
> > 
> > 000: 6b 6b 6b 6b 6a 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b 6b
> > Single bit error detected. Possibly bad RAM. Run memtest86.
> > 
> > Signed-off-by: Dave Jones <davej@...hat.com>
> > 
> > +		if (errors && !(errors & (errors-1))) {
> > +			printk(KERN_ERR "Single bit error detected. Probably bad RAM.\n");
> > +#ifdef CONFIG_X86
> 
> #if defined(CONFIG_X86) || defined(CONFIG_X86_64)

CONFIG_X86 is set on both x86-32 and x86-64.


> memtest86+ runs fine on x86_64 machines as well.
> 
> > +			printk(KERN_ERR "Run memtest86+ or a similar memory test tool.\n");
> > +#else
> > +			printk(KERN_ERR "Run a memory test tool.\n");
> -


---
~Randy
-
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