linux-kernel - Re: [PATCH] edac: Add a sysfs node to test the EDAC error report facility

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Date:	Tue, 13 Mar 2012 16:31:38 -0700
From:	Greg KH <gregkh@...uxfoundation.org>
To:	Mauro Carvalho Chehab <mchehab@...hat.com>
Cc:	Linux Edac Mailing List <linux-edac@...r.kernel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] edac: Add a sysfs node to test the EDAC error report
 facility

On Wed, Mar 07, 2012 at 09:08:21AM -0300, Mauro Carvalho Chehab wrote:
> Even on memory controllers that have memory injection, such functionality
> can be disabled by BIOS during bootstrap, and it may not be possible to
> enable it via BIOS setup.
> 
> So, as not all hardware supports error injection, add a mechanism to
> allow testing the edac driver and the core.
> 
> This feature is only enabled when EDAC_DEBUG is equal to Y, so there's no
> extra code for the production Kernels.

Then please move it to debugfs, where debugging stuff belongs.

At the least, you need to document all sysfs files in Documentation/ABI/

> 
> Signed-off-by: Mauro Carvalho Chehab <mchehab@...hat.com>
> ---
> 
> NOTE: This patch should be applied after the series that add proper support for
> FB-DIMM, due to context changes.
> 
>  drivers/edac/edac_mc_sysfs.c |   62 ++++++++++++++++++++++++++++++++++++++++-
>  include/linux/edac.h         |    4 +++
>  2 files changed, 64 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/edac/edac_mc_sysfs.c b/drivers/edac/edac_mc_sysfs.c
> index 870ccb0..f538f9e 100644
> --- a/drivers/edac/edac_mc_sysfs.c
> +++ b/drivers/edac/edac_mc_sysfs.c
> @@ -744,6 +744,42 @@ static ssize_t mci_size_mb_show(struct mem_ctl_info *mci, char *data,
>  	return sprintf(data, "%u\n", PAGES_TO_MiB(total_pages));
>  }
>  
> +#ifdef CONFIG_EDAC_DEBUG
> +static ssize_t edac_fake_inject_show(struct mem_ctl_info *mci,
> +				     char *data, void *priv)
> +{
> +	return sprintf(data,
> +		       "EDAC fake test engine. Writing to this node a value in the form of :\n"
> +		       "\t0:1:0\n"
> +		       "will call the EDAC core routine to produce a memory error for the given memory location (0, 1, 0).\n"
> +		       "The driver's error parsing logic won't be tested. This tool is useful only\n"
> +		       "if you're testing the EDAC core tracing facility, or if you're needing to test\n"
> +		       "some userspace application.\n");
> +}

Ick, no NEVER do this for a sysfs file, even for "debugging", that's
what debugfs is for, please move this file there, this isn't ok.

Again, sysfs is "one value per file".

thanks,

greg k-h
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