linux-kernel - Re: [PATCH v3] x86/mce: Honour bios-set CMCI threshold

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Message-ID: <507E9622.6090606@linux.vnet.ibm.com>
Date:	Wed, 17 Oct 2012 16:57:30 +0530
From:	"Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:	Borislav Petkov <bp@...en8.de>, tony.luck@...el.com,
	gong.chen@...ux.intel.com, ananth@...ibm.com,
	masbock@...ux.vnet.ibm.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, bp@...64.org, lcm@...ibm.com,
	andi@...stfloor.org, hpa@...or.com, tglx@...utronix.de,
	mingo@...hat.com, gregkh@...e.de, linux-edac@...r.kernel.org
Subject: Re: [PATCH v3] x86/mce: Honour bios-set CMCI threshold

On 10/17/2012 04:29 PM, Borislav Petkov wrote:
>>>
>>> +static struct dev_ext_attribute dev_attr_bios_cmci_threshold = {
>>> +	__ATTR(bios_cmci_threshold, 0444, device_show_int, NULL),
>>> +	&mce_bios_cmci_threshold
>
> Ok, I just noticed this (we must've missed it during review) but why is
> this read-only? If it has to be read-only, why do we have a node for
> this in sysfs instead of simply issuing the printk statements below and
> people who are interested in this, can grep dmesg?

This was added so that user-space tools could find out if we're using 
thresholds for CMCI.

Regards,
Naveen

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