On Wed, Oct 17, 2012 at 04:57:30PM +0530, Naveen N. Rao wrote: > 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.
That I figured out. What I can't figure out is why userspace tools need to know that - the fact that some MCI_CTL2 has a 0 CMCI threshold because BIOS forgot to set it correctly? IOW, this is a rather evolved workaround for b0rked BIOS (the gazillionth BIOS f*ckup, btw if someone is counting :)) and, on top of that, we have a read-only, special sysfs node which is pretty useless to me. Why? -- Regards/Gruss, Boris. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/