linux-kernel - Re: [PATCH 8/9] x86, RAS: Add attributes needed for HW injection

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Message-ID: <20111019210946.GC7503@aftab>
Date:	Wed, 19 Oct 2011 23:09:46 +0200
From:	Borislav Petkov <bp@...64.org>
To:	David Rientjes <rientjes@...gle.com>
Cc:	EDAC devel <linux-edac@...r.kernel.org>,
	Tony Luck <tony.luck@...el.com>, Ingo Molnar <mingo@...e.hu>,
	X86-ML <x86@...nel.org>, LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 8/9] x86, RAS: Add attributes needed for HW injection

On Wed, Oct 19, 2011 at 05:03:43PM -0400, David Rientjes wrote:
> > +static int inj_extcpu_set(void *data, u64 val)
> > +{
> > +	struct mce *m = (struct mce *)data;
> > +
> > +	if (val >= num_online_cpus()) {
> 
> That wouldn't catch an offline cpuid, you probably want cpu_online(val)?

Good catch, thanks.

So I'm looking at <arch/x86/kernel/cpuid.c> which is how the validity of
a cpu value should be tested properly, IMHO:

static int cpuid_open(struct inode *inode, struct file *file)
{
	...

	if (cpu >= nr_cpu_ids || !cpu_online(cpu))
		return -ENXIO;	/* No such CPU */
	...

Thanks.

-- 
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Boris.

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