linux-kernel - Re: [PATCH 3/4] x86, mce: Add persistent MCE event

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Message-ID: <1304436872.25414.2403.camel@gandalf.stny.rr.com>
Date:	Tue, 03 May 2011 11:34:32 -0400
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Borislav Petkov <bp@...64.org>
Cc:	Joe Perches <joe@...ches.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Tony Luck <tony.luck@...el.com>,
	Mauro Carvalho Chehab <mchehab@...hat.com>,
	EDAC devel <linux-edac@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"Petkov, Borislav" <Borislav.Petkov@....com>
Subject: Re: [PATCH 3/4] x86, mce: Add persistent MCE event

On Tue, 2011-05-03 at 17:22 +0200, Borislav Petkov wrote:
> On Tue, May 03, 2011 at 11:14:16AM -0400, Joe Perches wrote:
> > On Tue, 2011-05-03 at 09:18 +0200, Borislav Petkov wrote:
> > > On Tue, May 03, 2011 at 02:44:01AM -0400, Ingo Molnar wrote:
> > > > * Borislav Petkov <bp@...64.org> wrote:
> > []
> > > > > +static struct dentry *mce_add_event_debugfs(struct perf_event *event, int cpu)
> > > > > +{
> > > > > +	char buf[14];

There should be no harm in upping that number to 32. (I've seen much
worse on stacks).

> > > > > +
> > > > > +	sprintf(buf, "mce_record%d", cpu);

At least change this to:

		snprintf(buf, 14, ....)

> > 
> > trivia:
> > 
> > buf[14] doesn't fit 10k+ cpus.
> 
> I'll fix that when someone comes up with a x86 system that supports 10k+
> CPUs with a single system image :).
> 

Best to fix it now, to save the trouble of finding this bug for those
that are maintaining this code long after we have retired or are dead ;)

-- Steve



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