linux-kernel - Re: [PATCH 2/6] Revert "perf: Disable PERF_RECORD

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Message-ID: <20140516132630.GM50500@redhat.com>
Date:	Fri, 16 May 2014 09:26:30 -0400
From:	Don Zickus <dzickus@...hat.com>
To:	Jiri Olsa <jolsa@...hat.com>
Cc:	acme@...stprotocols.net, peterz@...radead.org,
	LKML <linux-kernel@...r.kernel.org>, namhyung@...il.com,
	eranian@...gle.com, Andi Kleen <andi@...stfloor.org>
Subject: Re: [PATCH 2/6] Revert "perf: Disable PERF_RECORD_MMAP2 support"

On Fri, May 16, 2014 at 01:25:14PM +0200, Jiri Olsa wrote:
> On Tue, May 13, 2014 at 12:48:13PM -0400, Don Zickus wrote:
> 
> SNIP
> 
> > -		/*
> > - 		 * Anon maps don't have the execname.
> > - 		 */
> > -		if (n < 4)
> > +		n = sscanf(bf, "%"PRIx64"-%"PRIx64" %s %"PRIx64" %x:%x %u %s\n",
> > +		       &event->mmap2.start, &event->mmap2.len, prot,
> > +		       &event->mmap2.pgoff, &event->mmap2.maj,
> > +		       &event->mmap2.min,
> > +		       &ino, execname);
> > +
> > +		event->mmap2.ino = (u64)ino;
> > +
> > +		if (n < 7)
> >  			continue;
> 
> any reason for changing this from 'if (n != 8)' ?

Yes, read 9d4ecc8893832337daf241236841db966fa53489. :-)

This wasn't a clean revert because of the change for (n != 5) -> (n < 4).
So I maintainted the spirit of the upstream code with this revert.  Let me
know if that is wrong.

Cheers,
Don
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