linux-kernel - Re: [PATCH 1/2] staging: remove null checks before kfree

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Date:	Thu, 24 Feb 2011 12:25:47 -0500
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Greg KH <gregkh@...e.de>
Cc:	Ilia Mirkin <imirkin@...m.mit.edu>, devel@...verdev.osuosl.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] staging: remove null checks before kfree

On Thu, 2011-02-24 at 09:06 -0800, Greg KH wrote:
> On Thu, Feb 24, 2011 at 11:08:29AM -0500, Steven Rostedt wrote:
> > On Tue, Feb 22, 2011 at 03:53:40AM -0500, Ilia Mirkin wrote:
> > > This patch was created with the following semantic patch:
> > > 
> > > // <smpl>
> > > @@
> > > expression E;
> > > @@
> > > 
> > > - if (E != NULL) kfree(E);
> > > + kfree(E);
> > > // </smpl>
> > 
> > OK, so when will we be removing the unlikely() from the implementations
> > of kfree()?
> > 
> > 	if (unlikely(ZERO_OR_NULL_PTR(block)))
> > 			return;
> 
> Have you run the tool that checks for unlikely being true here?  Odds
> are, even with all of these changes, the large majority of the time
> kfree is called, it has a valid pointer.

Crap, all my saved output files were in the /tmp directory and has since
been purged. I can reboot into the unlikely tracing kernel again, but
that may have to wait. I usually just do that at end of year as a
cleanup.

I can't remember exactly where kfree came in, but IIRC it was on the
list. Maybe not that high though.

-- Steve


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