linux-kernel - Re: [PATCH 2/5] mm: remove unlikly NULL from kfree

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Date:	Wed, 25 Mar 2009 08:50:44 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Pekka Enberg <penberg@...helsinki.fi>
cc:	Steven Rostedt <rostedt@...dmis.org>, linux-kernel@...r.kernel.org,
	Ingo Molnar <mingo@...e.hu>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Roland McGrath <roland@...hat.com>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Steven Rostedt <srostedt@...hat.com>,
	Christoph Lameter <cl@...ux-foundation.org>,
	Matt Mackall <mpm@...enic.com>
Subject: Re: [PATCH 2/5] mm: remove unlikly NULL from kfree

On Wed, 25 Mar 2009, Pekka Enberg wrote:
> On Wed, Mar 25, 2009 at 7:19 AM, Steven Rostedt <rostedt@...dmis.org> wrote:
> > This makes sense, since we now encourage developers to just call kfree
> > without checking for NULL.
> 
> But those are _error handling paths_ (at least supposed to be). I
> wonder which call-sites are responsible for this. Can frtrace help us
> here?

Why is this an error handler. We replaced tons of 

    if (obj)
       kfree(obj);

constructs all over the kernel with kfree(obj); and let kfree deal
with the NULL pointer.

Thanks,

	tglx

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