linux-kernel - Re: [PATCH -mm] markers: avoid call_rcu

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Message-Id: <20080711121842.070c1342.akpm@linux-foundation.org>
Date:	Fri, 11 Jul 2008 12:18:42 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
Cc:	Masami Hiramatsu <mhiramat@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Hideo AOKI <haoki@...hat.com>,
	Takahiro Yasui <tyasui@...hat.com>
Subject: Re: [PATCH -mm] markers: avoid call_rcu_sched if old is NULL

On Tue, 8 Jul 2008 23:02:01 -0400 Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca> wrote:

> * Masami Hiramatsu (mhiramat@...hat.com) wrote:
> > Introduce marker_entry_free_old() and check old pointer is NULL before
> > setting call_rcu_sched(), because marker_entry_remove/add_probe() can
> > return NULL.
> > 
> 
> Hi Masami,
> 
> I doubt this is a bug per se, because kfree accepts NULL pointers (and
> kfree is the only action done on the oldptr by free_old_closure).
> 
> This cleans up the code, so I think it's good to merge your patch, but I
> would definitely not classify this as a bugfix.
> 
> Acked-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>

I cannot get this to apply on the rather dated tree which I have on this
rather not-on-the-internet machine.  Please merge this patch locally, test,
rewrite the changelog and resend it to someone ;)

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