linux-kernel - Re: [PATCH v2 2.6.38-rc8-tip 7/20] 7: uprobes: store/restore original instruction.

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Message-ID: <alpine.LFD.2.00.1103151538200.2787@localhost6.localdomain6>
Date:	Tue, 15 Mar 2011 15:41:20 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
cc:	Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...e.hu>,
	Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Oleg Nesterov <oleg@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	SystemTap <systemtap@...rces.redhat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v2 2.6.38-rc8-tip 7/20] 7: uprobes: store/restore original
 instruction.

On Mon, 14 Mar 2011, Srikar Dronamraju wrote:
>  static int install_uprobe(struct mm_struct *mm, struct uprobe *uprobe)
>  {
> -	int ret = 0;
> +	struct task_struct *tsk;
> +	int ret = -EINVAL;
>  
> -	/*TODO: install breakpoint */
> -	if (!ret)
> +	get_task_struct(mm->owner);

Increment task ref before checking for NULL ?

> +	tsk = mm->owner;
> +	if (!tsk)
> +		return ret;
> +
  
Thanks,

	tglx
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