linux-kernel - Re: [PATCH 1/4] uprobes/powerpc: Don't clear TIF_UPROBE in do_notify

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Message-ID: <20121029052707.GA3400@in.ibm.com>
Date:	Mon, 29 Oct 2012 10:57:07 +0530
From:	Ananth N Mavinakayanahalli <ananth@...ibm.com>
To:	Oleg Nesterov <oleg@...hat.com>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Anton Arapov <anton@...hat.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	Rabin Vincent <rabin@....in>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/4] uprobes/powerpc: Don't clear TIF_UPROBE in
	do_notify_resume()

On Sun, Oct 28, 2012 at 06:39:25PM +0100, Oleg Nesterov wrote:

Hi Oleg,

> Cleanup. No need to clear TIF_UPROBE, do_notify_resume() does this.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
> ---
>  arch/powerpc/kernel/signal.c |    4 +---
>  1 files changed, 1 insertions(+), 3 deletions(-)
> 
> diff --git a/arch/powerpc/kernel/signal.c b/arch/powerpc/kernel/signal.c
> index a2dc757..3b99711 100644
> --- a/arch/powerpc/kernel/signal.c
> +++ b/arch/powerpc/kernel/signal.c
> @@ -158,10 +158,8 @@ static int do_signal(struct pt_regs *regs)
> 
>  void do_notify_resume(struct pt_regs *regs, unsigned long thread_info_flags)

But this _is_ do_notify_resume()... I don't see this flag cleared
anywhere else.

Did you have something else in mind?

Ananth

>  {
> -	if (thread_info_flags & _TIF_UPROBE) {
> -		clear_thread_flag(TIF_UPROBE);
> +	if (thread_info_flags & _TIF_UPROBE)
>  		uprobe_notify_resume(regs);
> -	}
> 
>  	if (thread_info_flags & _TIF_SIGPENDING)
>  		do_signal(regs);
> -- 
> 1.5.5.1

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