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

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Date:	Mon, 29 Oct 2012 18:58:33 +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 Mon, Oct 29, 2012 at 01:43:25PM +0100, Oleg Nesterov wrote:
> On 10/29, Ananth N Mavinakayanahalli wrote:
> >
> > 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()...
> 
> Argh. I'll fix the changelog, see v2 below.
> 
> > I don't see this flag cleared
> > anywhere else.
> >
> > Did you have something else in mind?
> 
> Sorry for confusion.
> 
> As Srikar explained, it is cleared by uprobe_notify_resume(). See db023ea5
> "uprobes: Move clear_thread_flag(TIF_UPROBE) to uprobe_notify_resume()", it
> is already in Linus's tree.

I was looking at rc2.. that explains it.

> Oleg.
> 
> ------------------------------------------------------------------------------
> Subject: [PATCH 1/4] uprobes/powerpc: Don't clear TIF_UPROBE in do_notify_resume()
> 
> Cleanup. No need to clear TIF_UPROBE, uprobe_notify_resume() does this.
> 
> Signed-off-by: Oleg Nesterov <oleg@...hat.com>
Acked-by: Ananth N Mavinakayanahalli <ananth@...ibm.com>

Thanks Oleg!

Ananth

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