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

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Message-ID: <20121029124325.GA31397@redhat.com>
Date:	Mon, 29 Oct 2012 13:43:25 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Ananth N Mavinakayanahalli <ananth@...ibm.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 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.

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>
---
 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)
 {
-	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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