linux-kernel - Re: [RESEND] [RFC][PATCH X86_32 1/2]: Call do_notify

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Message-ID: <20111103044344.GC2335@linux.vnet.ibm.com>
Date:	Thu, 3 Nov 2011 10:13:44 +0530
From:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Cc:	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Christoph Hellwig <hch@...radead.org>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Shuah Khan <shuah.khan@...com>,
	Alexander van Heukelum <heukelum@...tmail.fm>,
	Russell King <rmk@....linux.org.uk>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RESEND] [RFC][PATCH X86_32 1/2]: Call do_notify_resume() with
 interrupts enabled

> Ingo, Thomas, I think this is your call, but it seems valid,
> 
>                  Linus
> 

Hey Ingo, Thomas,

Can you please let me know if you have taken a look at this patch and if
you have any reservations? 

I would also be happy to know your thoughts on the other patch in the
series which makes sure that notify_die is called irrespective of
kprobes.

-- 
Thanks and Regards
Srikar

> On Tue, Oct 25, 2011 at 6:14 PM, Oleg Nesterov <oleg@...hat.com> wrote:
> > On 10/25, Srikar Dronamraju wrote:
> >>
> >> do_notify_resume() gets called with interrupts disabled on x86_32. This
> >> is different from the x86_64 behavior, where interrupts are enabled at
> >> the time.
> >
> > And note that do_notify_resume() paths assume that irqs are enabled.
> > key_replace_session_keyring/get_signal_to_deliver start with _lock_irq.
> >
> > IOW, I vote for this change even if I can't ack it (although it looks
> > "obviously correct" to me). In fact refrigerator() looks buggy without
> > this change. Yes, it enables irqs but only "by accident", via unlock_irq().
> > And we are going to remove this recalc_sigpending() from freezer.
> >
> >
> >> Queries on lkml on this issue hasn't yielded any clear answer. Lets make
> >> x86_32 behave the same as x86_64, unless there is a real reason to
> >> maintain status quo.
> >>
> >> Please refer https://lkml.org/lkml/2011/9/27/130 for more details
> >>
> >> A similar change was suggested in arm
> >>       https://lkml.org/lkml/2011/8/25/231
> >>
> >> My 32-bit machine works fine (tm) with the patch below
> >>

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