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Subject: Re: [PATCH v4 3.0-rc2-tip 14/22] 14: x86: uprobes exception
 notifier for x86.
From: Peter Zijlstra <peterz@infradead.org>
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Date: Tue, 21 Jun 2011 15:32:47 +0200
Message-ID: <1308663167.26237.146.camel@twins>
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Sender: owner-linux-mm@kvack.org
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To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@elte.hu>, Steven Rostedt <rostedt@goodmis.org>, Linux-mm <linux-mm@kvack.org>, Arnaldo Carvalho de Melo <acme@infradead.org>, Linus Torvalds <torvalds@linux-foundation.org>, Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>, Hugh Dickins <hughd@google.com>, Christoph Hellwig <hch@infradead.org>, Andi Kleen <andi@firstfloor.org>, Thomas Gleixner <tglx@linutronix.de>, Jonathan Corbet <corbet@lwn.net>, Oleg Nesterov <oleg@redhat.com>, Andrew Morton <akpm@linux-foundation.org>, Jim Keniston <jkenisto@linux.vnet.ibm.com>, Roland McGrath <roland@hack.frob.com>, Ananth N Mavinakayanahalli <ananth@in.ibm.com>, LKML <linux-kernel@vger.kernel.org>

On Tue, 2011-06-21 at 15:31 +0200, Peter Zijlstra wrote:
> On Tue, 2011-06-07 at 18:31 +0530, Srikar Dronamraju wrote:
> > @@ -844,6 +845,19 @@ do_notify_resume(struct pt_regs *regs, void *unuse=
d, __u32 thread_info_flags)
> >         if (thread_info_flags & _TIF_SIGPENDING)
> >                 do_signal(regs);
> > =20
> > +       if (thread_info_flags & _TIF_UPROBE) {
> > +               clear_thread_flag(TIF_UPROBE);
> > +#ifdef CONFIG_X86_32
> > +               /*
> > +                * On x86_32, do_notify_resume() gets called with
> > +                * interrupts disabled. Hence enable interrupts if they
> > +                * are still disabled.
> > +                */
> > +               local_irq_enable();
> > +#endif
> > +               uprobe_notify_resume(regs);
> > +       }=20
>=20
> Would it make sense to do TIF_UPROBE before TIF_SIGPENDING? That way
> when uprobe decides it ought to have send a signal we don't have to do
> another loop through all this.


Also, it might be good to unify x86_86 and i386 on the interrupt thing,
instead of propagating this difference (unless of course there's a good
reason they're different, but I really don't know this code well).

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