linux-kernel - Re: [PATCH v4 3.0-rc2-tip 14/22] 14: x86: uprobes exception notifier for x86.

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Date:	Tue, 21 Jun 2011 15:31:24 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Ingo Molnar <mingo@...e.hu>, Steven Rostedt <rostedt@...dmis.org>,
	Linux-mm <linux-mm@...ck.org>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Hugh Dickins <hughd@...gle.com>,
	Christoph Hellwig <hch@...radead.org>,
	Andi Kleen <andi@...stfloor.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Jonathan Corbet <corbet@....net>,
	Oleg Nesterov <oleg@...hat.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jim Keniston <jkenisto@...ux.vnet.ibm.com>,
	Roland McGrath <roland@...k.frob.com>,
	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 3.0-rc2-tip 14/22] 14: x86: uprobes exception
 notifier for x86.

On Tue, 2011-06-07 at 18:31 +0530, Srikar Dronamraju wrote:
> @@ -844,6 +845,19 @@ do_notify_resume(struct pt_regs *regs, void *unused, __u32 thread_info_flags)
>         if (thread_info_flags & _TIF_SIGPENDING)
>                 do_signal(regs);
>  
> +       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);
> +       } 

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.
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