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

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Message-Id: <20110622164055.1F5162C11F@topped-with-meat.com>
Date:	Wed, 22 Jun 2011 09:40:55 -0700 (PDT)
From:	Roland McGrath <roland@...k.frob.com>
To:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, 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>,
	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.

> Oleg, Roland, do you know why do_notify_resume() gets called with
> interrupts disabled on i386? 

It was that way for a long time.  My impression was that it was just not
bothering to reenable before do_signal->get_signal_to_deliver would shortly
disable (via spin_lock_irq) anyway.  It's possible there was something more
to it, but I don't know of anything.


Thanks,
Roland
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