linux-kernel - Re: irq-disabled vs vmap vs text

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Date:	Fri, 13 Feb 2009 17:38:21 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Nick Piggin <npiggin@...e.de>,
	akpm <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: irq-disabled vs vmap vs text_poke

On Fri, 2009-02-13 at 11:32 -0500, Masami Hiramatsu wrote:

> >> Anybody got an idea on how to fix this?
> > 
> > There is probably something wrong with the caller, kprobes, which calls
> > text_poke with interrupts off.
> 
> Hmm, kprobe's smoke test caused this problem. Since (un)register_kprobe()
> may sleep for waiting a mutex, it should not be called with interrupts off.
> So, it's not text_poke()'s issue nor vmap().

Yeah, since noticed that, trying to figure out where the irq-disable
came from.. somewhat mysterious.
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