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

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Message-ID: <20090213142521.GB31922@Krystal>
Date:	Fri, 13 Feb 2009 09:25:21 -0500
From:	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Nick Piggin <npiggin@...e.de>,
	akpm <akpm@...ux-foundation.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: irq-disabled vs vmap vs text_poke

* Ingo Molnar (mingo@...e.hu) wrote:
> 
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > > I think I got a mostly working patch cobbled together sitting here
> > > somewhere. I was waiting for some _really_ good use case before spending
> > > more time on it. I would prefer if at all possible to do vmap operations
> > > in sleepable, process context.
> > 
> > Agreed, I think we want to fix text_poke() and make the vmap/vunmap()
> > ops yell louder at violations of these rules.
> > 
> > I'm just totally clueless wrt text_poke() hence this email ;-)
> 
> also, this started triggering yesterday for the first time - and never
> saw it before. Has some commit caused this side-effect?
> 
> It triggers during kprobes self-test - has that been improved recently?
> 

When is this self-test run ? If it's at early boot while still in UP
with interrupts off, kprobes should probably use text_poke_early()
rather than text_poke().

Mathieu


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Mathieu Desnoyers
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