linux-kernel - Re: [PATCH 1/11] Add generic helpers for arch IPI function calls

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Date:	Tue, 22 Apr 2008 16:43:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Avi Kivity <avi@...ranet.com>
Cc:	Jens Axboe <jens.axboe@...cle.com>, linux-arch@...r.kernel.org,
	linux-kernel@...r.kernel.org, npiggin@...e.de,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 1/11] Add generic helpers for arch IPI function calls

On Tue, 2008-04-22 at 17:38 +0300, Avi Kivity wrote:
> Jens Axboe wrote:
> >> Introducing this fallback will make any usage from irq disabled context
> >> deadlock prone.
> >>
> >> I rather like the current interface.
> >>     
> >
> > Hmm good point, I'll back that bit out again.
> >   
> 
> But then you need to fix all callers to handle errors.

Sure.

> Perhaps we need a new flag for failable async IPIs (or better, API).  
> I'm pretty sure no one uses s_c_f_s() from irq disabled context on x86, 
> since it will WARN_ON(irqs_disabled()).

Yeah, no current users, but that doesn't say I don't want to add new
ones ;-)

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