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From: Nick Piggin <nickpiggin@yahoo.com.au>
To: Peter Zijlstra <peterz@infradead.org>
Subject: Re: x86: Is there still value in having a special tlb flush IPI vector?
Date: Tue, 29 Jul 2008 20:17:41 +1000
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Cc: Ingo Molnar <mingo@elte.hu>, Jeremy Fitzhardinge <jeremy@goop.org>,
       Jens Axboe <jens.axboe@oracle.com>, Andi Kleen <ak@suse.de>,
       Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>
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On Tuesday 29 July 2008 20:04, Peter Zijlstra wrote:
> On Tue, 2008-07-29 at 20:00 +1000, Nick Piggin wrote:
> > On Tuesday 29 July 2008 19:54, Peter Zijlstra wrote:
> > > On Tue, 2008-07-29 at 14:30 +1000, Nick Piggin wrote:
> > > > Not to mention the minor problem that it still deadlocks when called
> > > > with interrupts disabled ;)
> > >
> > > __smp_call_function_single has potential though..
> >
> > For reschedule interrupt? I don't really agree.
>
> Not specifically, for not deadlocking from irq-off, more so.

Oh, well yes it already does work from irq-off, so it has already
realised its potential :)

Not sure exactly what kinds of users it is going to attract, but
it should be interesting to see!