linux-kernel - Re: [PATCH] Export current_is

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Date:	Thu, 7 Dec 2006 10:17:41 -0800
From:	Andrew Morton <akpm@...l.org>
To:	Jeff Garzik <jeff@...zik.org>, torvalds@...l.org,
	macro@...ux-mips.org, David Howells <dhowells@...hat.com>,
	rdreier@...co.com, afleming@...escale.com, ben.collins@...ntu.com,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] Export current_is_keventd() for libphy

On Thu, 7 Dec 2006 09:57:15 -0800
Andrew Morton <akpm@...l.org> wrote:

> On Thu, 07 Dec 2006 12:05:38 -0500
> Jeff Garzik <jeff@...zik.org> wrote:
> 
> > Yes, I merged the code, but looking deeper at phy its clear I missed 
> > some things.
> > 
> > Looking into libphy's workqueue stuff, it has the following sequence:
> > 
> > 	disable interrupts
> > 	schedule_work()
> > 
> > 	... time passes ...
> > 	... workqueue routine is called ...
> > 
> > 	enable interrupts
> > 	handle interrupt
> > 
> > I really have to question if a workqueue was the best choice of 
> > direction for such a sequence.  You don't want to put off handling an 
> > interrupt, with interrupts disabled, for a potentially unbounded amount 
> > of time.
> 
> That'll lock the box on UP, or if the timer fires on the current CPU?

oh. "disable interrupts" == disable_irq(), not local_irq_disable()?

Not so bad ;)
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