linux-kernel - Re: use of preempt_count instead of in

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Message-Id: <20080321103732.ea08e189.akpm@linux-foundation.org>
Date:	Fri, 21 Mar 2008 10:37:32 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Jean Delvare <khali@...ux-fr.org>
Cc:	Alan Stern <stern@...land.harvard.edu>,
	Michael Buesch <mb@...sch.de>,
	Henrique de Moraes Holschuh <hmh@....eng.br>,
	David Brownell <david-b@...bell.net>,
	Richard Purdie <rpurdie@...ys.net>,
	<linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Geert Uytterhoeven <geert@...ux-m68k.org>
Subject: Re: use of preempt_count instead of in_atomic() at leds-gpio.c

On Fri, 21 Mar 2008 10:53:11 +0100 Jean Delvare <khali@...ux-fr.org> wrote:

> On Thu, 20 Mar 2008 20:17:23 -0700, Andrew Morton wrote:
> > in_atomic() is for core kernel use only.  (...)
> 
> Then why is it made available to drivers through <linux/hardirq.h>?

Because we suck.

> If
> it's such a dangerous macro to call from drivers, it shouldn't be made
> available, or at the very least there should be a big fat warning in
> <linux/hardirq.h> that drivers aren't supposed to use it. This would
> have avoided the 23 uses cases in drivers we have right now.

True.
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