linux-kernel - Re: [PATCH] irq: Export symbol no

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Message-ID: <alpine.DEB.2.02.1403041645060.18573@ionos.tec.linutronix.de>
Date:	Tue, 4 Mar 2014 16:46:14 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Alexander Shiyan <shc_work@...l.ru>
cc:	linux-kernel@...r.kernel.org, Mark Brown <broonie@...nel.org>
Subject: Re: [PATCH] irq: Export symbol no_action()

On Tue, 4 Mar 2014, Alexander Shiyan wrote:

> Вторник,  4 марта 2014, 12:05 +01:00 от Thomas Gleixner <tglx@...utronix.de>:
> > On Sat, 1 Mar 2014, Alexander Shiyan wrote:
> > 
> > > This will allow to use dummy IRQ handler no_action() from
> > > drivers compiled as module. For example, dummy handler is could
> > > be used for drivers that use ARM FIQ interrupts.
> > 
> > And why exactly requires a driver which uses ARM FIQ interrupts the
> > no_action implementation?
>
 
> FIQ Interrupt handler is not used in this function. In FIQ case this
> is just a dummy declaration. Real handler is assigned by using the
> set_fiq_handler().

Why do you need a dummy declaration at all?

set_fiq_handler() is completely detached from the generic interrupt
subsystem.

Thanks,

	tglx