linux-kernel - Re: tick-common.c hack for s390 needed

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Date:	Wed, 19 Mar 2008 05:12:57 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Heiko Carstens <heiko.carstens@...ibm.com>
Cc:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	linux-kernel@...r.kernel.org,
	Martin Schwidefsky <schwidefsky@...ibm.com>
Subject: Re: tick-common.c hack for s390 needed

On Tuesday 18 March 2008, Heiko Carstens wrote:
> Actually there's a huge #ifndef CONFIG_S390 in linux/irq.h ;)
> 
> To make the code work the patch below is necessary. It's ok since all
> clock event devices on s390 are per cpu. However I think this patch is
> ugly at best. Any ideas how to fix this in a better and more generic way?

You could have an #else path in linux/irq.h to just define these
functions as s390, maybe like

static inline int irq_set_affinity(unsigned int irq, cpumask_t cpumask)
{
	BUG();
	return 0;
}
static inline int irq_can_set_affinity(unsigned int irq)
{
	return 0;
}

	Arnd <><
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