linux-kernel - Re: [Patch/RFC]: check CONFIG_GENERIC_HARDIRQS for request/free

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Date:	Thu, 29 May 2008 19:04:44 +0200
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Christian Borntraeger <borntraeger@...ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [Patch/RFC]: check CONFIG_GENERIC_HARDIRQS for
	request/free_irq in interrupt.h

On Thu, 2008-05-29 at 17:41 +0200, Christian Borntraeger wrote:
> I currently try to evaluate virtio_console for kvm on s390 and got
> the following problem:
> 
> virtio_console uses hvc_alloc with irq=0. That means, register_irq
> and free_irq are never called by hvc_console.c, but the linker will
> still complain about unknown references to free_irq and request_irq.
> 
> As the whole kernel/irq folder depends on CONFIG_GENERIC_HARDIRQS 
> it seems consistent to declare all functions from kernel/irq only if
> CONFIG_GENERIC_HARDIRQS is set. Otherwise we can use empty functions.
> 
> This patch does that for register_irq and free_irq. 
> 
> Comments?

Please don't. So far whenever the linker complained about the missing
register_irq/free_irq functions it has been a bug in a Kconfig file.
We should not silently accept code that requires the concept of an
irq-line when there is no such thing on a s390.

-- 
blue skies,
  Martin.

"Reality continues to ruin my life." - Calvin.


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