linux-kernel - Re: [patch 09/12] xtensa: allow platform and variant to initialize own irq chips

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Date:	Thu, 23 Apr 2009 18:16:50 +0200
From:	Daniel Glöckner <dg@...ix.com>
To:	Chris Zankel <chris@...kel.net>
CC:	Johannes Weiner <jw@...ix.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [patch 09/12] xtensa: allow platform and variant to initialize
 own irq chips

Hi,

On 04/23/2009 09:19 AM, Chris Zankel wrote:
>> -#ifdef CONFIG_VARIANT_IRQ_SWITCH
>>  #include <variant/irq.h>
>> -#else
>> +#ifndef CONFIG_VARIANT_IRQ_SWITCH
>>  static inline void variant_irq_enable(unsigned int irq) { }
>>  static inline void variant_irq_disable(unsigned int irq) { }
>>  #endif
> 
> What was the reason for this change? We shouldn't require all processor
> variants to provide an irq.h header file, unless required (and we
> wouldn't need to add the following files)

Let me quote a few more lines of that hunk:

>>
>> +#ifndef VARIANT_NR_IRQS
>> +# define VARIANT_NR_IRQS 0
>> +#endif

Where can a variant define VARIANT_NR_IRQS if not inside a new header?
Do you prefer it being defined in core.h, tie.h, or tie-asm.h?

I think this boils down to the restructuring necessary in arch/xtensa that will
draw a line between the Xtensa core and a SoC featuring that core (as it was
described by Marc on March 31 on the linux-xtensa list). Of course a "core" will
never need any IRQs beyond XTENSA_NR_IRQS.

Another possibility would be to select VARIANT_IRQ_SWITCH (or a dedicated new
Kconfig option) in all SoCs that need additional IRQs.

  Daniel

-- 
Dipl.-Math. Daniel Glöckner, emlix GmbH, http://www.emlix.com
Fon +49 551 30664-0, Fax -11, Bahnhofsallee 1b, 37081 Göttingen, Germany
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