linux-kernel - Re: [PATCH 12/15] sound: add missing HAS_IOPORT and GENERIC

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Date:	Thu, 07 Feb 2013 02:13:19 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Takashi Iwai <tiwai@...e.de>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>, axboe@...nel.dk,
	cbou@...l.ru, davem@...emloft.net, dtor@...l.ru,
	dwmw2@...radead.org, grant.likely@...retlab.ca,
	gregkh@...uxfoundation.org, jkosina@...e.cz, jslaby@...e.cz,
	khali@...ux-fr.org, mchehab@...hat.com, perex@...ex.cz,
	sameo@...ux.intel.com, w.sang@...gutronix.de,
	linux-kernel@...r.kernel.org, sebott@...ux.vnet.ibm.com,
	gerald.schaefer@...ibm.com, schwidefsky@...ibm.com
Subject: Re: [PATCH 12/15] sound: add missing HAS_IOPORT and GENERIC_HARDIRQS dependencies

On Wednesday 06 February 2013 18:05:14 Takashi Iwai wrote:
> At Wed,  6 Feb 2013 17:24:00 +0100,
> Heiko Carstens wrote:
> > 
> > Fix these two compile errors on s390 which does not have HAS_IOPORT
> > nor GENERIC_HARDIRQS:
> > 
> > sound/pci/lx6464es/lx6464es.c: In function ‘snd_lx6464es_free’:
> > sound/pci/lx6464es/lx6464es.c:565:2: error: implicit declaration of function ‘ioport_unmap’
> 
> Shouldn't this be fixed rather in asm-generic/io.h?
> Something like,
> 
> #if defined(CONFIG_HAS_IOPORT) && defined(CONFIG_GENERIC_IOMAP)
> extern void __iomem *ioport_map(unsigned long port, unsigned int nr);
> extern void ioport_unmap(void __iomem *p);
> #else
> static inline void __iomem *ioport_map(unsigned long port, unsigned int nr)
> {
> 	return (void __iomem *) port;
> }
> 
> static inline void ioport_unmap(void __iomem *p)
> {
> }
> #endif /* CONFIG_HAS_IOPORT */

No, it is intentional that the CONFIG_HAS_IOPORT symbol refers to
the fact that you can use the ioport_map function, in order to
disallow building drivers that depend on this function when it
is unavailable. I actually want to change this, but in the opposite
way of what you are proposing:

I think CONFIG_HAS_IOPORT should refer to the fact that the
inb/outb family of functions are usuable and be unset when
they are not provided, and I would introduce a new
CONFIG_HAS_IOPORT_MAP symbol for those (few) platforms that
have a working inb/outb but no ioport_map.

> > sound/soc/codecs/wm8903.c: In function ‘wm8903_set_pdata_irq_trigger’:
> > sound/soc/codecs/wm8903.c:1954:9: error: implicit declaration of function ‘irq_get_irq_data’
> 
> Ditto, how about defining
> 
> #ifndef CONFIG_GENERIC_HARDIRQS
> #define irq_get_irq_data(x)  NULL
> #endif
> 
> somewhere appropriately?
> 

Why not just make CONFIG_GENERIC_HARDIRQS mandatory for all
platforms. It is use almost everywhere now.

	Arnd
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