linux-kernel - Re: [PATCH v3 09/17] m68k: io: implement dummy relaxed accessor macros for writes

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Date:	Thu, 25 Sep 2014 11:33:37 +0100
From:	Will Deacon <will.deacon@....com>
To:	Geert Uytterhoeven <geert@...ux-m68k.org>
Cc:	Greg Ungerer <gerg@...inux.org>,
	"linux-arch@...r.kernel.org" <linux-arch@...r.kernel.org>,
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Subject: Re: [PATCH v3 09/17] m68k: io: implement dummy relaxed accessor
 macros for writes

On Thu, Sep 25, 2014 at 10:51:10AM +0100, Geert Uytterhoeven wrote:
> On Thu, Sep 25, 2014 at 11:33 AM, Will Deacon <will.deacon@....com> wrote:
> >> Putting them here means they won't have any multiple include protection
> >> (there is no "#ifndef _IO_H" around them). Doesn't seem to lead to
> >> any problems in practice. Just flagging it...
> >
> > That's easy enough to fix, and actually, we should have __KERNEL__ checks
> > here too. Fixup below.
> 
> Why do we need __KERNEL__ checks? <asm/io.h> is not exported.
> BTW, it seems there are many __KERNEL__ checks in arch/*/include/asm/
> we don't need.
> 
> Or do I need more coffee?

No, I think you're quite right. I just saw the __KERNEL__ checks in io_no.h
and io_mm.h -- the latter even has some code outside of the guards:


#endif /* __KERNEL__ */

#define __ARCH_HAS_NO_PAGE_ZERO_MAPPED		1

/*
 * Convert a physical pointer to a virtual kernel pointer for /dev/mem
 * access
 */
#define xlate_dev_mem_ptr(p)	__va(p)

/*
 * Convert a virtual cached pointer to an uncached pointer
 */
#define xlate_dev_kmem_ptr(p)	p

#define ioport_map(port, nr)	((void __iomem *)(port))

#endif /* _IO_H */


Will
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