linux-kernel - Re: [PATCH] m68knommu: change definitions of __pa() and _

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Date:	Tue, 12 Jan 2010 19:45:02 +1000
From:	Greg Ungerer <gerg@...pgear.com>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	gerg@...inux.org, linux-m68k@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] m68knommu: change definitions of __pa() and __va()


On 01/12/2010 05:02 PM, Greg Ungerer wrote:
> Linus Torvalds wrote:
>> On Tue, 12 Jan 2010, Greg Ungerer wrote:
>>> +#else
>>> +#define page_to_phys(page) ((page - mem_map) << PAGE_SHIFT)
>>> +#define page_to_bus(page) ((page - mem_map) << PAGE_SHIFT)
>>> +#endif
>>
>> Ok, so the old ones were total crap too, but when moving things
>> around, don't just copy the crap like this.
>>
>> Look at those two #define's for five seconds, and ask yourself what is
>> wrong with them. Those macros are not good.
>
> Ok. Easily fixed.
>
> page_to_bus() doesn't even look like it is used anywhere (and m68k
> itself doesn't define it). So I'll remove it.
>
> I propose changing page_to_phys() to be:
>
> #define page_to_phys(page) (page_to_pfn(page) << PAGE_SHIFT)

Hmmm, on second thoughts maybe that change is better left
for the next merge window. Perhaps best to just fix that
arg bracketization now?


> Which seems consistent with many other arches. (And it works on
> m68knommu too :-)
>
> I'll generate a new patch with that changed.
>
> A quick grep shows page_to_phys() defined this way in a couple of
> other places too:
>
> h8300/include/asm/io.h
> sparc/include/asm/io_32.h

Strike that, only the h8300 one needs arg fixing.

Regards
Greg


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Greg Ungerer  --  Principal Engineer        EMAIL:     gerg@...pgear.com
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