linux-kernel - Re: Microblaze noMMU/MMU merge

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Date:	Tue, 21 Apr 2009 11:46:06 +0200
From:	Michal Simek <michal.simek@...alogix.com>
To:	Sam Ravnborg <sam@...nborg.org>
CC:	Ingo Molnar <mingo@...e.hu>, lkml <linux-arch@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Arnd Bergmann <arnd@...db.de>,
	Linux Kernel list <linux-kernel@...r.kernel.org>
Subject: Re: Microblaze noMMU/MMU merge

Sam Ravnborg wrote:
> On Tue, Apr 21, 2009 at 09:45:47AM +0200, Michal Simek wrote:
>   
>> Hi All,
>>
>> I would like to say your opinion about putting together Microblaze MMU
>> arch to noMMU version.
>>
>> In C code will be #ifdef CONFIG_MMU ... #endif  or #ifndef.
>>
>> Here is proposal for headers. The similar style is used in m68k but I
>> would like to have the same code
>> for both archs in main file.
>>
>> #ifndef _ASM_MICROBLAZE_PAGE_H
>> #define _ASM_MICROBLAZE_PAGE_H
>>
>> code for noMMU and MMU which is the same for both.
>>
>> #ifdef __uClinux__
>> #include "page_no.h" -> noMMU specific
>> #else
>> #include "page_mm.h"-> MMU specific
>> #endif
>> #endif /* _ASM_MICROBLAZE_PAGE_H */
>>     
>
> Use dedicated header files for nommu / mmu only when it is really necessary.
>
> In headers that are _NOT_ exported you can use CONFIG_MMU to test
> if you are building for MMU or not - which is more readable.
>  
> The reason why you cannot use CONFIG_MMU in exported headers
> are that CONFIG_MMU is not valid in the userspace headers (not set/unset).
>
> In the optimal case you have no conditionals in the exported haders
> and then just use CONFIG_MMU all over.
>   
ok. I'll create first proposal and you can look if is ok or not.

Thanks.
Michal

> 	Sam
>
>   


-- 
Michal Simek, Ing. (M.Eng)
PetaLogix - Linux Solutions for a Reconfigurable World
w: www.petalogix.com p: +61-7-30090663,+42-0-721842854 f: +61-7-30090663

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