linux-kernel - Re: [PATCH 1/9] mm: add SECTION_IN_PAGE

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Date:	Tue, 05 Feb 2013 14:23:45 -0800
From:	Cody P Schafer <cody@...ux.vnet.ibm.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
CC:	Linux MM <linux-mm@...ck.org>,
	David Hansen <dave@...ux.vnet.ibm.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH 1/9] mm: add SECTION_IN_PAGE_FLAGS

On 02/01/2013 04:20 PM, Andrew Morton wrote:
> On Thu, 17 Jan 2013 14:52:53 -0800
> Cody P Schafer <cody@...ux.vnet.ibm.com> wrote:
>
>> Instead of directly utilizing a combination of config options to determine this,
>> add a macro to specifically address it.
>>
>> ...
>>
>> --- a/include/linux/mm.h
>> +++ b/include/linux/mm.h
>> @@ -625,6 +625,10 @@ static inline pte_t maybe_mkwrite(pte_t pte, struct vm_area_struct *vma)
>>   #define NODE_NOT_IN_PAGE_FLAGS
>>   #endif
>>
>> +#if defined(CONFIG_SPARSEMEM) && !defined(CONFIG_SPARSEMEM_VMEMMAP)
>> +#define SECTION_IN_PAGE_FLAGS
>> +#endif
>
> We could do this in Kconfig itself, in the definition of a new
> CONFIG_SECTION_IN_PAGE_FLAGS.

Yep, I only put it here because it "sounds" the similar to 
NODE_NOT_IN_PAGE_FLAGS, but (of course) NODE_NOT_IN_PAGE_FLAGS isn't 
defined based on pure dependencies, while this is.

> I'm not sure that I like that sort of thing a lot though - it's rather a
> pain to have to switch from .[ch] over to Kconfig to find the
> definitions of things.  I should get off my tail and teach my ctags
> scripts to handle this.



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