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

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Date:	Fri, 1 Feb 2013 16:20:02 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Cody P Schafer <cody@...ux.vnet.ibm.com>
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 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.

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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