linux-kernel - Re: [PATCH 29/31] memblock: Prepare to include linux/memblock.h in core file

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Date:	Wed, 28 Jul 2010 15:27:31 +1000
From:	Benjamin Herrenschmidt <benh@...nel.crashing.org>
To:	Yinghai Lu <yinghai@...nel.org>
Cc:	Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	David Miller <davem@...emloft.net>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Johannes Weiner <hannes@...xchg.org>,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org
Subject: Re: [PATCH 29/31] memblock: Prepare to include linux/memblock.h in
 core file

On Thu, 2010-07-22 at 11:21 -0700, Yinghai Lu wrote:
> Need to add protection in linux/memblock.h, to prepare to include it in
>  mm/page_alloc.c and mm/bootmem.c etc.

Not really no ... having the definitions shouldn't hurt whether memblock
is used or not, no ?

I'm going to keep that patch in the queue because it has one advantage
that you don't mention, which is to more easily catch attempts to
use those functions when CONFIG_HAVE_MEMBLOCK isn't set, but I'll update
the commit message.

Ben.

> Signed-off-by: Yinghai Lu <yinghai@...nel.org>
> ---
>  include/linux/memblock.h |    3 +++
>  1 files changed, 3 insertions(+), 0 deletions(-)
> 
> diff --git a/include/linux/memblock.h b/include/linux/memblock.h
> index 89749c4..4aaaf0d 100644
> --- a/include/linux/memblock.h
> +++ b/include/linux/memblock.h
> @@ -2,6 +2,7 @@
>  #define _LINUX_MEMBLOCK_H
>  #ifdef __KERNEL__
>  
> +#ifdef CONFIG_HAVE_MEMBLOCK
>  /*
>   * Logical memory blocks.
>   *
> @@ -147,6 +148,8 @@ static inline unsigned long memblock_region_pages(const struct memblock_region *
>  	     region++)
>  
> 
> +#endif /* CONFIG_HAVE_MEMBLOCK */
> +
>  #endif /* __KERNEL__ */
>  
>  #endif /* _LINUX_MEMBLOCK_H */


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