linux-kernel - Re: [PATCH 1/2] memblock: add error return when CONFIG_HAVE

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Date:	Wed, 30 Mar 2011 18:40:06 -0700
From:	Yinghai Lu <yinghai@...nel.org>
To:	Mike Travis <travis@....com>
Cc:	Ingo Molnar <mingo@...e.hu>, David Rientjes <rientjes@...gle.com>,
	Jack Steiner <steiner@....com>, Robin Holt <holt@....com>,
	Len Brown <len.brown@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	"H. Peter Anvin" <hpa@...or.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	linux-acpi@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org, Tejun Heo <tj@...nel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 1/2] memblock: add error return when CONFIG_HAVE_MEMBLOCK
 is not set

On Wed, Mar 30, 2011 at 5:41 PM, Mike Travis <travis@....com> wrote:
> Subject: memblock: add error return when CONFIG_HAVE_MEMBLOCK is not set
> Author: Yinghai Lu <yinghai@...nel.org>
>
>        Add an error return if CONFIG_HAVE_MEMBLOCK is not set instead
>        of having to add #ifdef CONFIG_HAVE_MEMBLOCK around blocks of
>        code calling that function.
>
> Signed-off-by: Mike Travis <travis@....com>
> ---
> include/linux/memblock.h |    9 ++++++++-
> 1 file changed, 8 insertions(+), 1 deletion(-)
>
> --- linux.orig/include/linux/memblock.h
> +++ linux/include/linux/memblock.h
> @@ -2,6 +2,8 @@
> #define _LINUX_MEMBLOCK_H
> #ifdef __KERNEL__
>
> +#define MEMBLOCK_ERROR 0
> +
> #ifdef CONFIG_HAVE_MEMBLOCK
> /*
>  * Logical memory blocks.
> @@ -20,7 +22,6 @@
> #include <asm/memblock.h>
>
> #define INIT_MEMBLOCK_REGIONS   128
> -#define MEMBLOCK_ERROR         0
>
> struct memblock_region {
>        phys_addr_t base;
> @@ -160,6 +161,12 @@ static inline unsigned long memblock_reg
> #define __initdata_memblock
> #endif
>
> +#else
> +static inline phys_addr_t memblock_alloc(phys_addr_t size, phys_addr_t
> align)
> +{
> +       return MEMBLOCK_ERROR;
> +}
> +
> #endif /* CONFIG_HAVE_MEMBLOCK */
>
> #endif /* __KERNEL__ */
>

setup_log_buf will pass function pointer, So this one is not needed, right?

Thanks

Yinghai
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