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

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Date:	Thu, 31 Mar 2011 08:23:51 -0700
From:	Mike Travis <travis@....com>
To:	Yinghai Lu <yinghai@...nel.org>
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



Yinghai Lu wrote:
> 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?

The other function would need the #ifdef CONFIG_HAVE_MEMBLOCK before calling
memblock_alloc which I thought was the point of this patch?  Note we still
have the last fallback of using alloc_boot_mem in kernel/init.c.

Thanks,
Mike
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