linux-kernel - Re: [PATCH] slab: fix caller tracking on !CONFIG_DEBUG_SLAB && CONFIG

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Date:	Fri, 09 Apr 2010 14:28:59 +0800
From:	Xiaotian Feng <dfeng@...hat.com>
To:	David Rientjes <rientjes@...gle.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	Christoph Lameter <cl@...ux-foundation.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Matt Mackall <mpm@...enic.com>,
	Vegard Nossum <vegard.nossum@...il.com>,
	Dmitry Monakhov <dmonakhov@...nvz.org>,
	Catalin Marinas <catalin.marinas@....com>
Subject: Re: [PATCH] slab: fix caller tracking on !CONFIG_DEBUG_SLAB && CONFIG_TRACING

On 04/09/2010 03:12 AM, David Rientjes wrote:
> On Thu, 8 Apr 2010, Xiaotian Feng wrote:
>
>> diff --git a/include/linux/slab.h b/include/linux/slab.h
>> index 4884462..1a0625c 100644
>> --- a/include/linux/slab.h
>> +++ b/include/linux/slab.h
>> @@ -267,7 +267,7 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
>>    * allocator where we care about the real place the memory allocation
>>    * request comes from.
>>    */
>> -#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB)
>> +#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || defined(CONFIG_TRACING)
>>   extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
>>   #define kmalloc_track_caller(size, flags) \
>>   	__kmalloc_track_caller(size, flags, _RET_IP_)
>> @@ -285,7 +285,7 @@ extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
>>    * standard allocator where we care about the real place the memory
>>    * allocation request comes from.
>>    */
>> -#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB)
>> +#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || defined(CONFIG_TRACING)
>>   extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
>>   #define kmalloc_node_track_caller(size, flags, node) \
>>   	__kmalloc_node_track_caller(size, flags, node, \
>
> This doesn't work if the underlying slab allocator doesn't define
> __kmalloc_node_track_caller() regardless of whether CONFIG_TRACING is
> enabled or not.  SLOB, for example, never defines it, and that's why the
> conditional exists in the way it currently does.
>

Sorry, I didn't realized this, can we use (defined(CONFIG_TRACING) && 
defined(CONFIG_SLAB)) ?

> This is your patch with CONFIG_EMBEDDED&&  CONFIG_SLOB:
>
> mm/built-in.o: In function `__krealloc':
> (.text+0x1283c): undefined reference to `__kmalloc_track_caller'
> mm/built-in.o: In function `kmemdup':
> (.text+0x128b4): undefined reference to `__kmalloc_track_caller'
> mm/built-in.o: In function `kstrndup':
> (.text+0x128fc): undefined reference to `__kmalloc_track_caller'
> mm/built-in.o: In function `kstrdup':
> (.text+0x12943): undefined reference to `__kmalloc_track_caller'
> mm/built-in.o: In function `memdup_user':
> (.text+0x129f7): undefined reference to `__kmalloc_track_caller'
> drivers/built-in.o:(.text+0xc48a4): more undefined references to `__kmalloc_track_caller' follow
> net/built-in.o: In function `__alloc_skb':
> (.text+0x8dc6): undefined reference to `__kmalloc_node_track_caller'
>

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