Hi Shakeel,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on mmotm/master]
[also build test ERROR on v4.16-rc2 next-20180220]
[cannot apply to linus/master]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Shakeel-Butt/Directed-kmem-charging/20180221-071026
base:   git://git.cmpxchg.org/linux-mmotm.git master
config: i386-randconfig-n0-201807 (attached as .config)
compiler: gcc-7 (Debian 7.3.0-1) 7.3.0
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

All errors (new ones prefixed by >>):

   init/initramfs.o: In function `kmalloc_memcg':
>> include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
>> include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   arch/x86/events/core.o: In function `kmalloc_memcg':
>> include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
>> include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   arch/x86/kernel/ksysfs.o: In function `kmalloc_memcg':
>> include/linux/slab.h:588: undefined reference to `__kmalloc_memcg'
   arch/x86/kernel/e820.o:include/linux/slab.h:588: more undefined references to `__kmalloc_memcg' follow

vim +588 include/linux/slab.h

   518	
   519	/**
   520	 * kmalloc - allocate memory
   521	 * @size: how many bytes of memory are required.
   522	 * @flags: the type of memory to allocate.
   523	 *
   524	 * kmalloc is the normal method of allocating memory
   525	 * for objects smaller than page size in the kernel.
   526	 *
   527	 * The @flags argument may be one of:
   528	 *
   529	 * %GFP_USER - Allocate memory on behalf of user.  May sleep.
   530	 *
   531	 * %GFP_KERNEL - Allocate normal kernel ram.  May sleep.
   532	 *
   533	 * %GFP_ATOMIC - Allocation will not sleep.  May use emergency pools.
   534	 *   For example, use this inside interrupt handlers.
   535	 *
   536	 * %GFP_HIGHUSER - Allocate pages from high memory.
   537	 *
   538	 * %GFP_NOIO - Do not do any I/O at all while trying to get memory.
   539	 *
   540	 * %GFP_NOFS - Do not make any fs calls while trying to get memory.
   541	 *
   542	 * %GFP_NOWAIT - Allocation will not sleep.
   543	 *
   544	 * %__GFP_THISNODE - Allocate node-local memory only.
   545	 *
   546	 * %GFP_DMA - Allocation suitable for DMA.
   547	 *   Should only be used for kmalloc() caches. Otherwise, use a
   548	 *   slab created with SLAB_DMA.
   549	 *
   550	 * Also it is possible to set different flags by OR'ing
   551	 * in one or more of the following additional @flags:
   552	 *
   553	 * %__GFP_HIGH - This allocation has high priority and may use emergency pools.
   554	 *
   555	 * %__GFP_NOFAIL - Indicate that this allocation is in no way allowed to fail
   556	 *   (think twice before using).
   557	 *
   558	 * %__GFP_NORETRY - If memory is not immediately available,
   559	 *   then give up at once.
   560	 *
   561	 * %__GFP_NOWARN - If allocation fails, don't issue any warnings.
   562	 *
   563	 * %__GFP_RETRY_MAYFAIL - Try really hard to succeed the allocation but fail
   564	 *   eventually.
   565	 *
   566	 * There are other flags available as well, but these are not intended
   567	 * for general use, and so are not documented here. For a full list of
   568	 * potential flags, always refer to linux/gfp.h.
   569	 */
   570	static __always_inline void *
   571	kmalloc_memcg(size_t size, gfp_t flags, struct mem_cgroup *memcg)
   572	{
   573		if (__builtin_constant_p(size)) {
   574			if (size > KMALLOC_MAX_CACHE_SIZE)
   575				return kmalloc_large_memcg(size, flags, memcg);
   576	#ifndef CONFIG_SLOB
   577			if (!(flags & GFP_DMA)) {
   578				int index = kmalloc_index(size);
   579	
   580				if (!index)
   581					return ZERO_SIZE_PTR;
   582	
   583				return kmem_cache_alloc_memcg_trace(
   584					kmalloc_caches[index], flags, size, memcg);
   585			}
   586	#endif
   587		}
 > 588		return __kmalloc_memcg(size, flags, memcg);
   589	}
   590	

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