> in file mm/slab.c and routine kmem_cache_init() I found there
quoted text
> is no checking for allocated memory on line:
> 
> 	/* 4) Replace the bootstrap head arrays */
> 	{
> 		struct array_cache *ptr;
> 
> 		ptr = kmalloc(sizeof(struct arraycache_init), GFP_KERNEL);
> 
> --> no check for ptr == NULL <--
[...]
quoted text
> is that OK? or it's a bug?

It's ok. If that allocation fails your machine won't come up anyway.
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