linux-kernel - Re: [PATCH 01/16] tools: Move gfp.h and slab.h from radix-tree to lib

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Date:   Thu, 27 Jan 2022 13:36:47 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Karolina Drobnik <karolinadrobnik@...il.com>
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        mike.rapoport@...il.com, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 01/16] tools: Move gfp.h and slab.h from radix-tree to lib

On Thu, Jan 27, 2022 at 02:21:19PM +0100, Karolina Drobnik wrote:
> diff --git a/tools/testing/radix-tree/linux.c b/tools/testing/radix-tree/linux.c
> index 2d9c59df60de..81539f543954 100644
> --- a/tools/testing/radix-tree/linux.c
> +++ b/tools/testing/radix-tree/linux.c
> @@ -14,7 +14,6 @@
>  
>  int nr_allocated;
>  int preempt_count;
> -int kmalloc_verbose;
>  int test_verbose;
>  
>  struct kmem_cache {
> @@ -78,32 +77,6 @@ void kmem_cache_free(struct kmem_cache *cachep, void *objp)
>  	pthread_mutex_unlock(&cachep->lock);
>  }
>  
> -void *kmalloc(size_t size, gfp_t gfp)
> -{
> -	void *ret;
> -
> -	if (!(gfp & __GFP_DIRECT_RECLAIM))
> -		return NULL;
> -
> -	ret = malloc(size);
> -	uatomic_inc(&nr_allocated);
> -	if (kmalloc_verbose)
> -		printf("Allocating %p from malloc\n", ret);
> -	if (gfp & __GFP_ZERO)
> -		memset(ret, 0, size);
> -	return ret;
> -}
> -
> -void kfree(void *p)
> -{
> -	if (!p)
> -		return;
> -	uatomic_dec(&nr_allocated);
> -	if (kmalloc_verbose)
> -		printf("Freeing %p to malloc\n", p);
> -	free(p);
> -}
> -
>  struct kmem_cache *
>  kmem_cache_create(const char *name, unsigned int size, unsigned int align,
>  		unsigned int flags, void (*ctor)(void *))

I don't think it makes much sense to move kmalloc() and not to move
the kmem_cache* functions.  They're all provided by slab in the kernel
proper, so while you don't use them, I think keeping all the memory
allocation functions together is preferable.