linux-kernel - Re: [PATCH 2.6.18 ] LIB Add gen_pool

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Date:	Wed, 27 Sep 2006 16:09:40 -0500
From:	Steve Wise <swise@...ngridcomputing.com>
To:	Dean Nelson <dcn@....com>
Cc:	jes@...ined-monkey.org, avolkov@...ma-el.com, rdunlap@...otime.net,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2.6.18 ] LIB Add gen_pool_destroy().

Dean,

Looks like it works fine.

Any chance of getting this into 2.6.18 I wonder?


Steve.



On Wed, 2006-09-27 at 14:51 -0500, Dean Nelson wrote:
> Modules using the genpool allocator need to be able to destroy the data
> structure when unloading.
> 
> Signed-off-by: Steve Wise <swise@...ngridcomputing.com>
> Signed-off-by: Dean Nelson <dcn@....com>
> 
> ---
> 
> Hi Steve,
> 
> I agree that the ability to destroy the allocated structures is
> necessary. Thanks for doing the work. I do think it appropriate
> to ensure that there are no outstanding allocations (to avoid use
> after free issues) and have added that check in this new patch.
> This patch has not been tested, though it does compile. I don't
> have the time today. I hope you don't mind testing it? :-)
> 
> It also looks like I need to straighten out the kernel-doc
> aspects of this file. I'll tackle that as a separate patch.
> 
> Thanks,
> Dean
> 
> 
>  include/linux/genalloc.h |    1 +
>  lib/genalloc.c           |   29 +++++++++++++++++++++++++++++
>  2 files changed, 30 insertions(+)
> 
> 
> Index: linux-2.6/lib/genalloc.c
> ===================================================================
> --- linux-2.6.orig/lib/genalloc.c	2006-09-27 13:42:35.000000000 -0500
> +++ linux-2.6/lib/genalloc.c	2006-09-27 14:31:56.816523882 -0500
> @@ -71,6 +71,35 @@
>  
> 
>  /*
> + * Destroy a memory pool.
> + *
> + * @pool: pool to destroy
> + */
> +void gen_pool_destroy(struct gen_pool *pool)
> +{
> +	struct list_head *_chunk, *_next_chunk;
> +	struct gen_pool_chunk *chunk;
> +	int order = pool->min_alloc_order;
> +	int bit, end_bit;
> +
> +
> +	write_lock(&pool->lock);
> +	list_for_each_safe(_chunk, _next_chunk, &pool->chunks) {
> +		chunk = list_entry(_chunk, struct gen_pool_chunk, next_chunk);
> +
> +		end_bit = (chunk->end_addr - chunk->start_addr) >> order;
> +		bit = find_next_bit(chunk->bits, end_bit, 0);
> +		BUG_ON(bit < end_bit);
> +
> +		kfree(chunk);
> +	}
> +	kfree(pool);
> +	return;
> +}
> +EXPORT_SYMBOL(gen_pool_destroy);
> +
> +
> +/*
>   * Allocate the requested number of bytes from the specified pool.
>   * Uses a first-fit algorithm.
>   *
> Index: linux-2.6/include/linux/genalloc.h
> ===================================================================
> --- linux-2.6.orig/include/linux/genalloc.h	2006-09-27 13:42:34.000000000 -0500
> +++ linux-2.6/include/linux/genalloc.h	2006-09-27 14:18:31.807816652 -0500
> @@ -31,5 +31,6 @@
>  
>  extern struct gen_pool *gen_pool_create(int, int);
>  extern int gen_pool_add(struct gen_pool *, unsigned long, size_t, int);
> +extern void gen_pool_destroy(struct gen_pool *);
>  extern unsigned long gen_pool_alloc(struct gen_pool *, size_t);
>  extern void gen_pool_free(struct gen_pool *, unsigned long, size_t);
> -
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