linux-kernel - Re: [PATCH 2/2] RDMA/rxe: Use 'bitmap

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Date:   Sun, 24 Oct 2021 19:30:46 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     zyjzyj2000@...il.com, dledford@...hat.com, jgg@...pe.ca
Cc:     linux-rdma@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 2/2] RDMA/rxe: Use 'bitmap_zalloc()' when applicable

Le 24/10/2021 à 18:43, Christophe JAILLET a écrit :
> 'index.table' is a bitmap. So use 'bitmap_zalloc()' to simplify code,
> improve the semantic and avoid some open-coded arithmetic in allocator
> arguments.
> 
> Using 'bitmap_zalloc()' also allows the removal of a now useless
> 'bitmap_zero()'.
> 
> Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
> consistency.
> 
> Finally, while at it, axe the useless 'bitmap' variable and use
> 'mem->bitmap' directly.

This last sentence should not be there (cut'n'paste error)
It should be removed when the patch is applied, or I can resend if needed.

CJ

> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>   drivers/infiniband/sw/rxe/rxe_pool.c | 8 ++------
>   1 file changed, 2 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/infiniband/sw/rxe/rxe_pool.c b/drivers/infiniband/sw/rxe/rxe_pool.c
> index 271d4ac0e0aa..ed2427369c2c 100644
> --- a/drivers/infiniband/sw/rxe/rxe_pool.c
> +++ b/drivers/infiniband/sw/rxe/rxe_pool.c
> @@ -96,7 +96,6 @@ static inline const char *pool_name(struct rxe_pool *pool)
>   static int rxe_pool_init_index(struct rxe_pool *pool, u32 max, u32 min)
>   {
>   	int err = 0;
> -	size_t size;
>   
>   	if ((max - min + 1) < pool->max_elem) {
>   		pr_warn("not enough indices for max_elem\n");
> @@ -107,15 +106,12 @@ static int rxe_pool_init_index(struct rxe_pool *pool, u32 max, u32 min)
>   	pool->index.max_index = max;
>   	pool->index.min_index = min;
>   
> -	size = BITS_TO_LONGS(max - min + 1) * sizeof(long);
> -	pool->index.table = kmalloc(size, GFP_KERNEL);
> +	pool->index.table = bitmap_zalloc(max - min + 1, GFP_KERNEL);
>   	if (!pool->index.table) {
>   		err = -ENOMEM;
>   		goto out;
>   	}
>   
> -	bitmap_zero(pool->index.table, max - min + 1);
> -
>   out:
>   	return err;
>   }
> @@ -167,7 +163,7 @@ void rxe_pool_cleanup(struct rxe_pool *pool)
>   		pr_warn("%s pool destroyed with unfree'd elem\n",
>   			pool_name(pool));
>   
> -	kfree(pool->index.table);
> +	bitmap_free(pool->index.table);
>   }
>   
>   static u32 alloc_index(struct rxe_pool *pool)
>