linux-kernel - Re: [PATCH] RDMA/mlx4: Use bitmap

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Date:   Thu, 25 Nov 2021 11:58:19 -0800
From:   Joe Perches <joe@...ches.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        yishaih@...dia.com, selvin.xavier@...adcom.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] RDMA/mlx4: Use bitmap_alloc() when applicable

On Thu, 2021-11-25 at 20:42 +0100, Christophe JAILLET wrote:
> Use 'bitmap_alloc()' to simplify code, improve the semantic and avoid some
> open-coded arithmetic in allocator arguments.
> 
> Also change the corresponding 'kfree()' into 'bitmap_free()' to keep
> consistency.

Thanks.

> diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c
[]
> @@ -2784,10 +2784,8 @@ static void *mlx4_ib_add(struct mlx4_dev *dev)
>  		if (err)
>  			goto err_counter;
>  
> -		ibdev->ib_uc_qpns_bitmap =
> -			kmalloc_array(BITS_TO_LONGS(ibdev->steer_qpn_count),
> -				      sizeof(long),
> -				      GFP_KERNEL);
> +		ibdev->ib_uc_qpns_bitmap = bitmap_alloc(ibdev->steer_qpn_count,
> +							GFP_KERNEL);

I wonder if it'd be simpler/smaller to change this to bitmap_zalloc and
remove the bitmap_zero in the if below.