linux-kernel - Re: [PATCH] RDMA/qib: Use the bitmap API to allocate bitmaps

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Date:   Mon, 11 Jul 2022 08:08:21 -0400
From:   Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Jason Gunthorpe <jgg@...pe.ca>,
        Leon Romanovsky <leon@...nel.org>
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
        linux-rdma@...r.kernel.org
Subject: Re: [PATCH] RDMA/qib: Use the bitmap API to allocate bitmaps

On 7/8/22 1:20 PM, Christophe JAILLET wrote:
> Use bitmap_zalloc()/bitmap_free() instead of hand-writing them.
> 
> It is less verbose and it improves the semantic.
> 
> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
> ---
>  drivers/infiniband/hw/qib/qib_init.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/infiniband/hw/qib/qib_init.c b/drivers/infiniband/hw/qib/qib_init.c
> index d1a72e89e297..45211008449f 100644
> --- a/drivers/infiniband/hw/qib/qib_init.c
> +++ b/drivers/infiniband/hw/qib/qib_init.c
> @@ -1106,8 +1106,7 @@ struct qib_devdata *qib_alloc_devdata(struct pci_dev *pdev, size_t extra)
>  	if (!qib_cpulist_count) {
>  		u32 count = num_online_cpus();
>  
> -		qib_cpulist = kcalloc(BITS_TO_LONGS(count), sizeof(long),
> -				      GFP_KERNEL);
> +		qib_cpulist = bitmap_zalloc(count, GFP_KERNEL);
>  		if (qib_cpulist)
>  			qib_cpulist_count = count;
>  	}
> @@ -1279,7 +1278,7 @@ static void __exit qib_ib_cleanup(void)
>  #endif
>  
>  	qib_cpulist_count = 0;
> -	kfree(qib_cpulist);
> +	bitmap_free(qib_cpulist);
>  
>  	WARN_ON(!xa_empty(&qib_dev_table));
>  	qib_dev_cleanup();

Looks OK to me.

Reviewed-by: Dennis Dalessandro <dennis.dalessandro@...nelisnetworks.com>