linux-kernel - Re: [PATCH] net/mlx5: Use kasprintf instead of hand-writing it

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Message-ID: <8513235a-eed2-7007-a873-6464df8cb3c9@wanadoo.fr>
Date:   Sun, 18 Apr 2021 23:28:16 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Bart Van Assche <bvanassche@....org>, saeedm@...dia.com,
        leon@...nel.org, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-rdma@...r.kernel.org,
        linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] net/mlx5: Use kasprintf instead of hand-writing it

Le 18/04/2021 à 22:03, Bart Van Assche a écrit :
> On 4/17/21 12:16 AM, Christophe JAILLET wrote:
>> 'kasprintf()' can replace a kmalloc/strcpy/strcat sequence.
>> It is less verbose and avoid the use of a magic number (64).
>>
>> Anyway, the underlying 'alloc_workqueue()' would only keep the 24 first
>> chars (i.e. sizeof(struct workqueue_struct->name) = WQ_NAME_LEN).
>>
>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>> ---
>>   drivers/net/ethernet/mellanox/mlx5/core/health.c | 4 +---
>>   1 file changed, 1 insertion(+), 3 deletions(-)
>>
>> diff --git a/drivers/net/ethernet/mellanox/mlx5/core/health.c b/drivers/net/ethernet/mellanox/mlx5/core/health.c
>> index 9ff163c5bcde..a5383e701b4b 100644
>> --- a/drivers/net/ethernet/mellanox/mlx5/core/health.c
>> +++ b/drivers/net/ethernet/mellanox/mlx5/core/health.c
>> @@ -802,12 +802,10 @@ int mlx5_health_init(struct mlx5_core_dev *dev)
>>   	mlx5_fw_reporters_create(dev);
>>   
>>   	health = &dev->priv.health;
>> -	name = kmalloc(64, GFP_KERNEL);
>> +	name = kasprintf(GFP_KERNEL, "mlx5_health%s", dev_name(dev->device));
>>   	if (!name)
>>   		goto out_err;
>>   
>> -	strcpy(name, "mlx5_health");
>> -	strcat(name, dev_name(dev->device));
>>   	health->wq = create_singlethread_workqueue(name);
>>   	kfree(name);
>>   	if (!health->wq)
> 
> Instead of modifying the mlx5 driver, please change the definition of
> the create_singlethread_workqueue() such that it accept a format
> specifier and a variable number of arguments.
> 

Agreed. I've sent another patch serie which is more elegant.
Thanks for the feedback.

CJ

> Thanks,
> 
> Bart.
> 
> 
>