linux-kernel - Re: [PATCH 4/4 v2] firmware: stratix10-svc: Slightly simplify code

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Date:   Fri, 1 May 2020 11:55:22 -0500
From:   Richard Gong <richard.gong@...ux.intel.com>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        gregkh@...uxfoundation.org, atull@...nel.org
Cc:     linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: Re: [PATCH 4/4 v2] firmware: stratix10-svc: Slightly simplify code

Hi,

On 5/1/20 10:48 AM, Christophe JAILLET wrote:
> Le 01/05/2020 à 17:40, Richard Gong a écrit :
>> Hi,
>>
>> On 4/29/20 1:52 AM, Christophe JAILLET wrote:
>>> Replace 'devm_kmalloc_array(... | __GFP_ZERO)' with the equivalent and
>>> shorter 'devm_kcalloc(...)'.
>>>
>> It doesn't make much sense.
>> Actually devm_kcalloc returns devm_kmalloc_array(.., flag | __GFP_ZERO).
>>
> The only goal is to have a sightly less verbose code.
> This saves one line of code and there is no need to wonder why we 
> explicitly pass __GFP_ZERO to kmalloc_array.
> 
> Mostly a matter of taste.
I prefer this part remain unchanged.

Regards,
Richard

> 
> 'devm_kcalloc' is inlined, so the binary should be exactly the same. >
> CJ
> 
>>> 'ctrl->genpool' can not be NULL, so axe a useless test in the remove
>>> function.
>>>
>>> Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
>>> ---
>>>   drivers/firmware/stratix10-svc.c | 6 ++----
>>>   1 file changed, 2 insertions(+), 4 deletions(-)
>>>
>>> diff --git a/drivers/firmware/stratix10-svc.c 
>>> b/drivers/firmware/stratix10-svc.c
>>> index 739004398877..c228337cb0a1 100644
>>> --- a/drivers/firmware/stratix10-svc.c
>>> +++ b/drivers/firmware/stratix10-svc.c
>>> @@ -1002,8 +1002,7 @@ static int stratix10_svc_drv_probe(struct 
>>> platform_device *pdev)
>>>       if (!controller)
>>>           return -ENOMEM;
>>>   -    chans = devm_kmalloc_array(dev, SVC_NUM_CHANNEL,
>>> -                   sizeof(*chans), GFP_KERNEL | __GFP_ZERO);
>>> +    chans = devm_kcalloc(dev, SVC_NUM_CHANNEL, sizeof(*chans), 
>>> GFP_KERNEL);
>>>       if (!chans)
>>>           return -ENOMEM;
>>>   @@ -1086,8 +1085,7 @@ static int stratix10_svc_drv_remove(struct 
>>> platform_device *pdev)
>>>           kthread_stop(ctrl->task);
>>>           ctrl->task = NULL;
>>>       }
>>> -    if (ctrl->genpool)
>>> -        gen_pool_destroy(ctrl->genpool);
>>> +    gen_pool_destroy(ctrl->genpool);
>>>       list_del(&ctrl->node);
>>>         return 0;
>>>
>>
>> Regards,
>> Richard
>>
>