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

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Date:   Sat, 2 May 2020 10:49:05 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     Richard Gong <richard.gong@...ux.intel.com>,
        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

Le 01/05/2020 à 18:55, Richard Gong a écrit :
> 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.
>

The easiest would be just to ignore this patch entirely but if you need 
a v3 for the series, could you tell me if you have any comments on the 3 
other patches?

CJ


> 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
>>>
>>
>