linux-kernel - Re: [PATCH] staging: rtl8723bs: use inline functions for dev_to_sdio

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Message-ID: <3d433474-93bd-b62c-1de5-7b029b1353f9@gmail.com>
Date:   Mon, 20 Mar 2023 12:46:21 +0200
From:   Menna Mahmoud <eng.mennamahmoud.mm@...il.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     outreachy@...ts.linux.dev, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev, Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCH] staging: rtl8723bs: use inline functions for
 dev_to_sdio_func


On ٢٠‏/٣‏/٢٠٢٣ ١٢:٤٣, Greg KH wrote:
> On Mon, Mar 20, 2023 at 12:34:41PM +0200, Menna Mahmoud wrote:
>> Convert `dev_to_sdio_func` macro into a static inline function.
>> it is not great to have macro that use `container_of` macro,
>> because from looking at the definition one cannot tell
>> what type it applies to.
>>
>> One can get the same benefit from an efficiency point of view
>> by making an inline function.
>>
>> Suggested-by: Julia Lawall <julia.lawall@...ia.fr>
>> Signed-off-by: Menna Mahmoud <eng.mennamahmoud.mm@...il.com>
>> ---
>>   drivers/staging/rtl8723bs/os_dep/sdio_intf.c | 5 ++++-
>>   1 file changed, 4 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/staging/rtl8723bs/os_dep/sdio_intf.c b/drivers/staging/rtl8723bs/os_dep/sdio_intf.c
>> index 490431484524..7ee821dbbae0 100644
>> --- a/drivers/staging/rtl8723bs/os_dep/sdio_intf.c
>> +++ b/drivers/staging/rtl8723bs/os_dep/sdio_intf.c
>> @@ -10,7 +10,10 @@
>>   #include <linux/jiffies.h>
>>   
>>   #ifndef dev_to_sdio_func
>> -#define dev_to_sdio_func(d)     container_of(d, struct sdio_func, dev)
>> +static inline struct sdio_func *dev_to_sdio_func(struct device *d)
>> +{
>> +	return container_of(d, struct sdio_func, dev);
>> +}
>>   #endif
> Why is the "#ifndef" check still needed now?  Really it was never
> needed, but now would be a great time to remove it as it doubly does not
> make any sense here.
>
> Oh wait, no, this whole thing can just be removed entirely, right?
> There already is a dev_to_sdio_func macro defined, so the #ifndef check
> catches that so your change doesn't actually modify any code that is
> used.  So this should all be removed, not changed to an inline function.

yes, got it.


Thanks,

Menna

>
> thanks,
>
> greg k-h