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

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Date:   Mon, 20 Mar 2023 11:43:00 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Menna Mahmoud <eng.mennamahmoud.mm@...il.com>
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 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.

thanks,

greg k-h