linux-kernel - Re: [PATCH] staging: greybus: use inline function for macros

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Message-ID: <alpine.DEB.2.22.394.2303192121170.2867@hadrien>
Date:   Sun, 19 Mar 2023 21:21:53 +0100 (CET)
From:   Julia Lawall <julia.lawall@...ia.fr>
To:     Menna Mahmoud <eng.mennamahmoud.mm@...il.com>
cc:     gregkh@...uxfoundation.org, outreachy@...ts.linux.dev,
        johan@...nel.org, elder@...nel.org, linux-kernel@...r.kernel.org,
        linux-staging@...ts.linux.dev, Julia Lawall <julia.lawall@...ia.fr>
Subject: Re: [PATCH] staging: greybus: use inline function for macros



On Sun, 19 Mar 2023, Menna Mahmoud wrote:

> Convert `to_gbphy_dev` and `to_gbphy_driver` macros into a
> static inline functions.
>
> 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/greybus/gbphy.h | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/greybus/gbphy.h b/drivers/staging/greybus/gbphy.h
> index 1de510499480..42c4e3fe307c 100644
> --- a/drivers/staging/greybus/gbphy.h
> +++ b/drivers/staging/greybus/gbphy.h
> @@ -16,7 +16,10 @@ struct gbphy_device {
>  	struct device dev;
>  };
>

You have made the patch against your previous patch that added a newline
here.  It should be against Greg's tree.

julia

> -#define to_gbphy_dev(d) container_of(d, struct gbphy_device, dev)
> +static inline struct gbphy_device *to_gbphy_dev(const struct device *d)
> +{
> +	return container_of(d, struct gbphy_device, dev);
> +}
>
>  static inline void *gb_gbphy_get_data(struct gbphy_device *gdev)
>  {
> @@ -45,7 +48,10 @@ struct gbphy_driver {
>  	struct device_driver driver;
>  };
>
> -#define to_gbphy_driver(d) container_of(d, struct gbphy_driver, driver)
> +static inline struct gbphy_driver *to_gbphy_driver(struct device_driver *d)
> +{
> +	return container_of(d, struct gbphy_driver, driver);
> +}
>
>  int gb_gbphy_register_driver(struct gbphy_driver *driver,
>  			     struct module *owner, const char *mod_name);
> --
> 2.34.1
>
>