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

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Date:   Sun, 19 Mar 2023 22:26:58 +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
Subject: Re: [PATCH] staging: greybus: use inline function for macros



On Sun, 19 Mar 2023, Menna Mahmoud wrote:

>
> On ١٩/٣/٢٠٢٣ ٢٢:٥٥, Julia Lawall wrote:
> >
> > On Sun, 19 Mar 2023, Menna Mahmoud wrote:
> >
> > > On ١٩/٣/٢٠٢٣ ٢٢:٢١, Julia Lawall wrote:
> > > > 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
> > > you mean I should remove this newline, right?
> > You should apply your change to the state of Greg's tree, not the state
> > after your patch.
> >
> > Assuming that you have committed both the patch adding the new line and
> > the patch changing the macro to a function, and have made no other
> > changes, you can do git rebase -i HEAD~2 and the put a d at the beginning
> > of the line related to the patch adding the newline.
>
>
> you mean drop this patch "staging: greybus: remove unnecessary blank line"?

No, the one that removes the blank line looks fine.

At some point, you added a blank line below the two structure definitions.
That blank line is not in Greg's tree, so you shoulsn't send a patch that
assumes that it is there.

julia

>
> Menna
>
>
> > If you have made
> > more changes, you can adapt the HEAD~ part accordingly.
> >
> > julia
> >
> >
> > >
> > > Menna
> > >
> > > > > -#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
> > > > >
> > > > >
> > >
>