linux-kernel - Re: [PATCH v2] Staging: greybus: Cleanup in greybus driver

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Date:   Wed, 17 Apr 2019 08:25:18 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Madhumitha Prabakaran <madhumithabiw@...il.com>
Cc:     johan@...nel.org, elder@...nel.org, greybus-dev@...ts.linaro.org,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] Staging: greybus: Cleanup in greybus driver

On Tue, Apr 16, 2019 at 05:13:18PM -0500, Madhumitha Prabakaran wrote:
> Fix a blank line after structure declarations. Also, convert
> macros into inline functions in order to maintain Linux kernel
> coding style based on which the inline function is
> preferable over the macro.
> 
> Blank line fixes are suggested by checkpatch.pl
> 
> Signed-off-by: Madhumitha Prabakaran <madhumithabiw@...il.com>
> 
> Changes in v2:
> - To maintain consistency in driver greybus, all the instances of macro
> with container_of are fixed in a single patch.
> ---
>  drivers/staging/greybus/bundle.h    |  6 +++++-
>  drivers/staging/greybus/control.h   |  6 +++++-
>  drivers/staging/greybus/gbphy.h     | 12 ++++++++++--
>  drivers/staging/greybus/greybus.h   |  6 +++++-
>  drivers/staging/greybus/hd.h        |  6 +++++-
>  drivers/staging/greybus/interface.h |  6 +++++-
>  drivers/staging/greybus/module.h    |  6 +++++-
>  drivers/staging/greybus/svc.h       |  6 +++++-
>  8 files changed, 45 insertions(+), 9 deletions(-)
> 
> diff --git a/drivers/staging/greybus/bundle.h b/drivers/staging/greybus/bundle.h
> index 8734d2055657..84956eedb1c4 100644
> --- a/drivers/staging/greybus/bundle.h
> +++ b/drivers/staging/greybus/bundle.h
> @@ -31,7 +31,11 @@ struct gb_bundle {
>  
>  	struct list_head	links;	/* interface->bundles */
>  };
> -#define to_gb_bundle(d) container_of(d, struct gb_bundle, dev)
> +
> +static inline struct gb_bundle *to_gb_bundle(struct device *d)
> +{
> +	return container_of(d, struct gb_bundle, dev);
> +}

Why are we changing this to an inline function?  The #define is fine,
and how we "normally" do this type of container_of conversion.

I understand the objection of the "no blank line", but this was the
"original" style that we used to create these #defines from the very
beginning of the driver model work a decade ago.  Changing that
muscle-memory is going to be hard for some of us.  Look at
drivers/base/base.h for other examples of this.

thanks,

greg k-h