linux-kernel - Re: [PATCH] drm/print: cleanup coding style in drm

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Date:   Mon, 05 Sep 2022 11:45:34 +0300
From:   Jani Nikula <jani.nikula@...ux.intel.com>
To:     Jingyu Wang <jingyuwang_vip@....com>,
        maarten.lankhorst@...ux.intel.com, mripard@...nel.org,
        tzimmermann@...e.de, airlied@...ux.ie, daniel@...ll.ch
Cc:     Jingyu Wang <jingyuwang_vip@....com>, linux-kernel@...r.kernel.org,
        dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/print: cleanup coding style in drm_print.h

On Mon, 05 Sep 2022, Jingyu Wang <jingyuwang_vip@....com> wrote:
> Fix everything checkpatch.pl complained about in drm_print.h

Sorry, you just can't assume the checkpatch.pl complaints are all
correct, or that it would be this trivial to fix them.

This is broken.

> Signed-off-by: Jingyu Wang <jingyuwang_vip@....com>
> ---
>  include/drm/drm_print.h | 11 ++++++-----
>  1 file changed, 6 insertions(+), 5 deletions(-)
>
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index 22fabdeed297..4332fbeb76a8 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -1,3 +1,4 @@
> +/* SPDX-License-Identifier: MIT */

What's the point of having both the SPDX and full license text in the
header? But unless you're the license holder, I'd be pretty careful
about removing the license text.

>  /*
>   * Copyright (C) 2016 Red Hat
>   *
> @@ -103,7 +104,7 @@ __printf(2, 0)
>   * @va: the va_list
>   */
>  static inline void
> -drm_vprintf(struct drm_printer *p, const char *fmt, va_list *va)
> +drm_vprintf(struct drm_printer *p, const char *fmt, va_list * va)

Checkpatch is just confused here. Look at all the other params, why
would you add an extra space here?

>  {
>  	struct va_format vaf = { .fmt = fmt, .va = va };
>  
> @@ -426,16 +427,16 @@ void drm_dev_dbg(const struct device *dev, enum drm_debug_category category,
>  
>  
>  #define drm_info(drm, fmt, ...)					\
> -	__drm_printk((drm), info,, fmt, ##__VA_ARGS__)
> +	__drm_printk((drm), info, fmt, ##__VA_ARGS__)
>  
>  #define drm_notice(drm, fmt, ...)				\
> -	__drm_printk((drm), notice,, fmt, ##__VA_ARGS__)
> +	__drm_printk((drm), notice, fmt, ##__VA_ARGS__)
>  
>  #define drm_warn(drm, fmt, ...)					\
> -	__drm_printk((drm), warn,, fmt, ##__VA_ARGS__)
> +	__drm_printk((drm), warn, fmt, ##__VA_ARGS__)
>  
>  #define drm_err(drm, fmt, ...)					\
> -	__drm_printk((drm), err,, "*ERROR* " fmt, ##__VA_ARGS__)
> +	__drm_printk((drm), err, "*ERROR* " fmt, ##__VA_ARGS__)

This is macro magic, and that ,, there passes an empty arg. You remove
it completely, shifting all the args to the wrong place, breaking drm
error logging.

BR,
Jani.

>  
>  
>  #define drm_info_once(drm, fmt, ...)				\
>
> base-commit: e47eb90a0a9ae20b82635b9b99a8d0979b757ad8
> prerequisite-patch-id: f039528bc88876d6e0f64e843da089e85f6d3f58
> prerequisite-patch-id: c14ed2e970be2c3f8ba746634e8161b94c148e88

-- 
Jani Nikula, Intel Open Source Graphics Center