linux-kernel - Re: [PATCH] drm/modes: tag unused variables to avoid warnings

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Date:   Tue, 7 Jan 2020 14:24:45 +0100
From:   Thomas Zimmermann <tzimmermann@...e.de>
To:     Benjamin Gaignard <benjamin.gaignard@...com>,
        jani.nikula@...ux.intel.com, maarten.lankhorst@...ux.intel.com,
        mripard@...nel.org, sean@...rly.run, airlied@...ux.ie,
        daniel@...ll.ch, yakui.zhao@...el.com
Cc:     linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/modes: tag unused variables to avoid warnings

Hi

Am 10.12.19 um 11:24 schrieb Benjamin Gaignard:
> Some variables are set but never used. To avoid warning when compiling
> with W=1 and keep the algorithm like it is tag theses variables
> with _maybe_unused macro.
> 
> Signed-off-by: Benjamin Gaignard <benjamin.gaignard@...com>

Acked-by: Thomas Zimmermann <tzimmermann@...e.de>

> ---
> changes in this version:
> - do not modify the code to remove the unused variables
>   just prefix them with __maybe_unused macro.
>   
>  drivers/gpu/drm/drm_modes.c | 9 +++++----
>  1 file changed, 5 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
> index 88232698d7a0..70aed4e2990d 100644
> --- a/drivers/gpu/drm/drm_modes.c
> +++ b/drivers/gpu/drm/drm_modes.c
> @@ -233,7 +233,7 @@ struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
>  		/* 3) Nominal HSync width (% of line period) - default 8 */
>  #define CVT_HSYNC_PERCENTAGE	8
>  		unsigned int hblank_percentage;
> -		int vsyncandback_porch, vback_porch, hblank;
> +		int vsyncandback_porch, __maybe_unused vback_porch, hblank;
>  
>  		/* estimated the horizontal period */
>  		tmp1 = HV_FACTOR * 1000000  -
> @@ -386,9 +386,10 @@ drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
>  	int top_margin, bottom_margin;
>  	int interlace;
>  	unsigned int hfreq_est;
> -	int vsync_plus_bp, vback_porch;
> -	unsigned int vtotal_lines, vfieldrate_est, hperiod;
> -	unsigned int vfield_rate, vframe_rate;
> +	int vsync_plus_bp, __maybe_unused vback_porch;
> +	unsigned int vtotal_lines, __maybe_unused vfieldrate_est;
> +	unsigned int __maybe_unused hperiod;
> +	unsigned int vfield_rate, __maybe_unused vframe_rate;
>  	int left_margin, right_margin;
>  	unsigned int total_active_pixels, ideal_duty_cycle;
>  	unsigned int hblank, total_pixels, pixel_freq;
> 

-- 
Thomas Zimmermann
Graphics Driver Developer
SUSE Software Solutions Germany GmbH
Maxfeldstr. 5, 90409 Nürnberg, Germany
(HRB 36809, AG Nürnberg)
Geschäftsführer: Felix Imendörffer



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