linux-kernel - Re: [PATCH 04/26] drm/print: Add drm_err

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Message-ID: <20190813130417.GU7444@phenom.ffwll.local>
Date:   Tue, 13 Aug 2019 15:04:17 +0200
From:   Daniel Vetter <daniel@...ll.ch>
To:     Lyude Paul <lyude@...hat.com>
Cc:     dri-devel@...ts.freedesktop.org, Juston Li <juston.li@...el.com>,
        Imre Deak <imre.deak@...el.com>,
        Ville Syrjälä 
        <ville.syrjala@...ux.intel.com>, Harry Wentland <hwentlan@....com>,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <maxime.ripard@...tlin.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/26] drm/print: Add drm_err_printer()

On Wed, Jul 17, 2019 at 09:42:27PM -0400, Lyude Paul wrote:
> A simple convienence function that returns a drm_printer which prints
> using pr_err()
> 
> Cc: Juston Li <juston.li@...el.com>
> Cc: Imre Deak <imre.deak@...el.com>
> Cc: Ville Syrjälä <ville.syrjala@...ux.intel.com>
> Cc: Harry Wentland <hwentlan@....com>
> Signed-off-by: Lyude Paul <lyude@...hat.com>
> ---
>  drivers/gpu/drm/drm_print.c |  6 ++++++
>  include/drm/drm_print.h     | 17 +++++++++++++++++
>  2 files changed, 23 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_print.c b/drivers/gpu/drm/drm_print.c
> index a17c8a14dba4..6112be358769 100644
> --- a/drivers/gpu/drm/drm_print.c
> +++ b/drivers/gpu/drm/drm_print.c
> @@ -147,6 +147,12 @@ void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf)
>  }
>  EXPORT_SYMBOL(__drm_printfn_debug);
>  
> +void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf)
> +{
> +	pr_err("%s %pV", p->prefix, vaf);

DRM printing is a huge bikeshad (or tire fire?). We can't call DRM_ERROR,
but for consistency mabye emulate the layout?

Either way: Reviewed-by: Daniel Vetter <daniel.vetter@...ll.ch>


> +}
> +EXPORT_SYMBOL(__drm_printfn_err);
> +
>  /**
>   * drm_puts - print a const string to a &drm_printer stream
>   * @p: the &drm printer
> diff --git a/include/drm/drm_print.h b/include/drm/drm_print.h
> index a5d6f2f3e430..112165d3195d 100644
> --- a/include/drm/drm_print.h
> +++ b/include/drm/drm_print.h
> @@ -83,6 +83,7 @@ void __drm_printfn_seq_file(struct drm_printer *p, struct va_format *vaf);
>  void __drm_puts_seq_file(struct drm_printer *p, const char *str);
>  void __drm_printfn_info(struct drm_printer *p, struct va_format *vaf);
>  void __drm_printfn_debug(struct drm_printer *p, struct va_format *vaf);
> +void __drm_printfn_err(struct drm_printer *p, struct va_format *vaf);
>  
>  __printf(2, 3)
>  void drm_printf(struct drm_printer *p, const char *f, ...);
> @@ -227,6 +228,22 @@ static inline struct drm_printer drm_debug_printer(const char *prefix)
>  	return p;
>  }
>  
> +/**
> + * drm_err_printer - construct a &drm_printer that outputs to pr_err()
> + * @prefix: debug output prefix
> + *
> + * RETURNS:
> + * The &drm_printer object
> + */
> +static inline struct drm_printer drm_err_printer(const char *prefix)
> +{
> +	struct drm_printer p = {
> +		.printfn = __drm_printfn_err,
> +		.prefix = prefix
> +	};
> +	return p;
> +}
> +
>  /*
>   * The following categories are defined:
>   *
> -- 
> 2.21.0
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch