linux-kernel - Re: [PATCH] drm: Reduce object size of DRM_ERROR and DRM

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Date:   Thu, 15 Mar 2018 07:48:30 -0700
From:   Joe Perches <joe@...ches.com>
To:     Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Gustavo Padovan <gustavo@...ovan.org>,
        Sean Paul <seanpaul@...omium.org>,
        David Airlie <airlied@...ux.ie>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>
Cc:     dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org
Subject: Re: [PATCH] drm: Reduce object size of DRM_ERROR and DRM_DEBUG uses

On Thu, 2018-03-15 at 14:22 +0100, Maarten Lankhorst wrote:
> Op 13-03-18 om 23:02 schreef Joe Perches:
> > drm_printk is used for both DRM_ERROR and DRM_DEBUG with unnecessary
> > arguments that can be removed by creating separate functins.
> > 
> > Create specific functions for these calls to reduce x86/64 defconfig
> > size by ~20k.
> > 
> > Modify the existing macros to use the specific calls.
> > 
> > new:
> > $ size -t drivers/gpu/drm/built-in.a | tail -1
> > 1876562	  44542	    995	1922099	 1d5433	(TOTALS)
> > 
> > old:
> > $ size -t drivers/gpu/drm/built-in.a | tail -1
> > 1897565	  44542	    995	1943102	 1da63e	(TOTALS)
[]
> I guess this adds up. Nice reduction. :)

Yup. 1% of all drm object code.

> > diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
[]
> >  
> > -	drm_printk(level, category, "mismatch in %s %pV", name, &vaf);
> > +	if (adjust)
> > +		drm_dbg(DRM_UT_KMS, "mismatch in %s %pV", name, &vaf);
> > +	else
> > +		drm_err("mismatch in %s %pV", name, &vaf);
> 
> Could this use DRM_DEBUG_KMS/DRM_ERROR?
> 
> Rest looks good, so I can fix up if you want.

If want you change something like that, it should be separate patch.

btw: There was  separate patch that also reduced object size
of the drm_dev_printk calls several months ago.  Never applied.

https://lkml.org/lkml/2017/9/25/247

cheers, Joe