linux-kernel - Re: [PATCH] drm/i915/display: Include debugfs.h in intel_display_debugfs

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Date: Thu, 1 Feb 2024 14:58:56 +0000
From: Paz Zcharya <pazz@...omium.org>
To: Jani Nikula <jani.nikula@...el.com>
Cc: Jouni Högander <jouni.hogander@...el.com>,
	Luca Coelho <luciano.coelho@...el.com>,
	Subrata Banik <subratabanik@...gle.com>,
	Manasi Navare <navaremanasi@...omium.org>,
	Drew Davenport <ddavenport@...omium.org>,
	Sean Paul <seanpaul@...omium.org>,
	Marcin Wojtas <mwojtas@...omium.org>, khaled.almahallawy@...el.com,
	intel-gfx@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: [PATCH] drm/i915/display: Include debugfs.h in
 intel_display_debugfs_params.c

On Thu, Feb 01, 2024 at 11:22:16AM +0200, Jani Nikula wrote:
> On Wed, 31 Jan 2024, Paz Zcharya <pazz@...omium.org> wrote:
> > Commit 8015bee0bfec ("drm/i915/display: Add framework to add parameters
> > specific to display") added the file intel_display_debugfs_params.c,
> > which calls the functions "debugfs_create_{bool, ulong, str}" -- all of
> > which are defined in <linux/debugfs.h>. The missing inclusion of this
> > header file is breaking the ChromeOS build -- add an explicit include
> > to fix that.
> >
> 
> Thanks for the patch, apparently in our configs some paths lead to
> debugfs.h. Just goes on to show how interdependent the kernel headers
> are.
> 
> Out of curiousity, what value do you have for CONFIG_DEBUG_FS kconfig?
> 
> Fixes: 8015bee0bfec ("drm/i915/display: Add framework to add parameters specific to display")
> Reviewed-by: Jani Nikula <jani.nikula@...el.com>
> 
> BR,
> Jani.
> 
Thank you so much for the super prompt reply!

In ChromeOS the value is CONFIG_DEBUG_FS=y.

Best,
Paz
> 
> > Signed-off-by: Paz Zcharya <pazz@...omium.org>
> > ---
> >  drivers/gpu/drm/i915/display/intel_display_debugfs_params.c | 1 +
> >  1 file changed, 1 insertion(+)
> >
> > diff --git a/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c b/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c
> > index b7e68eb62452..f35718748555 100644
> > --- a/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c
> > +++ b/drivers/gpu/drm/i915/display/intel_display_debugfs_params.c
> > @@ -3,6 +3,7 @@
> >   * Copyright © 2023 Intel Corporation
> >   */
> >  
> > +#include <linux/debugfs.h>
> >  #include <linux/kernel.h>
> >  
> >  #include <drm/drm_drv.h>
> 
> -- 
> Jani Nikula, Intel