linux-kernel - Re: [PATCH] drm/amd/display: include missing linux/delay.h

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Date:   Mon, 17 Jun 2019 16:41:09 +0200
From:   Sam Ravnborg <sam@...nborg.org>
To:     Arnd Bergmann <arnd@...db.de>
Cc:     Harry Wentland <harry.wentland@....com>,
        Leo Li <sunpeng.li@....com>,
        Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "David (ChunMing) Zhou" <David1.Zhou@....com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Thomas Lim <Thomas.Lim@....com>,
        Eric Yang <eric.yang2@....com>,
        Charlene Liu <charlene.liu@....com>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        linux-kernel@...r.kernel.org, amd-gfx@...ts.freedesktop.org,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        dri-devel@...ts.freedesktop.org, Tony Cheng <tony.cheng@....com>,
        Anthony Koo <Anthony.Koo@....com>
Subject: Re: [PATCH] drm/amd/display: include missing linux/delay.h

Hi Arnd.

On Mon, Jun 17, 2019 at 02:38:55PM +0200, Arnd Bergmann wrote:
> Some randconfig builds fail to compile the dcn10 code because of
> a missing declaration:
> 
> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c: In function 'dcn10_apply_ctx_for_surface':
> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_hw_sequencer.c:2378:3: error: implicit declaration of function 'udelay' [-Werror=implicit-function-declaration]
> 
> Include the appropriate kernel header.
> 
> Fixes: 9ed43ef84d9d ("drm/amd/display: Add Underflow Asserts to dc")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>
> ---
>  drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
> index 1ac9a4f03990..d87ddc7de9c6 100644
> --- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
> +++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_hw_sequencer.c
> @@ -22,6 +22,7 @@
>   * Authors: AMD
>   *
>   */
> +#include <linux/delay.h>
>  
>  #include <linux/delay.h>
>  #include "dm_services.h"

Something has gone wrong here, as you add a second include of linux/delay.h.

We had this problem before, which Alex fixed by applying a patch to
include linux/delay.h


	Sam