linux-kernel - Re: [PATCH] drm/amd/display: return 'NULL' instead of 'false' from dcn20_acquire_idle_pipe_for

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Date:   Fri, 12 Jul 2019 10:57:15 -0700
From:   Nathan Chancellor <natechancellor@...il.com>
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>,
        Bhawanpreet Lakha <Bhawanpreet.Lakha@....com>,
        Dmytro Laktyushkin <Dmytro.Laktyushkin@....com>,
        Nikola Cornij <nikola.cornij@....com>,
        Charlene Liu <charlene.liu@....com>, Jun Lei <Jun.Lei@....com>,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org, clang-built-linux@...glegroups.com
Subject: Re: [PATCH] drm/amd/display: return 'NULL' instead of 'false' from
 dcn20_acquire_idle_pipe_for_layer

On Fri, Jul 12, 2019 at 11:39:52AM +0200, Arnd Bergmann wrote:
> clang complains that 'false' is a not a pointer:
> 
> drivers/gpu/drm/amd/amdgpu/../display/dc/dcn20/dcn20_resource.c:2428:10: error: expression which evaluates to zero treated as a null pointer constant of type 'struct pipe_ctx *' [-Werror,-Wnon-literal-null-conversion]
>                 return false;
> 
> Changing it to 'NULL' looks like the right thing that will shut up
> the warning and make it easier to read, while not changing behavior.
> 
> Fixes: 7ed4e6352c16 ("drm/amd/display: Add DCN2 HW Sequencer and Resource")
> Signed-off-by: Arnd Bergmann <arnd@...db.de>

Reviewed-by: Nathan Chancellor <natechancellor@...il.com>