linux-kernel - Re: [PATCH] drm/vc4: Fix bitwise OR versus ternary operator in vc4_plane_mode

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Date:   Fri, 11 Sep 2020 11:30:39 +0200
From:   Maxime Ripard <maxime@...no.tech>
To:     Nathan Chancellor <natechancellor@...il.com>
Cc:     Eric Anholt <eric@...olt.net>,
        Dave Stevenson <dave.stevenson@...pberrypi.com>,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        clang-built-linux@...glegroups.com
Subject: Re: [PATCH] drm/vc4: Fix bitwise OR versus ternary operator in
 vc4_plane_mode_set

On Thu, Sep 10, 2020 at 10:18:32AM -0700, Nathan Chancellor wrote:
> Clang warns:
> 
> drivers/gpu/drm/vc4/vc4_plane.c:901:27: warning: operator '?:' has lower
> precedence than '|'; '|' will be evaluated first
> [-Wbitwise-conditional-parentheses]
>                                 fb->format->has_alpha ?
>                                 ~~~~~~~~~~~~~~~~~~~~~ ^
> drivers/gpu/drm/vc4/vc4_plane.c:901:27: note: place parentheses around
> the '|' expression to silence this warning
>                                 fb->format->has_alpha ?
>                                 ~~~~~~~~~~~~~~~~~~~~~ ^
> drivers/gpu/drm/vc4/vc4_plane.c:901:27: note: place parentheses around
> the '?:' expression to evaluate it first
>                                 fb->format->has_alpha ?
>                                 ~~~~~~~~~~~~~~~~~~~~~~^
> 1 warning generated.
> 
> Add the parentheses as that was clearly intended, otherwise
> SCALER5_CTL2_ALPHA_PREMULT won't be added to the list.
> 
> Fixes: c54619b0bfb3 ("drm/vc4: Add support for the BCM2711 HVS5")
> Link: https://github.com/ClangBuiltLinux/linux/issues/1150
> Signed-off-by: Nathan Chancellor <natechancellor@...il.com>

Applied, thanks!
Maxime

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