linux-kernel - Re: [PATCH] drm/bridge/synopsys: avoid field overflow warning

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Message-Id: <30e22523-216f-41a9-b931-e90136a45378@app.fastmail.com>
Date: Wed, 09 Apr 2025 09:07:30 +0200
From: "Arnd Bergmann" <arnd@...db.de>
To: "Arnd Bergmann" <arnd@...nel.org>,
 "Andrzej Hajda" <andrzej.hajda@...el.com>,
 "Neil Armstrong" <neil.armstrong@...aro.org>,
 "Robert Foss" <rfoss@...nel.org>,
 "Maarten Lankhorst" <maarten.lankhorst@...ux.intel.com>,
 "Maxime Ripard" <mripard@...nel.org>,
 "Thomas Zimmermann" <tzimmermann@...e.de>, "Dave Airlie" <airlied@...il.com>,
 "Simona Vetter" <simona@...ll.ch>, "Nathan Chancellor" <nathan@...nel.org>,
 "Heiko Stuebner" <heiko.stuebner@...rry.de>,
 "Andy Yan" <andy.yan@...k-chips.com>
Cc: "laurent.pinchart" <Laurent.pinchart@...asonboard.com>,
 "Jonas Karlman" <jonas@...boo.se>,
 "Jernej Skrabec" <jernej.skrabec@...il.com>,
 "Nick Desaulniers" <nick.desaulniers+lkml@...il.com>,
 "Bill Wendling" <morbo@...gle.com>, "Justin Stitt" <justinstitt@...gle.com>,
 "Dmitry Baryshkov" <lumag@...nel.org>,
 "Doug Anderson" <dianders@...omium.org>, dri-devel@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH] drm/bridge/synopsys: avoid field overflow warning

On Tue, Apr 8, 2025, at 19:51, Arnd Bergmann wrote:
> From: Arnd Bergmann <arnd@...db.de>
>
> clang-16 and earlier complain about what it thinks might be an out of
> range number:
>
> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi2.c:348:8: error: call to 
> __compiletime_assert_579 declared with 'error' attribute: FIELD_PREP: 
> value too large for the field
>                      PHY_SYS_RATIO(tmp));
>                      ^
> drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi2.c:90:27: note: expanded 
> from macro 'PHY_SYS_RATIO'
>  #define PHY_SYS_RATIO(x)                FIELD_PREP(GENMASK(16, 0), x)
>

I still see the same build failure in some other configurations even
with this patch. Please disregard this version, I'll try to come
up with a better one.

       Arnd