linux-kernel - Re: [PATCH 2/2] drm/meson: vclk: fix precision in vclk calculations

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Message-ID: <794bf229-df4a-41f3-a8a4-8b1362eb7f04@linaro.org>
Date: Mon, 24 Feb 2025 09:52:06 +0100
From: Neil Armstrong <neil.armstrong@...aro.org>
To: kernel test robot <lkp@...el.com>,
 Christian Hewitt <christianshewitt@...il.com>,
 Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
 Maxime Ripard <mripard@...nel.org>, Thomas Zimmermann <tzimmermann@...e.de>,
 David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
 Kevin Hilman <khilman@...libre.com>, Jerome Brunet <jbrunet@...libre.com>,
 Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
 Jernej Skrabec <jernej.skrabec@...il.com>, dri-devel@...ts.freedesktop.org,
 linux-amlogic@...ts.infradead.org, linux-arm-kernel@...ts.infradead.org,
 linux-kernel@...r.kernel.org
Cc: oe-kbuild-all@...ts.linux.dev
Subject: Re: [PATCH 2/2] drm/meson: vclk: fix precision in vclk calculations

Hi,

On 20/01/2025 22:56, kernel test robot wrote:
> Hi Christian,
> 
> kernel test robot noticed the following build errors:
> 
> [auto build test ERROR on linus/master]
> [also build test ERROR on v6.13 next-20250120]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 
> url:    https://github.com/intel-lab-lkp/linux/commits/Christian-Hewitt/Revert-drm-meson-vclk-fix-calculation-of-59-94-fractional-rates/20250110-154701
> base:   linus/master
> patch link:    https://lore.kernel.org/r/20250110074458.3624094-3-christianshewitt%40gmail.com
> patch subject: [PATCH 2/2] drm/meson: vclk: fix precision in vclk calculations
> config: arm-randconfig-r072-20250118 (https://download.01.org/0day-ci/archive/20250121/202501210513.GCec6kts-lkp@intel.com/config)
> compiler: clang version 20.0.0git (https://github.com/llvm/llvm-project c23f2417dc5f6dc371afb07af5627ec2a9d373a0)
> reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250121/202501210513.GCec6kts-lkp@intel.com/reproduce)
> 
> If you fix the issue in a separate patch/commit (i.e. not just a new version of
> the same patch/commit), kindly add following tags
> | Reported-by: kernel test robot <lkp@...el.com>
> | Closes: https://lore.kernel.org/oe-kbuild-all/202501210513.GCec6kts-lkp@intel.com/
> 
> All errors (new ones prefixed by >>, old ones prefixed by <<):
> 
> WARNING: modpost: missing MODULE_DESCRIPTION() in arch/arm/probes/kprobes/test-kprobes.o
> WARNING: modpost: missing MODULE_DESCRIPTION() in lib/slub_kunit.o
> WARNING: modpost: missing MODULE_DESCRIPTION() in drivers/staging/gpib/fmh_gpib/fmh_gpib.o
>>> ERROR: modpost: "__aeabi_uldivmod" [drivers/gpu/drm/meson/meson-drm.ko] undefined!
> 

Please use do_div() when dividing 64bit numbers to please 32-bit platforms.

Neil