Re: [PATCH v2 2/7] pwm: tegra: Avoid hard-coded max clock frequency
From: kernel test robot
Date: Mon Mar 30 2026 - 10:47:03 EST
Hi Mikko,
kernel test robot noticed the following build warnings:
[auto build test WARNING on 11439c4635edd669ae435eec308f4ab8a0804808]
url: https://github.com/intel-lab-lkp/linux/commits/Mikko-Perttunen/dt-bindings-pwm-Document-Tegra194-and-Tegra264-controllers/20260329-233356
base: 11439c4635edd669ae435eec308f4ab8a0804808
patch link: https://lore.kernel.org/r/20260325-t264-pwm-v2-2-998d885984b3%40nvidia.com
patch subject: [PATCH v2 2/7] pwm: tegra: Avoid hard-coded max clock frequency
config: nios2-allmodconfig (https://download.01.org/0day-ci/archive/20260330/202603302259.NdAkuCVx-lkp@xxxxxxxxx/config)
compiler: nios2-linux-gcc (GCC) 11.5.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260330/202603302259.NdAkuCVx-lkp@xxxxxxxxx/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@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603302259.NdAkuCVx-lkp@xxxxxxxxx/
All warnings (new ones prefixed by >>):
In file included from include/linux/kernel.h:17,
from include/linux/clk.h:13,
from drivers/pwm/pwm-tegra.c:39:
drivers/pwm/pwm-tegra.c: In function 'tegra_pwm_probe':
>> include/linux/limits.h:26:25: warning: unsigned conversion from 'long long int' to 'long unsigned int' changes value from '9223372036854775807' to '4294967295' [-Woverflow]
26 | #define S64_MAX ((s64)(U64_MAX >> 1))
| ^~~~~~~~~~~~~~~~~~~~~
drivers/pwm/pwm-tegra.c:303:47: note: in expansion of macro 'S64_MAX'
303 | ret = dev_pm_opp_set_rate(&pdev->dev, S64_MAX);
| ^~~~~~~
vim +26 include/linux/limits.h
3c9d017cc283df Andy Shevchenko 2023-08-04 14
54d50897d544c8 Masahiro Yamada 2019-03-07 15 #define U8_MAX ((u8)~0U)
54d50897d544c8 Masahiro Yamada 2019-03-07 16 #define S8_MAX ((s8)(U8_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 17 #define S8_MIN ((s8)(-S8_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 18 #define U16_MAX ((u16)~0U)
54d50897d544c8 Masahiro Yamada 2019-03-07 19 #define S16_MAX ((s16)(U16_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 20 #define S16_MIN ((s16)(-S16_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 21 #define U32_MAX ((u32)~0U)
3f50f132d8400e John Fastabend 2020-03-30 22 #define U32_MIN ((u32)0)
54d50897d544c8 Masahiro Yamada 2019-03-07 23 #define S32_MAX ((s32)(U32_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 24 #define S32_MIN ((s32)(-S32_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 25 #define U64_MAX ((u64)~0ULL)
54d50897d544c8 Masahiro Yamada 2019-03-07 @26 #define S64_MAX ((s64)(U64_MAX >> 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 27 #define S64_MIN ((s64)(-S64_MAX - 1))
54d50897d544c8 Masahiro Yamada 2019-03-07 28
--
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https://github.com/intel/lkp-tests/wiki