Re: [PATCH v2 2/7] pwm: tegra: Avoid hard-coded max clock frequency

[kernel test robot <lkp@intel.com>]

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@intel.com/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@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@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202603302259.NdAkuCVx-lkp@intel.com/

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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