RE: [PATCH 15/15] rtw89: 8852c: add 8852ce to Makefile and Kconfig

[Pkshih <pkshih@realtek.com>]

> -----Original Message-----
> From: kernel test robot <lkp@intel.com>
> Sent: Friday, April 29, 2022 8:46 AM
> To: Pkshih <pkshih@realtek.com>; kvalo@kernel.org
> Cc: llvm@lists.linux.dev; kbuild-all@lists.01.org; linux-wireless@vger.kernel.org
> Subject: Re: [PATCH 15/15] rtw89: 8852c: add 8852ce to Makefile and Kconfig
> 
> Hi Ping-Ke,
> 
> I love your patch! Perhaps something to improve:
> 
> [auto build test WARNING on wireless-next/main]
> [also build test WARNING on next-20220428]
> [cannot apply to wireless/main v5.18-rc4]
> [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]
> 
> url:
> https://github.com/intel-lab-lkp/linux/commits/Ping-Ke-Shih/rtw89-8852c-add-RFK-and-then-enable-8852ce
> -in-Makefile-and-Kconfig/20220426-143456
> base:   https://git.kernel.org/pub/scm/linux/kernel/git/wireless/wireless-next.git main
> config: i386-allmodconfig
> (https://download.01.org/0day-ci/archive/20220429/202204290830.slUaIhad-lkp@intel.com/config)
> compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project
> c59473aacce38cd7dd77eebceaf3c98c5707ab3b)
> reproduce (this is a W=1 build):
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O
> ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         # https://github.com/intel-lab-lkp/linux/commit/5aaabdd4d9ac433ed14c1c02147c2609827739d2
>         git remote add linux-review https://github.com/intel-lab-lkp/linux
>         git fetch --no-tags linux-review
> Ping-Ke-Shih/rtw89-8852c-add-RFK-and-then-enable-8852ce-in-Makefile-and-Kconfig/20220426-143456
>         git checkout 5aaabdd4d9ac433ed14c1c02147c2609827739d2
>         # save the config file
>         mkdir build_dir && cp config build_dir/.config
>         COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386
> SHELL=/bin/bash drivers/net/wireless/realtek/rtw89/
> 
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@intel.com>
> 
> All warnings (new ones prefixed by >>):
> 
> >> drivers/net/wireless/realtek/rtw89/rtw8852c.c:2640:2: warning: result of comparison of constant
> 18446744073709551615 with expression of type 'typeof (_Generic((__msk), char: (unsigned char)0, unsigned
> char: (unsigned char)0, signed char: (unsigned char)0, unsigned short: (unsigned short)0, short: (unsigned
> short)0, unsigned int: (unsigned int)0, int: (unsigned int)0, unsigned long: (unsigned long)0, long:
> (unsigned long)0, unsigned long long: (unsigned long long)0, long long: (unsigned long long)0, default:
> (__msk)))' (aka 'unsigned long') is always false [-Wtautological-constant-out-of-range-compare]
>            __write_ctrl(R_AX_PWR_RATE_CTRL, B_AX_FORCE_PWR_BY_RATE_VALUE_MASK,
>            ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    drivers/net/wireless/realtek/rtw89/rtw8852c.c:2621:13: note: expanded from macro '__write_ctrl'
>            u32 _wrt = FIELD_PREP(__msk, _val);                     \
>                       ^~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/bitfield.h:114:3: note: expanded from macro 'FIELD_PREP'
>                    __BF_FIELD_CHECK(_mask, 0ULL, _val, "FIELD_PREP: ");    \
>                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/bitfield.h:71:53: note: expanded from macro '__BF_FIELD_CHECK'
>                    BUILD_BUG_ON_MSG(__bf_cast_unsigned(_mask, _mask) >     \
>                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
>    note: (skipping 1 expansions in backtrace; use -fmacro-backtrace-limit=0 to see all)
>    include/linux/compiler_types.h:352:22: note: expanded from macro 'compiletime_assert'
>            _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__)
>            ~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/compiler_types.h:340:23: note: expanded from macro '_compiletime_assert'
>            __compiletime_assert(condition, msg, prefix, suffix)
>            ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>    include/linux/compiler_types.h:332:9: note: expanded from macro '__compiletime_assert'
>                    if (!(condition))                                       \
>                          ^~~~~~~~~

We add 'BUILD_BUG_ON((__msk & __en) != 0);' to prevent coding error during
development. The __msk and __en in the expression are constant and expected
no intersection of these two bit masks. Since we have verified this code,
I think I can send a patch to remove the BUILD_BUG_ON() from this macro.

Thank you
Ping-Ke