linux-kernel - arch/mips/include/asm/mach-loongson2ef/cs5536/cs5536_mfgpt.h:29:18: warning: unsigned conversion from 'int' to 'u16' {aka 'short unsigned int'} changes value from '596583' to '6759'

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Message-ID: <202104211644.cmjfwH6P-lkp@intel.com>
Date:   Wed, 21 Apr 2021 16:06:52 +0800
From:   kernel test robot <lkp@...el.com>
To:     Jiaxun Yang <jiaxun.yang@...goat.com>
Cc:     kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>
Subject: arch/mips/include/asm/mach-loongson2ef/cs5536/cs5536_mfgpt.h:29:18:
 warning: unsigned conversion from 'int' to 'u16' {aka 'short unsigned int'}
 changes value from '596583' to '6759'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head:   1fe5501ba1abf2b7e78295df73675423bd6899a0
commit: b13812ddea615b6507beef24f76540c0c1143c5c MIPS: Loongson2ef: Disable Loongson MMI instructions
date:   7 months ago
config: mips-randconfig-r016-20210421 (attached as .config)
compiler: mips64el-linux-gcc (GCC) 9.3.0
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://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b13812ddea615b6507beef24f76540c0c1143c5c
        git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
        git fetch --no-tags linus master
        git checkout b13812ddea615b6507beef24f76540c0c1143c5c
        # save the attached .config to linux build tree
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross W=1 ARCH=mips 

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@...el.com>

All warnings (new ones prefixed by >>):

   In file included from arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c:24:
   arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c: In function 'mfgpt_timer_set_periodic':
>> arch/mips/include/asm/mach-loongson2ef/cs5536/cs5536_mfgpt.h:29:18: warning: unsigned conversion from 'int' to 'u16' {aka 'short unsigned int'} changes value from '596583' to '6759' [-Woverflow]
      29 | #define COMPARE  ((MFGPT_TICK_RATE + HZ/2) / HZ)
         |                  ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
   arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c:54:7: note: in expansion of macro 'COMPARE'
      54 |  outw(COMPARE, MFGPT0_CMP2); /* set comparator2 */
         |       ^~~~~~~
   arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c: At top level:
>> arch/mips/loongson2ef/common/cs5536/cs5536_mfgpt.c:195:12: warning: no previous prototype for 'init_mfgpt_clocksource' [-Wmissing-prototypes]
     195 | int __init init_mfgpt_clocksource(void)
         |            ^~~~~~~~~~~~~~~~~~~~~~


vim +29 arch/mips/include/asm/mach-loongson2ef/cs5536/cs5536_mfgpt.h

71e2f4dd5a65bd Jiaxun Yang 2019-10-20  27  
71e2f4dd5a65bd Jiaxun Yang 2019-10-20  28  #define MFGPT_TICK_RATE 14318000
71e2f4dd5a65bd Jiaxun Yang 2019-10-20 @29  #define COMPARE	 ((MFGPT_TICK_RATE + HZ/2) / HZ)
71e2f4dd5a65bd Jiaxun Yang 2019-10-20  30  

:::::: The code at line 29 was first introduced by commit
:::::: 71e2f4dd5a65bd8dbca0b77661e75eea471168f8 MIPS: Fork loongson2ef from loongson64

:::::: TO: Jiaxun Yang <jiaxun.yang@...goat.com>
:::::: CC: Paul Burton <paulburton@...nel.org>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org

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