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'

From: kernel test robot
Date: Wed Apr 21 2021 - 04:07:47 EST


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@xxxxxxxxx>

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@xxxxxxxxxxx>
:::::: CC: Paul Burton <paulburton@xxxxxxxxxx>

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

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