Messages in this thread | | | Date | Sun, 4 Jul 2021 05:42:36 +0800 | From | kernel test robot <> | Subject | kernel/time/clocksource-wdtest.c:47:22: warning: signed shift result (0x27BC86B00) requires 35 bits to represent, but 'long' only has 32 bits |
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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 303392fd5c160822bf778270b28ec5ea50cab2b4 commit: 1253b9b87e42ab6a3d5c2cb27af2bdd67d7e50ff clocksource: Provide kernel module to test clocksource watchdog date: 11 days ago config: mips-randconfig-r015-20210702 (attached as .config) compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9eb613b2de3163686b1a4bd1160f15ac56a4b083) 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 # install mips cross compiling tool for clang build # apt-get install binutils-mips-linux-gnu # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=1253b9b87e42ab6a3d5c2cb27af2bdd67d7e50ff git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout 1253b9b87e42ab6a3d5c2cb27af2bdd67d7e50ff # save the attached .config to linux build tree COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=mips
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 >>):
>> kernel/time/clocksource-wdtest.c:47:22: warning: signed shift result (0x27BC86B00) requires 35 bits to represent, but 'long' only has 32 bits [-Wshift-overflow] .mult = TICK_NSEC << JIFFIES_SHIFT, /* details above */ ~~~~~~~~~ ^ ~~~~~~~~~~~~~ 1 warning generated.
vim +/long +47 kernel/time/clocksource-wdtest.c
39 40 static struct clocksource clocksource_wdtest_jiffies = { 41 .name = "wdtest-jiffies", 42 .rating = 1, /* lowest valid rating*/ 43 .uncertainty_margin = TICK_NSEC, 44 .read = wdtest_jiffies_read, 45 .mask = CLOCKSOURCE_MASK(32), 46 .flags = CLOCK_SOURCE_MUST_VERIFY, > 47 .mult = TICK_NSEC << JIFFIES_SHIFT, /* details above */ 48 .shift = JIFFIES_SHIFT, 49 .max_cycles = 10, 50 }; 51
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