From: kernel test robot <lkp@intel.com>
To: "Paul E. McKenney" <paulmck@kernel.org>
Cc: clang-built-linux@googlegroups.com, kbuild-all@lists.01.org,
linux-kernel@vger.kernel.org,
Thomas Gleixner <tglx@linutronix.de>
Subject: kernel/time/clocksource-wdtest.c:47:22: warning: signed shift result (0x27BC86B00) requires 35 bits to represent, but 'long' only has 32 bits
Date: Sun, 4 Jul 2021 05:42:36 +0800 [thread overview]
Message-ID: <202107040532.wqL30yFp-lkp@intel.com> (raw)
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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
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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next reply other threads:[~2021-07-03 21:42 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-03 21:42 kernel test robot [this message]
2021-07-04 17:43 ` kernel/time/clocksource-wdtest.c:47:22: warning: signed shift result (0x27BC86B00) requires 35 bits to represent, but 'long' only has 32 bits Paul E. McKenney
2021-07-05 7:47 ` [kbuild-all] " Rong Chen
2021-07-05 15:21 ` Paul E. McKenney
2021-07-06 0:11 ` Rong Chen
2021-07-06 15:47 ` Paul E. McKenney
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