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Date: Tue, 30 Nov 2021 06:39:51 -0800
From: "Paul E. McKenney" <paulmck@...nel.org>
To: kernel test robot <lkp@...el.com>
Cc: llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
linux-kernel@...r.kernel.org
Subject: Re: [frederic-dynticks:rcu/dev 120/125]
kernel/time/clocksource-wdtest.c:149:12: error: use of undeclared identifier
'max_cswd_coarse_reads'
On Tue, Nov 30, 2021 at 04:04:36PM +0800, kernel test robot wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git rcu/dev
> head: 0a3f160b60a833f2ac5e68a0b3105005c69f185f
> commit: 21285cc89332025a23fca4c50a9d132d1b4109b5 [120/125] squash! clocksource: Forgive repeated long-latency watchdog clocksource reads
> config: x86_64-buildonly-randconfig-r001-20211128 (https://download.01.org/0day-ci/archive/20211130/202111301537.pHj67CAh-lkp@intel.com/config)
> compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project 25eb7fa01d7ebbe67648ea03841cda55b4239ab2)
> 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/frederic/linux-dynticks.git/commit/?id=21285cc89332025a23fca4c50a9d132d1b4109b5
> git remote add frederic-dynticks https://git.kernel.org/pub/scm/linux/kernel/git/frederic/linux-dynticks.git
> git fetch --no-tags frederic-dynticks rcu/dev
> git checkout 21285cc89332025a23fca4c50a9d132d1b4109b5
> # save the config file to linux build tree
> mkdir build_dir
> COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash kernel/time/
>
> If you fix the issue, kindly add following tag as appropriate
> Reported-by: kernel test robot <lkp@...el.com>
>
> All errors (new ones prefixed by >>):
>
> >> kernel/time/clocksource-wdtest.c:149:12: error: use of undeclared identifier 'max_cswd_coarse_reads'
> if (i != max_cswd_coarse_reads)
> ^
> 1 error generated.
This is due to me incompletely reverting patches from Waiman. It will
be fixed on the next rebase.
Thanx, Paul
> vim +/max_cswd_coarse_reads +149 kernel/time/clocksource-wdtest.c
>
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 102
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 103 /* Run the specified series of watchdog tests. */
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 104 static int wdtest_func(void *arg)
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 105 {
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 106 unsigned long j1, j2;
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 107 char *s1, *s2;
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 108 int i;
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 109
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 110 schedule_timeout_uninterruptible(holdoff * HZ);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 111
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 112 /*
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 113 * Verify that jiffies-like clocksources get the manually
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 114 * specified uncertainty margin.
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 115 */
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 116 pr_info("--- Verify jiffies-like uncertainty margin.\n");
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 117 __clocksource_register(&clocksource_wdtest_jiffies);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 118 WARN_ON_ONCE(clocksource_wdtest_jiffies.uncertainty_margin != TICK_NSEC);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 119
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 120 j1 = clocksource_wdtest_jiffies.read(&clocksource_wdtest_jiffies);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 121 schedule_timeout_uninterruptible(HZ);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 122 j2 = clocksource_wdtest_jiffies.read(&clocksource_wdtest_jiffies);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 123 WARN_ON_ONCE(j1 == j2);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 124
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 125 clocksource_unregister(&clocksource_wdtest_jiffies);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 126
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 127 /*
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 128 * Verify that tsc-like clocksources are assigned a reasonable
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 129 * uncertainty margin.
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 130 */
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 131 pr_info("--- Verify tsc-like uncertainty margin.\n");
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 132 clocksource_register_khz(&clocksource_wdtest_ktime, 1000 * 1000);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 133 WARN_ON_ONCE(clocksource_wdtest_ktime.uncertainty_margin < NSEC_PER_USEC);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 134
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 135 j1 = clocksource_wdtest_ktime.read(&clocksource_wdtest_ktime);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 136 udelay(1);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 137 j2 = clocksource_wdtest_ktime.read(&clocksource_wdtest_ktime);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 138 pr_info("--- tsc-like times: %lu - %lu = %lu.\n", j2, j1, j2 - j1);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 139 WARN_ON_ONCE(time_before(j2, j1 + NSEC_PER_USEC));
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 140
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 141 /* Verify tsc-like stability with various numbers of errors injected. */
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 142 for (i = 0; i <= max_cswd_read_retries + 1; i++) {
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 143 if (i <= 1 && i < max_cswd_read_retries)
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 144 s1 = "";
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 145 else if (i <= max_cswd_read_retries)
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 146 s1 = ", expect message";
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 147 else
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 148 s1 = ", expect coarse-grained clock skew check and re-initialization";
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 @149 if (i != max_cswd_coarse_reads)
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 150 s2 = "";
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 151 else if (!s1[0])
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 152 s2 = ", expect splat";
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 153 else
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 154 s2 = " along with a splat";
> 92b8b82aa04917 Paul E. McKenney 2021-10-22 155 pr_info("--- Watchdog with %dx error injection, %lu retries%s%s.\n", i, max_cswd_read_retries, s1, s2);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 156 WRITE_ONCE(wdtest_ktime_read_ndelays, i);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 157 schedule_timeout_uninterruptible(2 * HZ);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 158 WARN_ON_ONCE(READ_ONCE(wdtest_ktime_read_ndelays));
> 83272afd00b829 Paul E. McKenney 2021-05-27 159 WARN_ON_ONCE(clocksource_wdtest_ktime.flags & CLOCK_SOURCE_UNSTABLE);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 160 wdtest_ktime_clocksource_reset();
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 161 }
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 162
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 163 /* Verify tsc-like stability with clock-value-fuzz error injection. */
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 164 pr_info("--- Watchdog clock-value-fuzz error injection, expect clock skew and per-CPU mismatches.\n");
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 165 WRITE_ONCE(wdtest_ktime_read_fuzz, true);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 166 schedule_timeout_uninterruptible(2 * HZ);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 167 WARN_ON_ONCE(!(clocksource_wdtest_ktime.flags & CLOCK_SOURCE_UNSTABLE));
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 168 clocksource_verify_percpu(&clocksource_wdtest_ktime);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 169 WRITE_ONCE(wdtest_ktime_read_fuzz, false);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 170
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 171 clocksource_unregister(&clocksource_wdtest_ktime);
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 172
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 173 pr_info("--- Done with test.\n");
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 174 return 0;
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 175 }
> 1253b9b87e42ab Paul E. McKenney 2021-05-27 176
>
> :::::: The code at line 149 was first introduced by commit
> :::::: 92b8b82aa04917537136ad3f8e23f908573c4b73 torture: Test splatting for delay-ridden clocksources
>
> :::::: TO: Paul E. McKenney <paulmck@...nel.org>
> :::::: CC: Paul E. McKenney <paulmck@...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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