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SubjectRe: [PATCH v5 2/2] tick/sched: Ensure quiet_vmstat() is called when the idle tick was stopped too
Hi Aaron,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[also build test ERROR on v5.19 next-20220802]
[cannot apply to tip/timers/nohz]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url: https://github.com/intel-lab-lkp/linux/commits/Aaron-Tomlin/tick-sched-Ensure-quiet_vmstat-is-called-when-the-idle-tick-was-stopped-too/20220802-074341
base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 9de1f9c8ca5100a02a2e271bdbde36202e251b4b
config: x86_64-randconfig-a016-20220801 (https://download.01.org/0day-ci/archive/20220803/202208031315.Wwa9w3jr-lkp@intel.com/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce (this is a W=1 build):
# https://github.com/intel-lab-lkp/linux/commit/a0d3b9fe31484c4c44c430d10d0b60e2e0551525
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Aaron-Tomlin/tick-sched-Ensure-quiet_vmstat-is-called-when-the-idle-tick-was-stopped-too/20220802-074341
git checkout a0d3b9fe31484c4c44c430d10d0b60e2e0551525
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

ld: vmlinux.o: in function `exit_to_user_mode_loop':
>> kernel/entry/common.c:182: undefined reference to `tick_nohz_user_enter_prepare'
ld: vmlinux.o: in function `exit_to_user_mode_prepare':
kernel/entry/common.c:198: undefined reference to `tick_nohz_user_enter_prepare'


vim +182 kernel/entry/common.c

a9f3a74a29af095 Thomas Gleixner 2020-07-22 144
a9f3a74a29af095 Thomas Gleixner 2020-07-22 145 static unsigned long exit_to_user_mode_loop(struct pt_regs *regs,
a9f3a74a29af095 Thomas Gleixner 2020-07-22 146 unsigned long ti_work)
a9f3a74a29af095 Thomas Gleixner 2020-07-22 147 {
a9f3a74a29af095 Thomas Gleixner 2020-07-22 148 /*
a9f3a74a29af095 Thomas Gleixner 2020-07-22 149 * Before returning to user space ensure that all pending work
a9f3a74a29af095 Thomas Gleixner 2020-07-22 150 * items have been completed.
a9f3a74a29af095 Thomas Gleixner 2020-07-22 151 */
a9f3a74a29af095 Thomas Gleixner 2020-07-22 152 while (ti_work & EXIT_TO_USER_MODE_WORK) {
a9f3a74a29af095 Thomas Gleixner 2020-07-22 153
a9f3a74a29af095 Thomas Gleixner 2020-07-22 154 local_irq_enable_exit_to_user(ti_work);
a9f3a74a29af095 Thomas Gleixner 2020-07-22 155
a9f3a74a29af095 Thomas Gleixner 2020-07-22 156 if (ti_work & _TIF_NEED_RESCHED)
a9f3a74a29af095 Thomas Gleixner 2020-07-22 157 schedule();
a9f3a74a29af095 Thomas Gleixner 2020-07-22 158
a9f3a74a29af095 Thomas Gleixner 2020-07-22 159 if (ti_work & _TIF_UPROBE)
a9f3a74a29af095 Thomas Gleixner 2020-07-22 160 uprobe_notify_resume(regs);
a9f3a74a29af095 Thomas Gleixner 2020-07-22 161
a9f3a74a29af095 Thomas Gleixner 2020-07-22 162 if (ti_work & _TIF_PATCH_PENDING)
a9f3a74a29af095 Thomas Gleixner 2020-07-22 163 klp_update_patch_state(current);
a9f3a74a29af095 Thomas Gleixner 2020-07-22 164
12db8b690010ccf Jens Axboe 2020-10-26 165 if (ti_work & (_TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL))
8ba62d37949e248 Eric W. Biederman 2022-02-09 166 arch_do_signal_or_restart(regs);
a9f3a74a29af095 Thomas Gleixner 2020-07-22 167
a68de80f61f6af3 Sean Christopherson 2021-09-01 168 if (ti_work & _TIF_NOTIFY_RESUME)
03248addadf1a5e Eric W. Biederman 2022-02-09 169 resume_user_mode_work(regs);
a9f3a74a29af095 Thomas Gleixner 2020-07-22 170
a9f3a74a29af095 Thomas Gleixner 2020-07-22 171 /* Architecture specific TIF work */
a9f3a74a29af095 Thomas Gleixner 2020-07-22 172 arch_exit_to_user_mode_work(regs, ti_work);
a9f3a74a29af095 Thomas Gleixner 2020-07-22 173
a9f3a74a29af095 Thomas Gleixner 2020-07-22 174 /*
a9f3a74a29af095 Thomas Gleixner 2020-07-22 175 * Disable interrupts and reevaluate the work flags as they
a9f3a74a29af095 Thomas Gleixner 2020-07-22 176 * might have changed while interrupts and preemption was
a9f3a74a29af095 Thomas Gleixner 2020-07-22 177 * enabled above.
a9f3a74a29af095 Thomas Gleixner 2020-07-22 178 */
a9f3a74a29af095 Thomas Gleixner 2020-07-22 179 local_irq_disable_exit_to_user();
47b8ff194c1fd73 Frederic Weisbecker 2021-02-01 180
47b8ff194c1fd73 Frederic Weisbecker 2021-02-01 181 /* Check if any of the above work has queued a deferred wakeup */
f268c3737ecaefc Frederic Weisbecker 2021-05-27 @182 tick_nohz_user_enter_prepare();
47b8ff194c1fd73 Frederic Weisbecker 2021-02-01 183
6ce895128b3bff7 Mark Rutland 2021-11-29 184 ti_work = read_thread_flags();
a9f3a74a29af095 Thomas Gleixner 2020-07-22 185 }
a9f3a74a29af095 Thomas Gleixner 2020-07-22 186
a9f3a74a29af095 Thomas Gleixner 2020-07-22 187 /* Return the latest work state for arch_exit_to_user_mode() */
a9f3a74a29af095 Thomas Gleixner 2020-07-22 188 return ti_work;
a9f3a74a29af095 Thomas Gleixner 2020-07-22 189 }
a9f3a74a29af095 Thomas Gleixner 2020-07-22 190

--
0-DAY CI Kernel Test Service
https://01.org/lkp

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