| Message ID | 1453369139-10203-2-git-send-email-shilpa.bhat@linux.vnet.ibm.com (mailing list archive) |
|---|---|
| State | Not Applicable |
| Headers | show |
Hi Shilpasri,
[auto build test ERROR on pm/linux-next]
[also build test ERROR on v4.4 next-20160121]
[if your patch is applied to the wrong git tree, please drop us a note to help improving the system]
url: https://github.com/0day-ci/linux/commits/Shilpasri-G-Bhat/cpufreq-powernv-Redesign-the-presentation-of-throttle-notification-and-solve-bug-fixes-in-the-driver/20160121-174402
base: https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git linux-next
config: powerpc-allyesconfig (attached as .config)
reproduce:
wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
make.cross ARCH=powerpc
Note: the linux-review/Shilpasri-G-Bhat/cpufreq-powernv-Redesign-the-presentation-of-throttle-notification-and-solve-bug-fixes-in-the-driver/20160121-174402 HEAD 9aca97b0876d0d182772832e0447a9bf58a967f7 builds fine.
It only hurts bisectibility.
All errors (new ones prefixed by >>):
drivers/cpufreq/powernv-cpufreq.c: In function 'powernv_cpufreq_work_fn':
>> drivers/cpufreq/powernv-cpufreq.c:428:2: error: implicit declaration of function 'get_online_cpus' [-Werror=implicit-function-declaration]
get_online_cpus();
^
>> drivers/cpufreq/powernv-cpufreq.c:449:2: error: implicit declaration of function 'put_online_cpus' [-Werror=implicit-function-declaration]
put_online_cpus();
^
cc1: some warnings being treated as errors
vim +/get_online_cpus +428 drivers/cpufreq/powernv-cpufreq.c
422 void powernv_cpufreq_work_fn(struct work_struct *work)
423 {
424 struct chip *chip = container_of(work, struct chip, throttle);
425 unsigned int cpu;
426 cpumask_t mask;
427
> 428 get_online_cpus();
429 cpumask_and(&mask, &chip->mask, cpu_online_mask);
430 smp_call_function_any(&mask,
431 powernv_cpufreq_throttle_check, NULL, 0);
432
433 if (!chip->restore)
434 goto out;
435
436 chip->restore = false;
437 for_each_cpu(cpu, &mask) {
438 int index;
439 struct cpufreq_policy policy;
440
441 cpufreq_get_policy(&policy, cpu);
442 cpufreq_frequency_table_target(&policy, policy.freq_table,
443 policy.cur,
444 CPUFREQ_RELATION_C, &index);
445 powernv_cpufreq_target_index(&policy, index);
446 cpumask_andnot(&mask, &mask, policy.cpus);
447 }
448 out:
> 449 put_online_cpus();
450 }
451
452 static char throttle_reason[][30] = {
---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
diff --git a/drivers/cpufreq/powernv-cpufreq.c b/drivers/cpufreq/powernv-cpufreq.c index 547890f..50a5b21 100644 --- a/drivers/cpufreq/powernv-cpufreq.c +++ b/drivers/cpufreq/powernv-cpufreq.c @@ -423,18 +423,19 @@ void powernv_cpufreq_work_fn(struct work_struct *work) { struct chip *chip = container_of(work, struct chip, throttle); unsigned int cpu; - cpumask_var_t mask; + cpumask_t mask; - smp_call_function_any(&chip->mask, + get_online_cpus(); + cpumask_and(&mask, &chip->mask, cpu_online_mask); + smp_call_function_any(&mask, powernv_cpufreq_throttle_check, NULL, 0); if (!chip->restore) - return; + goto out; chip->restore = false; - cpumask_copy(mask, &chip->mask); - for_each_cpu_and(cpu, mask, cpu_online_mask) { - int index, tcpu; + for_each_cpu(cpu, &mask) { + int index; struct cpufreq_policy policy; cpufreq_get_policy(&policy, cpu); @@ -442,9 +443,10 @@ void powernv_cpufreq_work_fn(struct work_struct *work) policy.cur, CPUFREQ_RELATION_C, &index); powernv_cpufreq_target_index(&policy, index); - for_each_cpu(tcpu, policy.cpus) - cpumask_clear_cpu(tcpu, mask); + cpumask_andnot(&mask, &mask, policy.cpus); } +out: + put_online_cpus(); } static char throttle_reason[][30] = {
In the kworker_thread powernv_cpufreq_work_fn(), we can end up sending an IPI to a cpu going offline. This is a rare corner case which is fixed using {get/put}_online_cpus(). Along with this fix, this patch adds changes to do oneshot cpumask_{clear/and} operation. Suggested-by: Shreyas B Prabhu <shreyas@linux.vnet.ibm.com> Suggested-by: Gautham R Shenoy <ego@linux.vnet.ibm.com> Signed-off-by: Shilpasri G Bhat <shilpa.bhat@linux.vnet.ibm.com> Reviewed-by: Gautham R. Shenoy <ego@linux.vnet.ibm.com> --- drivers/cpufreq/powernv-cpufreq.c | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-)