1:08 a.m.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/jfern/linux.git rcu/refperf
head: df3410c1f7436cf0a91127b2629a33923cc62140
commit: e9577008869a8d050252b346823d54ab84af4021 [1/3] test
config: i386-randconfig-r015-20200514 (attached as .config)
compiler: gcc-7 (Ubuntu 7.5.0-6ubuntu2) 7.5.0
reproduce:
git checkout e9577008869a8d050252b346823d54ab84af4021
# save the attached .config to linux build tree
make ARCH=i386
If you fix the issue, kindly add following tag as appropriate
Reported-by: kbuild test robot <lkp(a)intel.com>
All error/warnings (new ones prefixed by >>, old ones prefixed by <<):
kernel/rcu/tree.c: In function 'rcu_pr_kthread':
kernel/rcu/tree.c:3852:35: warning: unused variable 'spincnt2'
[-Wunused-variable]
unsigned long spincnt, spincnt1, spincnt2, x=0;
^~~~~~~~
kernel/rcu/tree.c:3852:25: warning: unused variable 'spincnt1'
[-Wunused-variable]
unsigned long spincnt, spincnt1, spincnt2, x=0;
^~~~~~~~
kernel/rcu/tree.c:3851:7: warning: unused variable 'work' [-Wunused-variable]
char work, *workp = this_cpu_ptr(&rcu_data.rcu_pr_has_work);
^~~~
kernel/rcu/tree.c:3850:16: warning: unused variable 'statusp' [-Wunused-variable]
unsigned int *statusp = this_cpu_ptr(&rcu_data.rcu_pr_kthread_status);
^~~~~~~
kernel/rcu/tree.c: In function 'rcu_spawn_pr_kthreads':
> kernel/rcu/tree.c:3979:8: error: passing argument 4 of
'proc_create' from incompatible pointer type [-Werror=incompatible-pointer-types]
&pr_ops);
^
In file included from kernel/rcu/tree.c:23:0:
include/linux/proc_fs.h:79:24: note: expected 'const struct proc_ops *' but
argument is of type 'const struct file_operations *'
struct proc_dir_entry *proc_create(const char *name, umode_t mode, struct proc_dir_entry
*parent, const struct proc_ops *proc_ops);
^~~~~~~~~~~
kernel/rcu/tree.c: In function 'pr_proc_write':
> kernel/rcu/tree.c:3957:1: warning: control reaches end of
non-void function [-Wreturn-type]
}
^
cc1: some warnings being treated as errors
vim +/proc_create +3979 kernel/rcu/tree.c
3935
3936 ssize_t pr_proc_write(struct file * f, const char __user * b, size_t s, loff_t *
off)
3937 {
3938 u64 before, after;
3939
3940 WRITE_ONCE(work_type, PERCPU_RWSEM);
3941 repeat:
3942 smp_mb();
3943
3944 before = ktime_get_mono_fast_ns();
3945 do_one_pr_test();
3946 after = ktime_get_mono_fast_ns();
3947
3948 pr_err("Total time: %lu us , type: %s\n", (unsigned long)((after -
before) / 1000),
3949 (work_type == PERCPU_RWSEM ? "percpu-rwsem" : "rwsem") );
3950
3951 if (work_type != RWSEM) {
3952 work_type = RWSEM;
3953 msleep(100);
3954 goto repeat;
3955 }
3956
3957 }
3958
3959 static const struct file_operations pr_ops = {
3960 .write = pr_proc_write,
3961 .llseek = default_llseek,
3962 };
3963
3964 /*
3965 * Spawn boost kthreads -- called as soon as the scheduler is running.
3966 */
3967 static void __init rcu_spawn_pr_kthreads(void)
3968 {
3969 int cpu;
3970
3971 for_each_possible_cpu(cpu)
3972 per_cpu(rcu_data.rcu_pr_has_work, cpu) = 0;
3973
3974 if (WARN_ONCE(smpboot_register_percpu_thread(&rcu_pr_thread_spec),
3975 "%s: Could not start rcub kthread, OOM is now expected behavior\n",
__func__))
3976 return;
3977
3978 proc_create("prw_test", 0777, NULL,
3979 &pr_ops);
3980
3981 /*
3982 for_each_online_cpu(cpu) {
3983 pr_err("waking up thread on online cpu %d\n", cpu);
3984 per_cpu(rcu_data.rcu_pr_has_work, cpu) = 1;
3985 smp_mb();
3986 wake_up_process(per_cpu(rcu_data.pr_kthread, cpu));
3987 }
3988 */
3989 }
3990
---
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