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SubjectRe: [tip: timers/core] itimers: Use quick sample function
Hi tip-bot2,

Thank you for the patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc6 next-20190829]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url: https://github.com/0day-ci/linux/commits/tip-bot2-for-Thomas-Gleixner/itimers-Use-quick-sample-function/20190830-063115
config: i386-defconfig (attached as .config)
compiler: gcc-7 (Debian 7.4.0-11) 7.4.0
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

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

All errors (new ones prefixed by >>):

kernel/time/itimer.c: In function 'get_cpu_itimer':
>> kernel/time/itimer.c:61:3: error: implicit declaration of function 'thread_group_sample_cputime'; did you mean 'thread_group_cputime'? [-Werror=implicit-function-declaration]
thread_group_sample_cputime(tsk, &cputime);
^~~~~~~~~~~~~~~~~~~~~~~~~~~
thread_group_cputime
cc1: some warnings being treated as errors

vim +61 kernel/time/itimer.c

46
47 static void get_cpu_itimer(struct task_struct *tsk, unsigned int clock_id,
48 struct itimerval *const value)
49 {
50 u64 val, interval;
51 struct cpu_itimer *it = &tsk->signal->it[clock_id];
52
53 spin_lock_irq(&tsk->sighand->siglock);
54
55 val = it->expires;
56 interval = it->incr;
57 if (val) {
58 struct task_cputime cputime;
59 u64 t;
60
> 61 thread_group_sample_cputime(tsk, &cputime);
62 if (clock_id == CPUCLOCK_PROF)
63 t = cputime.utime + cputime.stime;
64 else
65 /* CPUCLOCK_VIRT */
66 t = cputime.utime;
67
68 if (val < t)
69 /* about to fire */
70 val = TICK_NSEC;
71 else
72 val -= t;
73 }
74
75 spin_unlock_irq(&tsk->sighand->siglock);
76
77 value->it_value = ns_to_timeval(val);
78 value->it_interval = ns_to_timeval(interval);
79 }
80

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation
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