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SubjectRe: [tip: timers/core] posix-cpu-timers: Use common permission check in posix_cpu_clock_get()
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-20190828]
[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/posix-cpu-timers-Use-common-permission-check-in-posix_cpu_clock_get/20190829-181227
config: parisc-c3000_defconfig (attached as .config)
compiler: hppa-linux-gcc (GCC) 7.4.0
reproduce:
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# save the attached .config to linux build tree
GCC_VERSION=7.4.0 make.cross ARCH=parisc

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

All error/warnings (new ones prefixed by >>):

kernel/time/posix-cpu-timers.c: In function 'posix_cpu_clock_get':
>> kernel/time/posix-cpu-timers.c:275:8: error: implicit declaration of function 'get_task_for_clock'; did you mean 'get_task_struct'? [-Werror=implicit-function-declaration]
tsk = get_task_for_clock(clock);
^~~~~~~~~~~~~~~~~~
get_task_struct
>> kernel/time/posix-cpu-timers.c:275:6: warning: assignment makes pointer from integer without a cast [-Wint-conversion]
tsk = get_task_for_clock(clock);
^
cc1: some warnings being treated as errors

vim +275 kernel/time/posix-cpu-timers.c

268
269 static int posix_cpu_clock_get(const clockid_t clock, struct timespec64 *tp)
270 {
271 const clockid_t clkid = CPUCLOCK_WHICH(clock);
272 struct task_struct *tsk;
273 u64 t;
274
> 275 tsk = get_task_for_clock(clock);
276 if (!tsk)
277 return -EINVAL;
278
279 if (CPUCLOCK_PERTHREAD(clock))
280 cpu_clock_sample(clkid, tsk, &t);
281 else
282 cpu_clock_sample_group(clkid, tsk, &t);
283 put_task_struct(tsk);
284
285 *tp = ns_to_timespec64(t);
286 return 0;
287 }
288

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