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Subject[paulmck-rcu:dev.2021.08.25a 77/115] kernel/cpu.c:158:6: error: conflicting types for 'cpu_hp_check_delay'; have 'bool(const char *, const void *)' {aka '_Bool(const char *, const void *)'}
Hi Paul,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git dev.2021.08.25a
head: 2ba1d046d9bc5b4496027d120e3ddcdfbb2fe9f4
commit: 545fb85f707c973cc4f1718572e33267c9c110a2 [77/115] EXP cpu: Make cpu_hp_check_delay() return true when detecting an anomaly
config: arc-randconfig-r001-20210915 (attached as .config)
compiler: arc-elf-gcc (GCC) 11.2.0
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git/commit/?id=545fb85f707c973cc4f1718572e33267c9c110a2
git remote add paulmck-rcu https://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu.git
git fetch --no-tags paulmck-rcu dev.2021.08.25a
git checkout 545fb85f707c973cc4f1718572e33267c9c110a2
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-11.2.0 make.cross ARCH=arc

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

All errors (new ones prefixed by >>):

kernel/cpu.c:137:6: error: redefinition of 'cpu_hp_start_now'
137 | void cpu_hp_start_now(void)
| ^~~~~~~~~~~~~~~~
In file included from kernel/cpu.c:17:
include/linux/cpu.h:147:20: note: previous definition of 'cpu_hp_start_now' with type 'void(void)'
147 | static inline void cpu_hp_start_now(void) { }
| ^~~~~~~~~~~~~~~~
kernel/cpu.c:146:6: error: redefinition of 'cpu_hp_stop_now'
146 | void cpu_hp_stop_now(void)
| ^~~~~~~~~~~~~~~
In file included from kernel/cpu.c:17:
include/linux/cpu.h:148:20: note: previous definition of 'cpu_hp_stop_now' with type 'void(void)'
148 | static inline void cpu_hp_stop_now(void) { }
| ^~~~~~~~~~~~~~~
>> kernel/cpu.c:158:6: error: conflicting types for 'cpu_hp_check_delay'; have 'bool(const char *, const void *)' {aka '_Bool(const char *, const void *)'}
158 | bool cpu_hp_check_delay(const char *s, const void *func)
| ^~~~~~~~~~~~~~~~~~
In file included from kernel/cpu.c:17:
include/linux/cpu.h:149:20: note: previous definition of 'cpu_hp_check_delay' with type 'bool(const char *, void *)' {aka '_Bool(const char *, void *)'}
149 | static inline bool cpu_hp_check_delay(const char *s, void *func) { return false; }
| ^~~~~~~~~~~~~~~~~~
In file included from arch/arc/include/asm/bug.h:30,
from include/linux/bug.h:5,
from include/linux/thread_info.h:13,
from include/asm-generic/preempt.h:5,
from ./arch/arc/include/generated/asm/preempt.h:1,
from include/linux/preempt.h:78,
from include/linux/rcupdate.h:27,
from include/linux/rculist.h:11,
from include/linux/pid.h:5,
from include/linux/sched.h:14,
from include/linux/sched/mm.h:7,
from kernel/cpu.c:6:
kernel/cpu.c: In function 'cpu_hp_check_delay':
kernel/cpu.c:170:48: warning: integer overflow in expression of type 'long int' results in '1215752192' [-Woverflow]
170 | if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) {
| ^
include/asm-generic/bug.h:173:32: note: in definition of macro 'WARN'
173 | int __ret_warn_on = !!(condition); \
| ^~~~~~~~~
kernel/cpu.c:170:13: note: in expansion of macro 'WARN_ONCE'
170 | if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) {
| ^~~~~~~~~
kernel/cpu.c:170:23: note: in expansion of macro 'time_after64'
170 | if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) {
| ^~~~~~~~~~~~


vim +158 kernel/cpu.c

156
157 /* Return true if a time-delay anomaly was detected. */
> 158 bool cpu_hp_check_delay(const char *s, const void *func)
159 {
160 bool ret = false;
161 u64 t, t1;
162
163 if (!smp_load_acquire(&cpu_hp_start_time_valid))
164 return false;
165 t = READ_ONCE(cpu_hp_start_time);
166 smp_mb();
167 if (!READ_ONCE(cpu_hp_start_time_valid))
168 return false;
169 t1 = ktime_get();
170 if (WARN_ONCE(time_after64(t1, t + 100 * NSEC_PER_SEC), "%s %ps took %llu milliseconds\n", s, func, (t1 - t) / NSEC_PER_MSEC)) {
171 WRITE_ONCE(cpu_hp_start_time, t1);
172 ret = true;
173 }
174 if (WARN_ONCE(time_before64(t1, t - 25 * NSEC_PER_MSEC), "%s %ps clock went backwards %llu milliseconds\n", s, func, (t - t1) / NSEC_PER_MSEC)){
175 WRITE_ONCE(cpu_hp_start_time, t1);
176 ret = true;
177 }
178 return ret;
179 }
180

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org
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