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SubjectRe: [PATCH] sched: Enabled schedstat when schedstat tracepoints are enabled
Hi Steven,

[auto build test ERROR on tip/sched/core]
[also build test ERROR on v4.11-rc6 next-20170412]
[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/Steven-Rostedt/sched-Enabled-schedstat-when-schedstat-tracepoints-are-enabled/20170413-082900
config: i386-randconfig-x006-201715 (attached as .config)
compiler: gcc-6 (Debian 6.2.0-3) 6.2.0 20160901
reproduce:
# save the attached .config to linux build tree
make ARCH=i386

All errors (new ones prefixed by >>):

>> kernel/sched/core.c:2289:5: error: redefinition of 'schedstat_tracepoint_reg'
int schedstat_tracepoint_reg(void)
^~~~~~~~~~~~~~~~~~~~~~~~
In file included from kernel/sched/core.c:8:0:
include/linux/sched.h:1463:19: note: previous definition of 'schedstat_tracepoint_reg' was here
static inline int schedstat_tracepoint_reg(void) { return 0; }
^~~~~~~~~~~~~~~~~~~~~~~~
>> kernel/sched/core.c:2299:6: error: redefinition of 'schedstat_tracepoint_unreg'
void schedstat_tracepoint_unreg(void)
^~~~~~~~~~~~~~~~~~~~~~~~~~
In file included from kernel/sched/core.c:8:0:
include/linux/sched.h:1464:20: note: previous definition of 'schedstat_tracepoint_unreg' was here
static inline void schedstat_tracepoint_unreg(void) { }
^~~~~~~~~~~~~~~~~~~~~~~~~~
kernel/sched/core.c: In function 'schedstat_tracepoint_reg':
kernel/sched/core.c:2297:1: warning: control reaches end of non-void function [-Wreturn-type]
}
^

vim +/schedstat_tracepoint_reg +2289 kernel/sched/core.c

2283 * regfunc/unregfunc functions. They are protected by the tracepoint mutex.
2284 * See kernel/tracepoint.c:tracepoint_add_func().
2285 *
2286 * The modifications to schedstat_tracepoint_ref and schedstat_save_state
2287 * are only done under that mutex, and do not need further protection.
2288 */
> 2289 int schedstat_tracepoint_reg(void)
2290 {
2291 if (!schedstat_tracepoint_ref) {
2292 schedstat_save_state = schedstat_enabled();
2293 if (!schedstat_save_state)
2294 set_schedstats(true);
2295 }
2296 schedstat_tracepoint_ref++;
2297 }
2298
> 2299 void schedstat_tracepoint_unreg(void)
2300 {
2301 schedstat_tracepoint_ref--;
2302 if (schedstat_tracepoint_ref || schedstat_save_state)

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