Re: [PATCH] perf/core: Fix sampling period inconsistency across CPU migration
From: kernel test robot
Date: Wed Apr 29 2026 - 03:38:44 EST
Hi Minwoo,
kernel test robot noticed the following build errors:
[auto build test ERROR on perf-tools-next/perf-tools-next]
[also build test ERROR on tip/perf/core perf-tools/perf-tools linus/master v7.1-rc1 next-20260428]
[cannot apply to acme/perf/core]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]
url: https://github.com/intel-lab-lkp/linux/commits/Minwoo-Ahn/perf-core-Fix-sampling-period-inconsistency-across-CPU-migration/20260429-115721
base: https://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools-next.git perf-tools-next
patch link: https://lore.kernel.org/r/20260428115317.22839-1-mwahn402%40gmail.com
patch subject: [PATCH] perf/core: Fix sampling period inconsistency across CPU migration
config: arc-allnoconfig (https://download.01.org/0day-ci/archive/20260429/202604291520.xGDlzjFN-lkp@xxxxxxxxx/config)
compiler: arc-linux-gcc (GCC) 15.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20260429/202604291520.xGDlzjFN-lkp@xxxxxxxxx/reproduce)
If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@xxxxxxxxx>
| Closes: https://lore.kernel.org/oe-kbuild-all/202604291520.xGDlzjFN-lkp@xxxxxxxxx/
All errors (new ones prefixed by >>):
In file included from include/linux/trace_events.h:10,
from include/trace/syscall.h:7,
from include/linux/syscalls.h:95,
from include/linux/syscalls_api.h:1,
from kernel/sched/sched.h:64,
from kernel/sched/rq-offsets.c:5:
>> include/linux/perf_event.h:1166:9: error: unknown type name 'local64_t'; did you mean 'local_t'?
1166 | local64_t period_left;
| ^~~~~~~~~
| local_t
make[3]: *** [scripts/Makefile.build:184: kernel/sched/rq-offsets.s] Error 1
make[3]: Target 'prepare' not remade because of errors.
make[2]: *** [Makefile:1337: prepare0] Error 2
make[2]: Target 'prepare' not remade because of errors.
make[1]: *** [Makefile:248: __sub-make] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:248: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.
vim +1166 include/linux/perf_event.h
1153
1154 #define perf_event_equal_task_ctx(a1, a2) \
1155 ((a1)->config == (a2)->config && \
1156 (a1)->sample_period == (a2)->sample_period)
1157
1158 /**
1159 * struct perf_task_context - per-task software event context
1160 *
1161 * Shared across per-CPU perf_event instances of the same task to
1162 * preserve period_left across CPU migrations.
1163 */
1164 struct perf_task_context {
1165 refcount_t refcount;
> 1166 local64_t period_left;
1167 };
1168
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