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s390/cpumf: remove call to perf_event_update_userpage 

The function cpumf_pmu_add and cpumf_pmu_del call function
perf_event_update_userpage(). This calls is obsolete, the calls add and
delete a counter event. Counter events do not sample data and the
event->rb member to access the sampling ring buffer is always NULL.
The function perf_event_update_userpage() simply returns in this case.

Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by : Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Thomas Richter 2021-04-26 14:57:16 +02:00 committed by Heiko Carstens
parent 1eefa4f439
commit b0583ab477
1 changed files with 0 additions and 4 deletions
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4
arch/s390/kernel/perf_cpum_cf.c
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@ -428,8 +428,6 @@ static int cpumf_pmu_add(struct perf_event *event, int flags)
if (flags & PERF_EF_START)
cpumf_pmu_start(event, PERF_EF_RELOAD);
perf_event_update_userpage(event);
return 0;
}
@ -449,8 +447,6 @@ static void cpumf_pmu_del(struct perf_event *event, int flags)
*/
if (!atomic_read(&cpuhw->ctr_set[event->hw.config_base]))
ctr_set_disable(&cpuhw->state, event->hw.config_base);
perf_event_update_userpage(event);
}
/*