Commit b0583ab4 authored Apr 26, 2021 by Thomas Richter Committed by Heiko Carstens Apr 30, 2021

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 This calls is obsolete, the calls add and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>

parent 1eefa4f4

arch/s390/kernel/perf_cpum_cf.c

+0 −4

Original line number	Diff line number	Diff line
		@@ -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);
		}

		/*