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 This calls is obsolete, the calls add and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>

diff --git a/arch/s390/kernel/perf_cpum_cf.c b/arch/s390/kernel/perf_cpum_cf.c
index 931e9d9..31a605b 100644 (file)
--- a/arch/s390/kernel/perf_cpum_cf.c
+++ b/arch/s390/kernel/perf_cpum_cf.c
@@ -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);
 }
 
 /*