From: Robert Richter robert.richter@linaro.org
Reducing duplicate code by introducing function get_persistent_event() to get the descriptor of an persistent event.
Signed-off-by: Robert Richter robert.richter@linaro.org Signed-off-by: Robert Richter rric@kernel.org --- kernel/events/persistent.c | 36 ++++++++++++++++++++++-------------- 1 file changed, 22 insertions(+), 14 deletions(-)
diff --git a/kernel/events/persistent.c b/kernel/events/persistent.c index e6a7664..7d91871 100644 --- a/kernel/events/persistent.c +++ b/kernel/events/persistent.c @@ -16,6 +16,19 @@ struct pers_event_desc {
static DEFINE_PER_CPU(struct list_head, pers_events);
+static struct pers_event_desc +*get_persistent_event(int cpu, struct perf_event_attr *attr) +{ + struct pers_event_desc *desc; + + list_for_each_entry(desc, &per_cpu(pers_events, cpu), plist) { + if (desc->event->attr.config == attr->config) + return desc; + } + + return NULL; +} + static struct perf_event * add_persistent_event_on_cpu(unsigned int cpu, struct perf_event_attr *attr, unsigned nr_pages) @@ -58,18 +71,13 @@ out:
static void del_persistent_event(int cpu, struct perf_event_attr *attr) { - struct pers_event_desc *desc, *tmp; - struct perf_event *event = NULL; - - list_for_each_entry_safe(desc, tmp, &per_cpu(pers_events, cpu), plist) { - if (desc->event->attr.config == attr->config) { - event = desc->event; - break; - } - } + struct pers_event_desc *desc; + struct perf_event *event;
- if (!event) + desc = get_persistent_event(cpu, attr); + if (!desc) return; + event = desc->event;
list_del(&desc->plist);
@@ -161,11 +169,11 @@ int perf_get_persistent_event_fd(unsigned cpu, struct perf_event_attr *attr) if (cpu >= (unsigned)nr_cpu_ids) return -EINVAL;
- list_for_each_entry(desc, &per_cpu(pers_events, cpu), plist) - if (desc->event->attr.config == attr->config) - return __alloc_persistent_event_fd(desc); + desc = get_persistent_event(cpu, attr); + if (!desc) + return -ENODEV;
- return -ENODEV; + return __alloc_persistent_event_fd(desc); }