[PATCH] powerpc/perf/hv-24x7: Dont create sysfs event files for dummy events

[Kajol Jain <kjain@linux.ibm.com>]

hv_24x7 performance monitoring unit creates list of supported events
from the event catalog obtained via HCALL. hv_24x7 catalog could also
contain invalid or dummy events (with names like FREE_  or CPM_FREE_ so
on). These events does not have any hardware counters backing them.
So patch adds a check to string compare the event names to filter
out them.

Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
---
 arch/powerpc/perf/hv-24x7.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/arch/powerpc/perf/hv-24x7.c b/arch/powerpc/perf/hv-24x7.c
index 6e7e820508df..c3252d8a7818 100644
--- a/arch/powerpc/perf/hv-24x7.c
+++ b/arch/powerpc/perf/hv-24x7.c
@@ -894,6 +894,11 @@ static int create_events_from_catalog(struct attribute ***events_,
 
 		name = event_name(event, &nl);
 
+		if (strstr(name, "FREE_")) {
+			pr_info("invalid event %zu (%.*s)\n", event_idx, nl, name);
+			junk_events++;
+			continue;
+		}
 		if (event->event_group_record_len == 0) {
 			pr_devel("invalid event %zu (%.*s): group_record_len == 0, skipping\n",
 					event_idx, nl, name);
@@ -955,6 +960,9 @@ static int create_events_from_catalog(struct attribute ***events_,
 			continue;
 
 		name  = event_name(event, &nl);
+		if (strstr(name, "FREE_"))
+			continue;
+
 		nonce = event_uniq_add(&ev_uniq, name, nl, event->domain);
 		ct    = event_data_to_attrs(event_idx, events + event_attr_ct,
 					    event, nonce);
-- 
2.26.2