perf pmus: Create placholder regardless of scanning core_only

If scanning all PMUs the placeholder is still necessary if no core PMU
is found. This situation occurs in perf test's parse-events test,
when uncore events appear before core.

Fixes: 628eaa4e877af823 ("perf pmus: Add placeholder core PMU")
Signed-off-by: Ian Rogers <[email protected]>
Tested-by: Thomas Richter <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Ian Rogers <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Rob Herring <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 7 insertions, 9 deletions

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 3cd9de42139e..c58ba9fb6a36 100644
--- a/tools/perf/util/pmus.c
+++ b/tools/perf/util/pmus.c
@@ -152,16 +152,14 @@ static void pmu_read_sysfs(bool core_only)
 	}
 
 	closedir(dir);
-	if (core_only) {
-		if (!list_empty(&core_pmus))
-			read_sysfs_core_pmus = true;
-		else {
-			if (perf_pmu__create_placeholder_core_pmu(&core_pmus))
-				read_sysfs_core_pmus = true;
-		}
-	} else {
+	if (list_empty(&core_pmus)) {
+		if (!perf_pmu__create_placeholder_core_pmu(&core_pmus))
+			pr_err("Failure to set up any core PMUs\n");
+	}
+	if (!list_empty(&core_pmus)) {
 		read_sysfs_core_pmus = true;
-		read_sysfs_all_pmus = true;
+		if (!core_only)
+			read_sysfs_all_pmus = true;
 	}
 }