[patch] perf tools: perf list broken on ARM

[Vince Weaver]

Hello,

"perf list" listing of hardware events doesn't work on older ARM devices.
The change enabling event detection:

commit b41f1cec91c37eeea6fdb15effbfa24ea0a5536b
Author: Namhyung Kim <namhyung.kim@xxxxxxx>
Date:   Tue Aug 27 11:41:53 2013 +0900

    perf list: Skip unsupported events


uses the following code in tools/perf/util/parse-events.c:

       struct perf_event_attr attr = {
               .type = type,
               .config = config,
               .disabled = 1,
               .exclude_kernel = 1,
       };

On ARM machines pre-dating the Cortex-A15 this doesn't work, as
these machines don't support .exclude_kernel.  So starting with 3.12
"perf list" does not report any hardware events at all on older
machines (seen on Rasp-Pi, Pandaboard, Beagleboard, etc).

If we drop the "exclude_kernel" attribute events are properly reported.

Reported-by: Chad Paradis <chad.paradis@xxxxxxxxxxxxxx>
Signed-off-by: Vince Weaver <vincent.weaver@xxxxxxxxx>

diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 6de6f89..360ecab 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1087,7 +1087,6 @@ static bool is_event_supported(u8 type, unsigned config)
 		.type = type,
 		.config = config,
 		.disabled = 1,
-		.exclude_kernel = 1,
 	};
 	struct {
 		struct thread_map map;
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/