[PATCH v2 9/9] perf cs-etm: Show a warning for an unknown magic number

[James Clark]

Currently perf reports "Cannot allocate memory" which isn't very helpful
for a potentially user facing issue. If we add a new magic number in
the future, perf will be able to report unrecognised magic numbers.

Signed-off-by: James Clark <james.clark@xxxxxxx>
---
 tools/perf/util/cs-etm.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 788ad5a099f6..5b276bdb96a6 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -2973,6 +2973,11 @@ int cs_etm__process_auxtrace_info(union perf_event *event,
 
 			/* ETE shares first part of metadata with ETMv4 */
 			trcidr_idx = CS_ETMV4_TRCTRACEIDR;
+		} else {
+			ui__error("CS ETM Trace: Unrecognised magic number %#"PRIx64". File could be from a newer version of perf.\n",
+				  ptr[i]);
+			err = -EINVAL;
+			goto err_free_metadata;
 		}
 
 		if (!metadata[j]) {
-- 
2.28.0