perf parse-events: Add default_breakpoint_len helper

The default breakpoint length is "sizeof(long)" however this is
incorrect on platforms like Aarch64 where sizeof(long) is 8 but the
breakpoint length is 4. Add a helper function that can be used to
determine the correct breakpoint length, in this change it just
returns the existing default sizeof(long) value.

Use the helper in the bp_account test so that, when modifying the
event from a watchpoint to a breakpoint, the breakpoint length is
appropriate for the architecture and not just sizeof(long).

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Athira Rajeev <[email protected]>
Cc: Chaitanya S Prakash <[email protected]>
Cc: Colin Ian King <[email protected]>
Cc: Dominique Martinet <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Junhao He <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Masami Hiramatsu <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Yang Jihong <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

1 files changed, 2 insertions, 1 deletions

diff --git a/tools/perf/tests/bp_signal_overflow.c b/tools/perf/tests/bp_signal_overflow.c
index 4e897c2cf26b..ee560e156be6 100644
--- a/tools/perf/tests/bp_signal_overflow.c
+++ b/tools/perf/tests/bp_signal_overflow.c
@@ -25,6 +25,7 @@
 #include "tests.h"
 #include "debug.h"
 #include "event.h"
+#include "parse-events.h"
 #include "../perf-sys.h"
 #include "cloexec.h"
 
@@ -88,7 +89,7 @@ static int test__bp_signal_overflow(struct test_suite *test __maybe_unused, int
 	pe.config = 0;
 	pe.bp_type = HW_BREAKPOINT_X;
 	pe.bp_addr = (unsigned long) test_function;
-	pe.bp_len = sizeof(long);
+	pe.bp_len = default_breakpoint_len();
 
 	pe.sample_period = THRESHOLD;
 	pe.sample_type = PERF_SAMPLE_IP;