If the stack tracer (CONFIG_STACK_TRACER) is disabled, the
fgraph-filter-stack test blows chunks:
[8] ftrace - function graph filters with stack tracer [FAIL]
+ reset_tracer
+ echo nop
./ftracetest: 19:
/home/michael/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc:
cannot create /proc/sys/kernel/stack_tracer_enabled: Directory
nonexistent
Fix it by checking if the proc file exists before echoing to it. With
the patch applied it fails correctly with:
[8] ftrace - function graph filters with stack tracer [UNSUPPORTED]
Signed-off-by: Michael Ellerman <[email protected]>
---
tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git
a/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
index c15e018e0220..3b1cf20cf6d8 100644
--- a/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
+++ b/tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
@@ -16,7 +16,9 @@ fi
do_reset() {
reset_tracer
- echo 0 > /proc/sys/kernel/stack_tracer_enabled
+ if [ -e /proc/sys/kernel/stack_tracer_enabled ]; then
+ echo 0 > /proc/sys/kernel/stack_tracer_enabled
+ fi
enable_tracing
clear_trace
echo > set_ftrace_filter
--
2.1.0
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