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| author | Michael Ellerman <mpe@ellerman.id.au> | 2015-03-30 08:21:40 +0300 |
|---|---|---|
| committer | Shuah Khan <shuahkh@osg.samsung.com> | 2015-03-31 19:15:36 +0300 |
| commit | a05ffdce7155769ea5ac3409e1490fb9116dbaed (patch) | |
| tree | 01e6359c13e5dcd626b0117d11ab0a150c7274c7 /tools/testing/selftests/ftrace | |
| parent | 0b63accf87225b5eb7e52814c374cf02d733d4bb (diff) | |
| download | linux-a05ffdce7155769ea5ac3409e1490fb9116dbaed.tar.xz | |
ftracetest: Cope properly with stack tracer not being enabled
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 <mpe@ellerman.id.au>
Acked-by: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Diffstat (limited to 'tools/testing/selftests/ftrace')
| -rw-r--r-- | tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc | 4 |
1 files changed, 3 insertions, 1 deletions
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 |