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authorMichael Ellerman <mpe@ellerman.id.au>2015-03-30 07:21:40 +0200
committerShuah Khan <shuahkh@osg.samsung.com>2015-03-31 18:15:36 +0200
commita05ffdce7155769ea5ac3409e1490fb9116dbaed (patch)
tree01e6359c13e5dcd626b0117d11ab0a150c7274c7 /tools/testing
parenttools, update rtctest.c to verify passage of time (diff)
downloadlinux-a05ffdce7155769ea5ac3409e1490fb9116dbaed.tar.xz
linux-a05ffdce7155769ea5ac3409e1490fb9116dbaed.zip
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')
-rw-r--r--tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc4
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