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ftracetest: Cope properly with stack tracer not being enabled

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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>
This commit is contained in:
Michael Ellerman 2015-03-30 16:21:40 +11:00 committed by Shuah Khan
parent 0b63accf87
commit a05ffdce71
1 changed files with 3 additions and 1 deletions
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4
tools/testing/selftests/ftrace/test.d/ftrace/fgraph-filter-stack.tc
View File

@ -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