ftracetest: Take the first debugfs mount found
authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>
Fri, 31 Oct 2014 22:02:05 +0000 (18:02 -0400)
committerSteven Rostedt <rostedt@goodmis.org>
Mon, 3 Nov 2014 18:42:49 +0000 (13:42 -0500)
commite7dbb48958897c0a80b14250a981a563d9160e4d
treee679714789ebae73bc88f3c7a8a45e15521309d8
parent89c5497d1f933af56dac617f0fd86150942a7fb6
ftracetest: Take the first debugfs mount found

Running ftracetests on a box that mounted debugfs in two locations
made the ftracetests fail. This is because the tests uses a grep
of debugfs from the /proc/mounts file to find the debugfs mount
point, and then appends "/tracing" to that string to get the tracing
directory.

If the debugfs directory is mounted twice, then that grep will return
two answers and appending "/tracing" to a string with two lines will
not work.

Use "head -1" to only take the first mount point found.

Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
tools/testing/selftests/ftrace/ftracetest