Re: [PATCH v2] selftests/user_events: Fix failures when user_events is not installed

[Google]

On Sat, 9 Sep 2023 00:33:05 +0100
Mark Brown <broonie@xxxxxxxxxx> wrote:

> On Fri, Sep 08, 2023 at 08:19:16PM +0000, Beau Belgrave wrote:
> 
> > Add common methods to detect if tracefs and user_events is enabled. If
> > either is not enabled skip the test. If tracefs is enabled, but is not
> > mounted, mount tracefs and fail if there were any errors. Fail if not
> > run as root.
> 
> This will leave tracefs mounted if it was not already mounted which is a
> change to the system configuration.  While that may happen if things go
> wrong during a test we should probably avoid actively doing this and
> either only skip or try to umount at the end of the test if we mounted
> ourselves.

Oh, I didn't know that. I need to update ftracetest to unmount tracefs if
it is not mounted.

Thanks!

-- 
Masami Hiramatsu (Google) <mhiramat@xxxxxxxxxx>