This patch creates a config that can be used to disable the automount of
tracefs in the debugfs filesystem. Since the automount happens everytime
the path /sys/kernel/debug/tracing is accessed, unmounting from
userspace is ineffective against it.
The config is intended to prevent new tracefs clients from depending on
the automounted tracefs instance mounted at /sys/kernel/debug/tracing
instead of the one at /sys/kernel/tracing. Since Android R launching
devices and newer cannot mount debugfs in production builds, the
config is intended to minimize the difference between user and
userdebug builds w.r.t to tracefs and prevent regresssions.
Bug: 184381659
Signed-off-by: Hridya Valsaraju <hridya@google.com>
Change-Id: Ifda6df88081c8ecf23fcaf97790abc97525bca54
412bd71850