tracing: Fix hwlat kthread migration

The hwlat tracer creates a kernel thread at start of the tracer. It is
pinned to a single CPU and will move to the next CPU after each period of
running. If the user modifies the migration thread's affinity, it will not
change after that happens.

The original code created the thread at the first instance it was called,
but later was changed to destroy the thread after the tracer was finished,
and would not be created until the next instance of the tracer was
established. The code that initialized the affinity was only called on the
initial instantiation of the tracer. After that, it was not initialized, and
the previous affinity did not match the current newly created one, making
it appear that the user modified the thread's affinity when it did not, and
the thread failed to migrate again.

Cc: stable@vger.kernel.org
Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

path: root/net/phonet/Kconfig

#
# Phonet protocol
#

config PHONET
	tristate "Phonet protocols family"
	help
	  The Phone Network protocol (PhoNet) is a packet-oriented
	  communication protocol developed by Nokia for use with its modems.

	  This is required for Maemo to use cellular data connectivity (if
	  supported). It can also be used to control Nokia phones
	  from a Linux computer, although AT commands may be easier to use.

	  To compile this driver as a module, choose M here: the module
	  will be called phonet. If unsure, say N.