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/include/dt-bindings/power/r8a7793-sysc.h

/*
 * Copyright (C) 2016 Glider bvba
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 */
#ifndef __DT_BINDINGS_POWER_R8A7793_SYSC_H__
#define __DT_BINDINGS_POWER_R8A7793_SYSC_H__

/*
 * These power domain indices match the numbers of the interrupt bits
 * representing the power areas in the various Interrupt Registers
 * (e.g. SYSCISR, Interrupt Status Register)
 *
 * Note that R-Car M2-N is identical to R-Car M2-W w.r.t. power domains.
 */

#define R8A7793_PD_CA15_CPU0		 0
#define R8A7793_PD_CA15_CPU1		 1
#define R8A7793_PD_CA15_SCU		12
#define R8A7793_PD_SH_4A		16
#define R8A7793_PD_SGX			20

/* Always-on power area */
#define R8A7793_PD_ALWAYS_ON		32

#endif /* __DT_BINDINGS_POWER_R8A7793_SYSC_H__ */