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Date: Tue, 1 Mar 2016 11:56:36 -0800
From: tip-bot for Thomas Gleixner <tipbot@...or.com>
To: linux-tip-commits@...r.kernel.org
Cc: arjan@...ux.intel.com, rostedt@...dmis.org,
linux-kernel@...r.kernel.org, bigeasy@...utronix.de, tj@...nel.org,
riel@...hat.com, paulmck@...ux.vnet.ibm.com, tglx@...utronix.de,
rusty@...tcorp.com.au, akpm@...ux-foundation.org,
rafael.j.wysocki@...el.com, peterz@...radead.org, pjt@...gle.com,
hpa@...or.com, torvalds@...ux-foundation.org, oleg@...hat.com,
mingo@...nel.org, srivatsa@....edu
Subject: [tip:smp/hotplug] cpu/hotplug: Split out the state walk into
functions
Commit-ID: 2e1a3483ce74d197876e58281925dd4e378a7f28
Gitweb: http://git.kernel.org/tip/2e1a3483ce74d197876e58281925dd4e378a7f28
Author: Thomas Gleixner <tglx@...utronix.de>
AuthorDate: Fri, 26 Feb 2016 18:43:37 +0000
Committer: Thomas Gleixner <tglx@...utronix.de>
CommitDate: Tue, 1 Mar 2016 20:36:56 +0100
cpu/hotplug: Split out the state walk into functions
We need that for running callbacks on the AP and the BP.
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Cc: linux-arch@...r.kernel.org
Cc: Rik van Riel <riel@...hat.com>
Cc: Rafael Wysocki <rafael.j.wysocki@...el.com>
Cc: "Srivatsa S. Bhat" <srivatsa@....edu>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Arjan van de Ven <arjan@...ux.intel.com>
Cc: Sebastian Siewior <bigeasy@...utronix.de>
Cc: Rusty Russell <rusty@...tcorp.com.au>
Cc: Steven Rostedt <rostedt@...dmis.org>
Cc: Oleg Nesterov <oleg@...hat.com>
Cc: Tejun Heo <tj@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Paul McKenney <paulmck@...ux.vnet.ibm.com>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Paul Turner <pjt@...gle.com>
Link: http://lkml.kernel.org/r/20160226182341.374946234@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
---
kernel/cpu.c | 111 ++++++++++++++++++++++++++++++++++++-----------------------
1 file changed, 68 insertions(+), 43 deletions(-)
diff --git a/kernel/cpu.c b/kernel/cpu.c
index 3ec86bc..9572ca0 100644
--- a/kernel/cpu.c
+++ b/kernel/cpu.c
@@ -329,10 +329,74 @@ static int bringup_cpu(unsigned int cpu)
return 0;
}
+/*
+ * Hotplug state machine related functions
+ */
+static void undo_cpu_down(unsigned int cpu, struct cpuhp_cpu_state *st,
+ struct cpuhp_step *steps)
+{
+ for (st->state++; st->state < st->target; st->state++) {
+ struct cpuhp_step *step = steps + st->state;
+
+ if (!step->skip_onerr)
+ cpuhp_invoke_callback(cpu, st->state, step->startup);
+ }
+}
+
+static int cpuhp_down_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
+ struct cpuhp_step *steps, enum cpuhp_state target)
+{
+ enum cpuhp_state prev_state = st->state;
+ int ret = 0;
+
+ for (; st->state > target; st->state--) {
+ struct cpuhp_step *step = steps + st->state;
+
+ ret = cpuhp_invoke_callback(cpu, st->state, step->teardown);
+ if (ret) {
+ st->target = prev_state;
+ undo_cpu_down(cpu, st, steps);
+ break;
+ }
+ }
+ return ret;
+}
+
+static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st,
+ struct cpuhp_step *steps)
+{
+ for (st->state--; st->state > st->target; st->state--) {
+ struct cpuhp_step *step = steps + st->state;
+
+ if (!step->skip_onerr)
+ cpuhp_invoke_callback(cpu, st->state, step->teardown);
+ }
+}
+
+static int cpuhp_up_callbacks(unsigned int cpu, struct cpuhp_cpu_state *st,
+ struct cpuhp_step *steps, enum cpuhp_state target)
+{
+ enum cpuhp_state prev_state = st->state;
+ int ret = 0;
+
+ while (st->state < target) {
+ struct cpuhp_step *step;
+
+ st->state++;
+ step = steps + st->state;
+ ret = cpuhp_invoke_callback(cpu, st->state, step->startup);
+ if (ret) {
+ st->target = prev_state;
+ undo_cpu_up(cpu, st, steps);
+ break;
+ }
+ }
+ return ret;
+}
+
#ifdef CONFIG_HOTPLUG_CPU
EXPORT_SYMBOL(register_cpu_notifier);
EXPORT_SYMBOL(__register_cpu_notifier);
-
void unregister_cpu_notifier(struct notifier_block *nb)
{
cpu_maps_update_begin();
@@ -537,15 +601,6 @@ static int notify_dead(unsigned int cpu)
#endif
#ifdef CONFIG_HOTPLUG_CPU
-static void undo_cpu_down(unsigned int cpu, struct cpuhp_cpu_state *st)
-{
- for (st->state++; st->state < st->target; st->state++) {
- struct cpuhp_step *step = cpuhp_bp_states + st->state;
-
- if (!step->skip_onerr)
- cpuhp_invoke_callback(cpu, st->state, step->startup);
- }
-}
/* Requires cpu_add_remove_lock to be held */
static int __ref _cpu_down(unsigned int cpu, int tasks_frozen,
@@ -567,16 +622,8 @@ static int __ref _cpu_down(unsigned int cpu, int tasks_frozen,
prev_state = st->state;
st->target = target;
- for (; st->state > st->target; st->state--) {
- struct cpuhp_step *step = cpuhp_bp_states + st->state;
+ ret = cpuhp_down_callbacks(cpu, st, cpuhp_bp_states, target);
- ret = cpuhp_invoke_callback(cpu, st->state, step->teardown);
- if (ret) {
- st->target = prev_state;
- undo_cpu_down(cpu, st);
- break;
- }
- }
hasdied = prev_state != st->state && st->state == CPUHP_OFFLINE;
cpu_hotplug_done();
@@ -645,22 +692,12 @@ static int cpuhp_set_cpu_active(unsigned int cpu)
return 0;
}
-static void undo_cpu_up(unsigned int cpu, struct cpuhp_cpu_state *st)
-{
- for (st->state--; st->state > st->target; st->state--) {
- struct cpuhp_step *step = cpuhp_bp_states + st->state;
-
- if (!step->skip_onerr)
- cpuhp_invoke_callback(cpu, st->state, step->teardown);
- }
-}
-
/* Requires cpu_add_remove_lock to be held */
static int _cpu_up(unsigned int cpu, int tasks_frozen, enum cpuhp_state target)
{
struct cpuhp_cpu_state *st = per_cpu_ptr(&cpuhp_state, cpu);
struct task_struct *idle;
- int prev_state, ret = 0;
+ int ret = 0;
cpu_hotplug_begin();
@@ -687,20 +724,8 @@ static int _cpu_up(unsigned int cpu, int tasks_frozen, enum cpuhp_state target)
cpuhp_tasks_frozen = tasks_frozen;
- prev_state = st->state;
st->target = target;
- while (st->state < st->target) {
- struct cpuhp_step *step;
-
- st->state++;
- step = cpuhp_bp_states + st->state;
- ret = cpuhp_invoke_callback(cpu, st->state, step->startup);
- if (ret) {
- st->target = prev_state;
- undo_cpu_up(cpu, st);
- break;
- }
- }
+ ret = cpuhp_up_callbacks(cpu, st, cpuhp_bp_states, target);
out:
cpu_hotplug_done();
return ret;
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