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Subject[PATCH UPDATED 20/17] freezer: remove unused @sig_only from freeze_task()
After "freezer: make freezing() test freeze conditions in effect
instead of TIF_FREEZE", freezing() returns authoritative answer on
whether the current task should freeze or not and freeze_task()
doesn't need or use @sig_only. Remove it.

While at it, rewrite function comment for freeze_task() and rename
@sig_only to @user_only in try_to_freeze_tasks().

This patch doesn't cause any functional change.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Oleg Nesterov <oleg@redhat.com>
---
include/linux/freezer.h | 2 +-
kernel/cgroup_freezer.c | 4 ++--
kernel/freezer.c | 21 +++++++++------------
kernel/power/process.c | 8 ++++----
4 files changed, 16 insertions(+), 19 deletions(-)

diff --git a/include/linux/freezer.h b/include/linux/freezer.h
index ac0513e..4b3dc4c 100644
--- a/include/linux/freezer.h
+++ b/include/linux/freezer.h
@@ -48,7 +48,7 @@ static inline bool try_to_freeze(void)
return __refrigerator(false);
}

-extern bool freeze_task(struct task_struct *p, bool sig_only);
+extern bool freeze_task(struct task_struct *p);
extern bool __set_freezable(bool with_signal);

#ifdef CONFIG_CGROUP_FREEZER
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 5f45423..d161958 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -206,7 +206,7 @@ static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task)

/* Locking avoids race with FREEZING -> THAWED transitions. */
if (freezer->state == CGROUP_FREEZING)
- freeze_task(task, true);
+ freeze_task(task);
spin_unlock_irq(&freezer->lock);
}

@@ -274,7 +274,7 @@ static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer)

cgroup_iter_start(cgroup, &it);
while ((task = cgroup_iter_next(cgroup, &it))) {
- if (!freeze_task(task, true))
+ if (!freeze_task(task))
continue;
if (frozen(task))
continue;
diff --git a/kernel/freezer.c b/kernel/freezer.c
index a9c18c7..0845321 100644
--- a/kernel/freezer.c
+++ b/kernel/freezer.c
@@ -100,20 +100,17 @@ static void fake_signal_wake_up(struct task_struct *p)
}

/**
- * freeze_task - send a freeze request to given task
- * @p: task to send the request to
- * @sig_only: if set, the request will only be sent if the task has the
- * PF_FREEZER_NOSIG flag unset
- * Return value: 'false', if @sig_only is set and the task has
- * PF_FREEZER_NOSIG set or the task is frozen, 'true', otherwise
+ * freeze_task - send a freeze request to given task
+ * @p: task to send the request to
*
- * The freeze request is sent by setting the tasks's TIF_FREEZE flag and
- * either sending a fake signal to it or waking it up, depending on whether
- * or not it has PF_FREEZER_NOSIG set. If @sig_only is set and the task
- * has PF_FREEZER_NOSIG set (ie. it is a typical kernel thread), its
- * TIF_FREEZE flag will not be set.
+ * If @p is freezing, the freeze request is sent by setting %TIF_FREEZE
+ * flag and either sending a fake signal to it or waking it up, depending
+ * on whether it has %PF_FREEZER_NOSIG set.
+ *
+ * RETURNS:
+ * %false, if @p is not freezing or already frozen; %true, otherwise
*/
-bool freeze_task(struct task_struct *p, bool sig_only)
+bool freeze_task(struct task_struct *p)
{
unsigned long flags;

diff --git a/kernel/power/process.c b/kernel/power/process.c
index eed8995..8bddc48 100644
--- a/kernel/power/process.c
+++ b/kernel/power/process.c
@@ -22,7 +22,7 @@
*/
#define TIMEOUT (20 * HZ)

-static int try_to_freeze_tasks(bool sig_only)
+static int try_to_freeze_tasks(bool user_only)
{
struct task_struct *g, *p;
unsigned long end_time;
@@ -37,14 +37,14 @@ static int try_to_freeze_tasks(bool sig_only)

end_time = jiffies + TIMEOUT;

- if (!sig_only)
+ if (!user_only)
freeze_workqueues_begin();

while (true) {
todo = 0;
read_lock(&tasklist_lock);
do_each_thread(g, p) {
- if (p == current || !freeze_task(p, sig_only))
+ if (p == current || !freeze_task(p))
continue;

/*
@@ -65,7 +65,7 @@ static int try_to_freeze_tasks(bool sig_only)
} while_each_thread(g, p);
read_unlock(&tasklist_lock);

- if (!sig_only) {
+ if (!user_only) {
wq_busy = freeze_workqueues_busy();
todo += wq_busy;
}
--
1.7.3.1


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