linux-kernel - [PATCH 1/2] kthread: Add __kthread_should

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Message-Id: <20190128234625.78241-2-mka@chromium.org>
Date:   Mon, 28 Jan 2019 15:46:24 -0800
From:   Matthias Kaehlcke <mka@...omium.org>
To:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Steven Rostedt <rostedt@...dmis.org>,
        "Paul E . McKenney" <paulmck@...ux.vnet.ibm.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>
Cc:     linux-kernel@...r.kernel.org,
        Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>,
        Matthias Kaehlcke <mka@...omium.org>
Subject: [PATCH 1/2] kthread: Add __kthread_should_park()

The existing kthread_should_park() is used to check if the calling
kthread ('current') should park. The new __kthread_should_park()
receives a task_struct as parameter to check if the corresponding
kernel thread should be parked. Call __kthread_should_park() from
kthread_should_park() to avoid code duplication.

Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
---
I'm not overly happy about the function name with the double
underscore prefix, but couldn't come up with anything better. I'm
open to suggestions :)
---
 include/linux/kthread.h | 1 +
 kernel/kthread.c        | 8 +++++++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index c1961761311db..1577a2d56e9d4 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -56,6 +56,7 @@ void kthread_bind_mask(struct task_struct *k, const struct cpumask *mask);
 int kthread_stop(struct task_struct *k);
 bool kthread_should_stop(void);
 bool kthread_should_park(void);
+bool __kthread_should_park(struct task_struct *k);
 bool kthread_freezable_should_stop(bool *was_frozen);
 void *kthread_data(struct task_struct *k);
 void *kthread_probe_data(struct task_struct *k);
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 087d18d771b53..65234c89d85b4 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -101,6 +101,12 @@ bool kthread_should_stop(void)
 }
 EXPORT_SYMBOL(kthread_should_stop);
 
+bool __kthread_should_park(struct task_struct *k)
+{
+	return test_bit(KTHREAD_SHOULD_PARK, &to_kthread(k)->flags);
+}
+EXPORT_SYMBOL_GPL(__kthread_should_park);
+
 /**
  * kthread_should_park - should this kthread park now?
  *
@@ -114,7 +120,7 @@ EXPORT_SYMBOL(kthread_should_stop);
  */
 bool kthread_should_park(void)
 {
-	return test_bit(KTHREAD_SHOULD_PARK, &to_kthread(current)->flags);
+	return __kthread_should_park(current);
 }
 EXPORT_SYMBOL_GPL(kthread_should_park);
 
-- 
2.20.1.495.gaa96b0ce6b-goog