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kthread: Convert worker lock to raw spinlock

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In order to enable the queuing of kthread work items from hardirq context
even when PREEMPT_RT_FULL is enabled, convert the worker spin_lock to a
raw_spin_lock.

This is only acceptable to do because the work performed under the lock is
well-bounded and minimal.

Reported-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Reported-by: Tim Sander <tim@krieglstein.org>
Signed-off-by: Julia Cartwright <julia@ni.com>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Steffen Trumtrar <s.trumtrar@pengutronix.de>
Reviewed-by: Petr Mladek <pmladek@suse.com>
Cc: Guenter Roeck <linux@roeck-us.net>
Link: https://lkml.kernel.org/r/20190212162554.19779-1-bigeasy@linutronix.de
This commit is contained in:
Julia Cartwright
2019-02-12 17:25:53 +01:00
committed by Thomas Gleixner
parent c89d92eddf
commit fe99a4f4d6
2 changed files with 23 additions and 23 deletions
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4
include/linux/kthread.h
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@@ -85,7 +85,7 @@ enum {
struct kthread_worker {
unsigned int flags;
spinlock_t lock;
raw_spinlock_t lock;
struct list_head work_list;
struct list_head delayed_work_list;
struct task_struct *task;
@@ -106,7 +106,7 @@ struct kthread_delayed_work {
};
#define KTHREAD_WORKER_INIT(worker) { \
.lock = __SPIN_LOCK_UNLOCKED((worker).lock), \
.lock = __RAW_SPIN_LOCK_UNLOCKED((worker).lock), \
.work_list = LIST_HEAD_INIT((worker).work_list), \
.delayed_work_list = LIST_HEAD_INIT((worker).delayed_work_list),\
}