4.19.59-rt24-rc1 stable review patch.
If anyone has any objections, please let me know.
--
From: Sebastian Andrzej Siewior
[ Upstream commit 0532e87d9d44795221aa921ba7024bde689cc894 ]
Add kthread_schedule_work() which uses a global kthread for all its
jobs.
Split the cgroup include to avoid recussive includes from interrupt.h.
Fixup everything that fails to build (and did not include all header).
Signed-off-by: Sebastian Andrzej Siewior
Signed-off-by: Steven Rostedt (VMware)
---
drivers/block/loop.c | 2 +-
drivers/spi/spi-rockchip.c | 1 +
include/linux/kthread-cgroup.h | 17 +
include/linux/kthread.h| 17 +++--
init/main.c| 1 +
kernel/kthread.c | 14 ++
6 files changed, 41 insertions(+), 11 deletions(-)
create mode 100644 include/linux/kthread-cgroup.h
diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index f1e63eb7cbca..aa76c816dbb4 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -70,7 +70,7 @@
#include
#include
#include
-#include
+#include
#include
#include
#include
diff --git a/drivers/spi/spi-rockchip.c b/drivers/spi/spi-rockchip.c
index fdcf3076681b..b56619418cea 100644
--- a/drivers/spi/spi-rockchip.c
+++ b/drivers/spi/spi-rockchip.c
@@ -22,6 +22,7 @@
#include
#include
#include
+#include
#define DRIVER_NAME "rockchip-spi"
diff --git a/include/linux/kthread-cgroup.h b/include/linux/kthread-cgroup.h
new file mode 100644
index ..53d34bca9d72
--- /dev/null
+++ b/include/linux/kthread-cgroup.h
@@ -0,0 +1,17 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_KTHREAD_CGROUP_H
+#define _LINUX_KTHREAD_CGROUP_H
+#include
+#include
+
+#ifdef CONFIG_BLK_CGROUP
+void kthread_associate_blkcg(struct cgroup_subsys_state *css);
+struct cgroup_subsys_state *kthread_blkcg(void);
+#else
+static inline void kthread_associate_blkcg(struct cgroup_subsys_state *css) { }
+static inline struct cgroup_subsys_state *kthread_blkcg(void)
+{
+ return NULL;
+}
+#endif
+#endif
diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index ad292898f7f2..7cf56eb54103 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -4,7 +4,6 @@
/* Simple interface for creating and stopping kernel threads without mess. */
#include
#include
-#include
__printf(4, 5)
struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
@@ -106,7 +105,7 @@ 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),\
}
@@ -198,14 +197,12 @@ bool kthread_cancel_delayed_work_sync(struct
kthread_delayed_work *work);
void kthread_destroy_worker(struct kthread_worker *worker);
-#ifdef CONFIG_BLK_CGROUP
-void kthread_associate_blkcg(struct cgroup_subsys_state *css);
-struct cgroup_subsys_state *kthread_blkcg(void);
-#else
-static inline void kthread_associate_blkcg(struct cgroup_subsys_state *css) { }
-static inline struct cgroup_subsys_state *kthread_blkcg(void)
+extern struct kthread_worker kthread_global_worker;
+void kthread_init_global_worker(void);
+
+static inline bool kthread_schedule_work(struct kthread_work *work)
{
- return NULL;
+ return kthread_queue_work(_global_worker, work);
}
-#endif
+
#endif /* _LINUX_KTHREAD_H */
diff --git a/init/main.c b/init/main.c
index 4a7471606e53..b0e95351c22c 100644
--- a/init/main.c
+++ b/init/main.c
@@ -1130,6 +1130,7 @@ static noinline void __init kernel_init_freeable(void)
smp_prepare_cpus(setup_max_cpus);
workqueue_init();
+ kthread_init_global_worker();
init_mm_internals();
diff --git a/kernel/kthread.c b/kernel/kthread.c
index 5641b55783a6..9db017761a1f 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -20,6 +20,7 @@
#include
#include
#include
+#include
#include
static DEFINE_SPINLOCK(kthread_create_lock);
@@ -1180,6 +1181,19 @@ void kthread_destroy_worker(struct kthread_worker
*worker)
}
EXPORT_SYMBOL(kthread_destroy_worker);
+DEFINE_KTHREAD_WORKER(kthread_global_worker);
+EXPORT_SYMBOL(kthread_global_worker);
+
+__init void kthread_init_global_worker(void)
+{
+ kthread_global_worker.task = kthread_create(kthread_worker_fn,
+ _global_worker,
+ "kswork");
+ if (WARN_ON(IS_ERR(kthread_global_worker.task)))
+ return;
+ wake_up_process(kthread_global_worker.task);
+}
+
#ifdef CONFIG_BLK_CGROUP
/**
* kthread_associate_blkcg - associate blkcg to current kthread
--
2.20.1
