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-rw-r--r--include/linux/sched.h8
-rw-r--r--kernel/sched/core.c33
2 files changed, 31 insertions, 10 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 94a48bb58297..a8daed914eef 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -461,12 +461,10 @@ extern signed long schedule_timeout_idle(signed long timeout);
asmlinkage void schedule(void);
extern void schedule_preempt_disabled(void);
+extern int __must_check io_schedule_prepare(void);
+extern void io_schedule_finish(int token);
extern long io_schedule_timeout(long timeout);
-
-static inline void io_schedule(void)
-{
- io_schedule_timeout(MAX_SCHEDULE_TIMEOUT);
-}
+extern void io_schedule(void);
void __noreturn do_task_dead(void);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 9fd37169b302..49ce1cb3d320 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -5128,25 +5128,48 @@ out_irq:
}
EXPORT_SYMBOL_GPL(yield_to);
+int io_schedule_prepare(void)
+{
+ int old_iowait = current->in_iowait;
+
+ current->in_iowait = 1;
+ blk_schedule_flush_plug(current);
+
+ return old_iowait;
+}
+
+void io_schedule_finish(int token)
+{
+ current->in_iowait = token;
+}
+
/*
* This task is about to go to sleep on IO. Increment rq->nr_iowait so
* that process accounting knows that this is a task in IO wait state.
*/
long __sched io_schedule_timeout(long timeout)
{
- int old_iowait = current->in_iowait;
+ int token;
long ret;
- current->in_iowait = 1;
- blk_schedule_flush_plug(current);
-
+ token = io_schedule_prepare();
ret = schedule_timeout(timeout);
- current->in_iowait = old_iowait;
+ io_schedule_finish(token);
return ret;
}
EXPORT_SYMBOL(io_schedule_timeout);
+void io_schedule(void)
+{
+ int token;
+
+ token = io_schedule_prepare();
+ schedule();
+ io_schedule_finish(token);
+}
+EXPORT_SYMBOL(io_schedule);
+
/**
* sys_sched_get_priority_max - return maximum RT priority.
* @policy: scheduling class.