linux-kernel - [PATCH 3/4] sched/core: have io_schedule

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Date: Tue, 16 Apr 2024 06:11:20 -0600
From: Jens Axboe <axboe@...nel.dk>
To: linux-kernel@...r.kernel.org
Cc: peterz@...radead.org,
	tglx@...utronix.de,
	Jens Axboe <axboe@...nel.dk>
Subject: [PATCH 3/4] sched/core: have io_schedule_prepare() return a long

In preparation for needing more state then 32-bit on 64-bit archs,
switch it to a long instead.

Signed-off-by: Jens Axboe <axboe@...nel.dk>
---
 block/blk-cgroup.c           | 2 +-
 include/linux/sched.h        | 4 ++--
 kernel/locking/mutex.c       | 4 ++--
 kernel/locking/rtmutex_api.c | 4 ++--
 kernel/sched/core.c          | 6 +++---
 5 files changed, 10 insertions(+), 10 deletions(-)

diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index bdbb557feb5a..77faceddd5dd 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -1849,7 +1849,7 @@ static void blkcg_maybe_throttle_blkg(struct blkcg_gq *blkg, bool use_memdelay)
 	u64 now = blk_time_get_ns();
 	u64 exp;
 	u64 delay_nsec = 0;
-	int tok;
+	long tok;
 
 	while (blkg->parent) {
 		int use_delay = atomic_read(&blkg->use_delay);
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3c2abbc587b4..dcfc2830ed8e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -317,8 +317,8 @@ asmlinkage void preempt_schedule_irq(void);
  extern void schedule_rtlock(void);
 #endif
 
-extern int __must_check io_schedule_prepare(void);
-extern void io_schedule_finish(int token);
+extern long __must_check io_schedule_prepare(void);
+extern void io_schedule_finish(long token);
 extern long io_schedule_timeout(long timeout);
 extern void io_schedule(void);
 
diff --git a/kernel/locking/mutex.c b/kernel/locking/mutex.c
index cbae8c0b89ab..4a86ea6c7f19 100644
--- a/kernel/locking/mutex.c
+++ b/kernel/locking/mutex.c
@@ -830,7 +830,7 @@ EXPORT_SYMBOL_GPL(mutex_lock_interruptible_nested);
 void __sched
 mutex_lock_io_nested(struct mutex *lock, unsigned int subclass)
 {
-	int token;
+	long token;
 
 	might_sleep();
 
@@ -1026,7 +1026,7 @@ EXPORT_SYMBOL(mutex_lock_killable);
  */
 void __sched mutex_lock_io(struct mutex *lock)
 {
-	int token;
+	long token;
 
 	token = io_schedule_prepare();
 	mutex_lock(lock);
diff --git a/kernel/locking/rtmutex_api.c b/kernel/locking/rtmutex_api.c
index a6974d044593..ddf7f7f3f0b5 100644
--- a/kernel/locking/rtmutex_api.c
+++ b/kernel/locking/rtmutex_api.c
@@ -547,7 +547,7 @@ EXPORT_SYMBOL_GPL(mutex_lock_killable_nested);
 
 void __sched mutex_lock_io_nested(struct mutex *lock, unsigned int subclass)
 {
-	int token;
+	long token;
 
 	might_sleep();
 
@@ -579,7 +579,7 @@ EXPORT_SYMBOL(mutex_lock_killable);
 
 void __sched mutex_lock_io(struct mutex *lock)
 {
-	int token = io_schedule_prepare();
+	long token = io_schedule_prepare();
 
 	__mutex_lock_common(lock, TASK_UNINTERRUPTIBLE, 0, NULL, _RET_IP_);
 	io_schedule_finish(token);
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 6a6c985220b1..63f6d44f460c 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9032,16 +9032,16 @@ int __sched yield_to(struct task_struct *p, bool preempt)
 }
 EXPORT_SYMBOL_GPL(yield_to);
 
-int io_schedule_prepare(void)
+long io_schedule_prepare(void)
 {
-	int old_iowait = current->in_iowait;
+	long old_iowait = current->in_iowait;
 
 	current->in_iowait = 1;
 	blk_flush_plug(current->plug, true);
 	return old_iowait;
 }
 
-void io_schedule_finish(int token)
+void io_schedule_finish(long token)
 {
 	current->in_iowait = token;
 }
-- 
2.43.0