mirror of
https://github.com/linuxkit/linuxkit.git
synced 2025-07-31 06:32:06 +00:00
29 lines
988 B
Diff
29 lines
988 B
Diff
From: Thomas Gleixner <tglx@linutronix.de>
|
|
Date: Tue, 9 Mar 2021 09:42:04 +0100
|
|
Subject: [PATCH 01/20] tasklets: Replace barrier() with cpu_relax() in
|
|
tasklet_unlock_wait()
|
|
|
|
A barrier() in a tight loop which waits for something to happen on a remote
|
|
CPU is a pointless exercise. Replace it with cpu_relax() which allows HT
|
|
siblings to make progress.
|
|
|
|
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
|
|
Tested-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
|
|
---
|
|
include/linux/interrupt.h | 3 ++-
|
|
1 file changed, 2 insertions(+), 1 deletion(-)
|
|
|
|
--- a/include/linux/interrupt.h
|
|
+++ b/include/linux/interrupt.h
|
|
@@ -677,7 +677,8 @@ static inline void tasklet_unlock(struct
|
|
|
|
static inline void tasklet_unlock_wait(struct tasklet_struct *t)
|
|
{
|
|
- while (test_bit(TASKLET_STATE_RUN, &(t)->state)) { barrier(); }
|
|
+ while (test_bit(TASKLET_STATE_RUN, &t->state))
|
|
+ cpu_relax();
|
|
}
|
|
#else
|
|
#define tasklet_trylock(t) 1
|