[tip: irq/core] tasklets: Use spin wait in tasklet_disable() temporarily

tip-bot2 for Thomas Gleixner
2021-03-17T15:50:53Z

The following commit has been merged into the irq/core branch of tip:

Commit-ID: b0cd02c2a9494dbf0a1cc7dc7a3b8b400c158d37
Gitweb: https://git.kernel.org/tip/b0cd02c2a9494dbf0a1cc7dc7a3b8b400c158d37
Author: Thomas Gleixner <tglx@linutronix.de>
AuthorDate: Tue, 09 Mar 2021 09:42:07 +01:00
Committer: Thomas Gleixner <tglx@linutronix.de>
CommitterDate: Wed, 17 Mar 2021 16:33:54 +01:00

tasklets: Use spin wait in tasklet_disable() temporarily

To ease the transition use spin waiting in tasklet_disable() until all
usage sites from atomic context have been cleaned up.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210309084241.685352806@linutronix.de

---
include/linux/interrupt.h | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/include/linux/interrupt.h b/include/linux/interrupt.h
index 3c8a291..b7f0012 100644
--- a/include/linux/interrupt.h
+++ b/include/linux/interrupt.h
@@ -728,7 +728,8 @@ static inline void tasklet_disable_in_atomic(struct tasklet_struct *t)
static inline void tasklet_disable(struct tasklet_struct *t)
{
tasklet_disable_nosync(t);
- tasklet_unlock_wait(t);
+ /* Spin wait until all atomic users are converted */
+ tasklet_unlock_spin_wait(t);
smp_mb();
}