From: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Retry loops on RT might loop forever when the modifying side was
preempted. Use cpu_chill() instead of cpu_relax() to let the system
make progress.
Signed-off-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: stable-rt@xxxxxxxxxxxxxxx
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
net/rds/ib_rdma.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/net/rds/ib_rdma.c b/net/rds/ib_rdma.c
index 819c35a..256ad87 100644
--- a/net/rds/ib_rdma.c
+++ b/net/rds/ib_rdma.c
@@ -33,6 +33,7 @@
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/rculist.h>
+#include <linux/delay.h>
#include "rds.h"
#include "ib.h"
@@ -294,7 +295,7 @@ static inline void wait_clean_list_grace(void)
for_each_online_cpu(cpu) {
flag = &per_cpu(clean_list_grace, cpu);
while (test_bit(CLEAN_LIST_BUSY_BIT, flag))
- cpu_relax();
+ cpu_chill();
}
}
--
1.7.8.3
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