[PATCH v3 09/13] sched: Avoid signed comparison of preempt_count() in __cant_migrate()

Currently preempt_count() is always a non-negative int on all archs
(PREEMPT_NEED_RESCHED archs will mask out the MSB when return
preempt_count()), hence the checking in __cant_migrate() is in fact just
checking whether preempt_count() is 0 or not. In a future change, we are
going to use all the 32 bits of preempt_count(), which would make
negative int values possible from preempt_count(). Therefore convert the
"> 0" comparison into a zero checking to prepare for the future change.
No functional changes are intended.

Signed-off-by: Boqun Feng <[email protected]>
---
 kernel/sched/core.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 75dba7cc09bd..636e6a15f104 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -9207,7 +9207,7 @@ void __cant_migrate(const char *file, int line)
 	if (!IS_ENABLED(CONFIG_PREEMPT_COUNT))
 		return;
 
-	if (preempt_count() > 0)
+	if (preempt_count())
 		return;
 
 	if (time_before(jiffies, prev_jiffy + HZ) && prev_jiffy)
-- 
2.51.0