When the heap tree is empty, cp->elements[0].cpu has meaningless value.
We need to consider the case.
Signed-off-by: Byungchul Park <byungchul.p...@lge.com>
---
kernel/sched/cpudeadline.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/kernel/sched/cpudeadline.c b/kernel/sched/cpudeadline.c
index d4a6963..9b314a9 100644
--- a/kernel/sched/cpudeadline.c
+++ b/kernel/sched/cpudeadline.c
@@ -110,7 +110,8 @@ static void cpudl_heapify(struct cpudl *cp, int idx)
static inline int cpudl_maximum_cpu(struct cpudl *cp)
{
- return cp->elements[0].cpu;
+ int cpu = cp->elements[0].cpu;
+ return cp->elements[cpu].idx == IDX_INVALID ? -1 : cpu;
}
static inline u64 cpudl_maximum_dl(struct cpudl *cp)
--
1.9.1
