Messages in this thread Patch in this message | | | From | Byungchul Park <> | Subject | [PATCH 2/2] sched/deadline: Don't return invalid cpu in cpudl_maximum_cpu() | Date | Fri, 2 Jun 2017 16:31:03 +0900 |
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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.park@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
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