sched: fix mult overflow
It was observed these mults can overflow.
Signed-off-by: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 0d197be..26ebe18 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -1477,7 +1477,7 @@
struct cfs_rq *busiest_cfs_rq = tg->cfs_rq[busiest_cpu];
unsigned long busiest_h_load = busiest_cfs_rq->h_load;
unsigned long busiest_weight = busiest_cfs_rq->load.weight;
- long rem_load, moved_load;
+ u64 rem_load, moved_load;
/*
* empty group
@@ -1485,8 +1485,8 @@
if (!busiest_cfs_rq->task_weight)
continue;
- rem_load = rem_load_move * busiest_weight;
- rem_load /= busiest_h_load + 1;
+ rem_load = (u64)rem_load_move * busiest_weight;
+ rem_load = div_u64(rem_load, busiest_h_load + 1);
moved_load = __load_balance_fair(this_rq, this_cpu, busiest,
rem_load, sd, idle, all_pinned, this_best_prio,
@@ -1496,7 +1496,7 @@
continue;
moved_load *= busiest_h_load;
- moved_load /= busiest_weight + 1;
+ moved_load = div_u64(moved_load, busiest_weight + 1);
rem_load_move -= moved_load;
if (rem_load_move < 0)