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Commit 30d383d4 authored by Olav Haugan's avatar Olav Haugan
Browse files

sched: Fix overflow in max possible capacity calculation 



The max possible capacity calculation might overflow given large enough
max possible frequency and capacity. Fix potential for overflow.

Change-Id: Ie9345bc657988845aeb450d922052550cca48a5f
Signed-off-by: default avatarOlav Haugan <ohaugan@codeaurora.org>
parent 7dd02a88

kernel/sched/core.c

+4 −2
Original line number Diff line number Diff line
@@ -2442,10 +2442,12 @@ static int cpufreq_notifier_policy(struct notifier_block *nb, 
	pre_big_small_task_count_change(cpu_possible_mask);

	for_each_cpu(i, cpus) {

		struct rq *rq = cpu_rq(i);

		u64 max_possible_capacity;



		rq->capacity = compute_capacity(i);

		rq->max_possible_capacity = rq->capacity *

				rq->max_possible_freq / rq->max_freq;

		max_possible_capacity = div_u64(((u64) rq->capacity) *

					rq->max_possible_freq, rq->max_freq);

		rq->max_possible_capacity = (int) max_possible_capacity;

		rq->load_scale_factor = compute_load_scale_factor(i);

	}