From: Rusty Russell <rusty@rustcorp.com.au>
Date: Sat, 31 Jan 2009 12:51:24 +0000 (+1030)
Subject: sched_rt: don't use first_cpu on cpumask created with cpumask_and
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=3d398703ef06fd97b4c28c86b580546d5b57e7b7;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git

sched_rt: don't use first_cpu on cpumask created with cpumask_and

cpumask_and() only initializes nr_cpu_ids bits, so the (deprecated)
first_cpu() might find one of those uninitialized bits if nr_cpu_ids
is less than NR_CPUS (as it can be for CONFIG_CPUMASK_OFFSTACK).

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

diff --git a/kernel/sched_rt.c b/kernel/sched_rt.c
index 954e1a81b796..bac1061cea2f 100644
--- a/kernel/sched_rt.c
+++ b/kernel/sched_rt.c
@@ -968,8 +968,8 @@ static inline int pick_optimal_cpu(int this_cpu, cpumask_t *mask)
 	if ((this_cpu != -1) && cpu_isset(this_cpu, *mask))
 		return this_cpu;
 
-	first = first_cpu(*mask);
-	if (first != NR_CPUS)
+	first = cpumask_first(mask);
+	if (first < nr_cpu_ids)
 		return first;
 
 	return -1;