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

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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>
This commit is contained in:
Rusty Russell 2009-01-31 23:21:24 +10:30 committed by Ingo Molnar
parent a571bbeafb
commit 3d398703ef
1 changed files with 2 additions and 2 deletions
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4
kernel/sched_rt.c
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@ -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;