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sched: Fix boot crash by zalloc()ing most of the cpu masks

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I got a boot crash when forcing cpumasks offstack on 32 bit,
because find_new_ilb() returned 3 on my UP system (nohz.cpu_mask
wasn't zeroed).

AFAICT the others need to be zeroed too: only
nohz.ilb_grp_nohz_mask is initialized before use.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: Peter Zijlstra <peterz@infradead.org>
LKML-Reference: <200911022037.21282.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Rusty Russell 2009-11-02 20:37:20 +10:30 committed by Ingo Molnar
parent f685ceacab
commit 49557e6203
1 changed files with 3 additions and 3 deletions
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6
kernel/sched.c
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@ -9535,13 +9535,13 @@ void __init sched_init(void)
current->sched_class = &fair_sched_class; current->sched_class = &fair_sched_class;
/* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */ /* Allocate the nohz_cpu_mask if CONFIG_CPUMASK_OFFSTACK */
alloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT); zalloc_cpumask_var(&nohz_cpu_mask, GFP_NOWAIT);
#ifdef CONFIG_SMP #ifdef CONFIG_SMP
#ifdef CONFIG_NO_HZ #ifdef CONFIG_NO_HZ
alloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT); zalloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT); alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT);
#endif #endif
alloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT); zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
#endif /* SMP */ #endif /* SMP */
perf_event_init(); perf_event_init();