sched: Fix isolcpus boot option
Anton Blanchard wrote:
> We allocate and zero cpu_isolated_map after the isolcpus
> __setup option has run. This means cpu_isolated_map always
> ends up empty and if CPUMASK_OFFSTACK is enabled we write to a
> cpumask that hasn't been allocated.
I introduced this regression in 49557e6203
(sched: Fix
boot crash by zalloc()ing most of the cpu masks).
Use the bootmem allocator if they set isolcpus=, otherwise
allocate and zero like normal.
Reported-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: peterz@infradead.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: <stable@kernel.org>
LKML-Reference: <200912021409.17013.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Anton Blanchard <anton@samba.org>
This commit is contained in:
Родитель
8592e6486a
Коммит
bdddd2963c
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@ -8061,6 +8061,7 @@ static cpumask_var_t cpu_isolated_map;
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/* Setup the mask of cpus configured for isolated domains */
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static int __init isolated_cpu_setup(char *str)
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{
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alloc_bootmem_cpumask_var(&cpu_isolated_map);
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cpulist_parse(str, cpu_isolated_map);
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return 1;
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}
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@ -9609,7 +9610,9 @@ void __init sched_init(void)
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zalloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT);
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alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT);
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#endif
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zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
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/* May be allocated at isolcpus cmdline parse time */
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if (cpu_isolated_map == NULL)
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zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
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#endif /* SMP */
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perf_event_init();
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