From: Rusty Russell Date: Wed, 2 Dec 2009 03:39:16 +0000 (+1030) Subject: sched: Fix isolcpus boot option X-Git-Tag: v2.6.32.7~73 X-Git-Url: https://git.fsl.cs.sunysb.edu/?a=commitdiff_plain;h=08b84be9e906f97340acbf6c5daaa53bbf4fa194;p=unionfs-2.6.39.y.git sched: Fix isolcpus boot option commit bdddd2963c0264c56f18043f6fa829d3c1d3d1c0 upstream. 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 49557e620339cb13 (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 Signed-off-by: Rusty Russell Cc: peterz@infradead.org Cc: Linus Torvalds Cc: LKML-Reference: <200912021409.17013.rusty@rustcorp.com.au> Signed-off-by: Ingo Molnar Tested-by: Anton Blanchard --- diff --git a/kernel/sched.c b/kernel/sched.c index bf841d85b9b..ab15840d395 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -8061,6 +8061,7 @@ static cpumask_var_t cpu_isolated_map; /* Setup the mask of cpus configured for isolated domains */ static int __init isolated_cpu_setup(char *str) { + alloc_bootmem_cpumask_var(&cpu_isolated_map); cpulist_parse(str, cpu_isolated_map); return 1; } @@ -9591,7 +9592,9 @@ void __init sched_init(void) zalloc_cpumask_var(&nohz.cpu_mask, GFP_NOWAIT); alloc_cpumask_var(&nohz.ilb_grp_nohz_mask, GFP_NOWAIT); #endif - zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT); + /* May be allocated at isolcpus cmdline parse time */ + if (cpu_isolated_map == NULL) + zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT); #endif /* SMP */ perf_event_init();