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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-12-02 14:09:16 +1030 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-12-02 10:27:16 +0100 |
| commit | bdddd2963c0264c56f18043f6fa829d3c1d3d1c0 (patch) | |
| tree | b3d886be91ddcf99e3b83c120aedebb840ff75df /kernel/sched.c | |
| parent | 8592e6486a177a02f048567cb928bc3a1f9a86c3 (diff) | |
| download | lwn-bdddd2963c0264c56f18043f6fa829d3c1d3d1c0.tar.gz lwn-bdddd2963c0264c56f18043f6fa829d3c1d3d1c0.zip | |
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 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 <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>
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 1031cae39c4c..4883fee99314 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; } @@ -9609,7 +9610,9 @@ 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(); |