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authorRusty Russell <rusty@rustcorp.com.au>2009-12-02 14:09:16 +1030
committerIngo Molnar <mingo@elte.hu>2009-12-02 10:27:16 +0100
commitbdddd2963c0264c56f18043f6fa829d3c1d3d1c0 (patch)
treeb3d886be91ddcf99e3b83c120aedebb840ff75df
parent8592e6486a177a02f048567cb928bc3a1f9a86c3 (diff)
downloadop-kernel-dev-bdddd2963c0264c56f18043f6fa829d3c1d3d1c0.zip
op-kernel-dev-bdddd2963c0264c56f18043f6fa829d3c1d3d1c0.tar.gz
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>
-rw-r--r--kernel/sched.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 1031cae..4883fee 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();
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