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| author | Rusty Russell <rusty@rustcorp.com.au> | 2009-12-02 14:09:16 +1030 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-12-08 10:22:06 -0800 |
| commit | b4b4c13e3bb21e3c5f193b395dbb9c1a1202f399 (patch) | |
| tree | 48ad49f02f34d0ec21590f05470c7e712aca10d3 | |
| parent | 8526322d0f88031465b2235c9e18a9f242dd6669 (diff) | |
| download | linux-stable-b4b4c13e3bb21e3c5f193b395dbb9c1a1202f399.tar.gz linux-stable-b4b4c13e3bb21e3c5f193b395dbb9c1a1202f399.tar.bz2 linux-stable-b4b4c13e3bb21e3c5f193b395dbb9c1a1202f399.zip | |
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 <anton@samba.org>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Cc: peterz@infradead.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
LKML-Reference: <200912021409.17013.rusty@rustcorp.com.au>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Tested-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -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 4f675e4c7d5d..81ede13d2238 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -7945,6 +7945,7 @@ 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; } @@ -9389,7 +9390,9 @@ 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_counter_init(); |