Messages in this thread Patch in this message | | | Date | Tue, 26 Jan 2010 15:33:54 -0800 | From | Greg KH <> | Subject | [28/98] sched: Fix isolcpus boot option |
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2.6.32-stable review patch. If anyone has any objections, please let us know.
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From: Rusty Russell <rusty@rustcorp.com.au>
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> 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>
--- kernel/sched.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
--- 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();
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