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powerpc: fix memory corruption by pnv_alloc_idle_core_states 

Space allocated for paca is based off nr_cpu_ids,
but pnv_alloc_idle_core_states() iterates paca with
cpu_nr_cores()*threads_per_core, which is using NR_CPUS.

This causes pnv_alloc_idle_core_states() to write over memory,
which is outside of paca array and may later lead to various panics.

Fixes: 7cba160ad7 (powernv/cpuidle: Redesign idle states management)
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Jan Stancek 2015-03-31 18:11:46 +02:00 committed by Michael Ellerman
parent e42391cd04
commit d52356e7f4
1 changed files with 1 additions and 1 deletions
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2
arch/powerpc/include/asm/cputhreads.h
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@ -55,7 +55,7 @@ static inline cpumask_t cpu_thread_mask_to_cores(const struct cpumask *threads)
static inline int cpu_nr_cores(void)
{
return NR_CPUS >> threads_shift;
return nr_cpu_ids >> threads_shift;
}
static inline cpumask_t cpu_online_cores_map(void)