diff options
| author | Jan Stancek <jstancek@redhat.com> | 2015-03-31 18:11:46 +0200 |
|---|---|---|
| committer | Sasha Levin <sasha.levin@oracle.com> | 2015-04-23 14:58:27 -0400 |
| commit | 70213cdd6bf259a1844a7498e360cc1adbd5c306 (patch) | |
| tree | 5fbd20f16f758f1a12d2bc6236b42c00511c6f8f /arch/powerpc | |
| parent | 604696d8b5d9ebf2f5af9bf46ac76519b831435f (diff) | |
powerpc: fix memory corruption by pnv_alloc_idle_core_states
[ Upstream commit d52356e7f48e400ca258c6763a232a92fa82ff68 ]
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: 7cba160ad789 (powernv/cpuidle: Redesign idle states management)
Signed-off-by: Jan Stancek <jstancek@redhat.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sasha.levin@oracle.com>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/include/asm/cputhreads.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/powerpc/include/asm/cputhreads.h b/arch/powerpc/include/asm/cputhreads.h index 2bf8e9307be9..4c8ad592ae33 100644 --- a/arch/powerpc/include/asm/cputhreads.h +++ b/arch/powerpc/include/asm/cputhreads.h @@ -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) |