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Subject[PATCH] powerpc/kernel: Avoid preemption check during iommu_range_alloc
Date
Replaced __this_cpu_read function call by raw_cpu_read in
iommu_range_alloc function.
Preemption doesn't need to be disabled since any CPU can safely
use IOMMU pool.

Signed-off-by: Victor Aoqui <victora@linux.vnet.ibm.com>
---
arch/powerpc/kernel/iommu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/powerpc/kernel/iommu.c b/arch/powerpc/kernel/iommu.c
index 233ca3f..0e49a45 100644
--- a/arch/powerpc/kernel/iommu.c
+++ b/arch/powerpc/kernel/iommu.c
@@ -208,7 +208,7 @@ static unsigned long iommu_range_alloc(struct device *dev,
* We don't need to disable preemption here because any CPU can
* safely use any IOMMU pool.
*/
- pool_nr = __this_cpu_read(iommu_pool_hash) & (tbl->nr_pools - 1);
+ pool_nr = raw_cpu_read(iommu_pool_hash) & (tbl->nr_pools - 1);

if (largealloc)
pool = &(tbl->large_pool);
--
1.8.3.1
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