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Commit 75f327c6 authored by Victor Aoqui's avatar Victor Aoqui Committed by Michael Ellerman
Browse files

powerpc/kernel: Avoid preemption check in iommu_range_alloc() 



Replace the __this_cpu_read() with raw_cpu_read() in
iommu_range_alloc(). Otherwise we get a warning about using
__this_cpu_read() in preemptible code:

  BUG: using __this_cpu_read() in preemptible
  caller is iommu_range_alloc+0xa8/0x3d0

Preemption doesn't need to be disabled since according to the comment
any CPU can safely use any IOMMU pool.

Signed-off-by: default avatarVictor Aoqui <victora@linux.vnet.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent 24be85a2

arch/powerpc/kernel/iommu.c

+1 −1
Original line number Diff line number Diff line
@@ -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);