Commit 5c2fefd8 authored Oct 02, 2017 by Alexey Kardashevskiy Committed by Alex Williamson Oct 02, 2017

vfio/spapr: Add cond_resched() for huge updates



Clearing very big IOMMU tables can trigger soft lockups. This adds
cond_resched() to allow the scheduler to do context switching when
it decides to.

Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>

parent cf0d53ba

drivers/vfio/vfio_iommu_spapr_tce.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -507,6 +507,8 @@ static int tce_iommu_clear(struct tce_container *container,
		enum dma_data_direction direction;

		for ( ; pages; --pages, ++entry) {
		cond_resched();

		direction = DMA_NONE;
		oldhpa = 0;
		ret = iommu_tce_xchg(tbl, entry, &oldhpa, &direction);