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vfio iommu: Use shift operation for 64-bit integer division

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Fixes compilation error with ARCH=i386.

Error fixed by this commit:
ld: drivers/vfio/vfio_iommu_type1.o: in function `vfio_dma_populate_bitmap':
>> vfio_iommu_type1.c:(.text+0x666): undefined reference to `__udivdi3'

Fixes: d6a4c18566 ("vfio iommu: Implementation of ioctl for dirty pages tracking")
Reported-by: kbuild test robot <lkp@intel.com>
Signed-off-by: Kirti Wankhede <kwankhede@nvidia.com>
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
This commit is contained in:
Kirti Wankhede 2020-06-03 00:12:36 +05:30 committed by Alex Williamson
parent 95fc87b441
commit cd0bb41ea8
1 changed files with 2 additions and 1 deletions
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3
drivers/vfio/vfio_iommu_type1.c
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@ -227,11 +227,12 @@ static void vfio_dma_bitmap_free(struct vfio_dma *dma)
static void vfio_dma_populate_bitmap(struct vfio_dma *dma, size_t pgsize)
{
struct rb_node *p;
unsigned long pgshift = __ffs(pgsize);
for (p = rb_first(&dma->pfn_list); p; p = rb_next(p)) {
struct vfio_pfn *vpfn = rb_entry(p, struct vfio_pfn, node);
bitmap_set(dma->bitmap, (vpfn->iova - dma->iova) / pgsize, 1);
bitmap_set(dma->bitmap, (vpfn->iova - dma->iova) >> pgshift, 1);
}
}