From cd0bb41ea86027d3a5c3555772692323cbc05bc1 Mon Sep 17 00:00:00 2001 From: Kirti Wankhede Date: Wed, 3 Jun 2020 00:12:36 +0530 Subject: vfio iommu: Use shift operation for 64-bit integer division 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: d6a4c185660c ("vfio iommu: Implementation of ioctl for dirty pages tracking") Reported-by: kbuild test robot Signed-off-by: Kirti Wankhede Signed-off-by: Alex Williamson --- drivers/vfio/vfio_iommu_type1.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/vfio') diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c index a6d632d44c82..0e4e71799290 100644 --- a/drivers/vfio/vfio_iommu_type1.c +++ b/drivers/vfio/vfio_iommu_type1.c @@ -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); } } -- cgit v1.2.3