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Tue, 2 Jun 2020 19:54:50 +0000 (UTC) Date: Tue, 2 Jun 2020 13:54:48 -0600 From: Alex Williamson To: Kirti Wankhede Subject: Re: [PATCH 1/2] vfio iommu: Use shift operation for 64-bit integer division Message-ID: <20200602135448.56707f25@x1.home> In-Reply-To: <1591123357-18297-1-git-send-email-kwankhede@nvidia.com> References: <1591123357-18297-1-git-send-email-kwankhede@nvidia.com> Organization: Red Hat MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Received-SPF: pass client-ip=207.211.31.81; envelope-from=alex.williamson@redhat.com; helo=us-smtp-delivery-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/02 15:54:57 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Zhengxiao.zx@Alibaba-inc.com, kevin.tian@intel.com, yi.l.liu@intel.com, cjia@nvidia.com, kvm@vger.kernel.org, eskultet@redhat.com, ziye.yang@intel.com, qemu-devel@nongnu.org, cohuck@redhat.com, shuangtai.tst@alibaba-inc.com, dgilbert@redhat.com, zhi.a.wang@intel.com, mlevitsk@redhat.com, pasic@linux.ibm.com, aik@ozlabs.ru, eauger@redhat.com, felipe@nutanix.com, jonathan.davies@nutanix.com, yan.y.zhao@intel.com, changpeng.liu@intel.com, Ken.Xue@amd.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On Wed, 3 Jun 2020 00:12:36 +0530 Kirti Wankhede wrote: > 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) > > Signed-off-by: Kirti Wankhede > Reported-by: kbuild test robot > --- > drivers/vfio/vfio_iommu_type1.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/drivers/vfio/vfio_iommu_type1.c b/drivers/vfio/vfio_iommu_type1.c > index 97a29bc04d5d..9d9c8709a24c 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); > } > } > Applied and pushed both to the vfio next branch. Thanks! Alex