linux-kernel - [PATCH 2/4] vfio: vfio_pci

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Date:   Sun, 29 Dec 2019 16:42:56 +0100
From:   Julia Lawall <Julia.Lawall@...ia.fr>
To:     Alex Williamson <alex.williamson@...hat.com>
Cc:     kernel-janitors@...r.kernel.org, Cornelia Huck <cohuck@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/4] vfio: vfio_pci_nvlink2: use mmgrab

Mmgrab was introduced in commit f1f1007644ff ("mm: add new mmgrab()
helper") and most of the kernel was updated to use it. Update a
remaining file.

The semantic patch that makes this change is as follows:
(http://coccinelle.lip6.fr/)

<smpl>
@@ expression e; @@
- atomic_inc(&e->mm_count);
+ mmgrab(e);
</smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...ia.fr>

---
 drivers/vfio/pci/vfio_pci_nvlink2.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_nvlink2.c b/drivers/vfio/pci/vfio_pci_nvlink2.c
index f2983f0f84be..43df10af7f66 100644
--- a/drivers/vfio/pci/vfio_pci_nvlink2.c
+++ b/drivers/vfio/pci/vfio_pci_nvlink2.c
@@ -159,7 +159,7 @@ static int vfio_pci_nvgpu_mmap(struct vfio_pci_device *vdev,
 	data->useraddr = vma->vm_start;
 	data->mm = current->mm;
 
-	atomic_inc(&data->mm->mm_count);
+	mmgrab(data->mm);
 	ret = (int) mm_iommu_newdev(data->mm, data->useraddr,
 			vma_pages(vma), data->gpu_hpa, &data->mem);