linux-kernel - [PATCH 3/4] vfio/spapr

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Message-Id: <1577634178-22530-4-git-send-email-Julia.Lawall@inria.fr>
Date:   Sun, 29 Dec 2019 16:42:57 +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 3/4] vfio/spapr_tce: 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/vfio_iommu_spapr_tce.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/vfio_iommu_spapr_tce.c b/drivers/vfio/vfio_iommu_spapr_tce.c
index 26cef65b41e7..16b3adc508db 100644
--- a/drivers/vfio/vfio_iommu_spapr_tce.c
+++ b/drivers/vfio/vfio_iommu_spapr_tce.c
@@ -79,7 +79,7 @@ static long tce_iommu_mm_set(struct tce_container *container)
 	}
 	BUG_ON(!current->mm);
 	container->mm = current->mm;
-	atomic_inc(&container->mm->mm_count);
+	mmgrab(container->mm);
 
 	return 0;
 }