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

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Message-ID: <20200106160507.3fc1712a@w520.home>
Date:   Mon, 6 Jan 2020 16:05:07 -0700
From:   Alex Williamson <alex.williamson@...hat.com>
To:     Julia Lawall <Julia.Lawall@...ia.fr>
Cc:     kernel-janitors@...r.kernel.org, Cornelia Huck <cohuck@...hat.com>,
        kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/4] vfio/spapr_tce: use mmgrab

On Sun, 29 Dec 2019 16:42:57 +0100
Julia Lawall <Julia.Lawall@...ia.fr> wrote:

> 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;
>  }
> 

Acked-by: Alex Williamson <alex.williamson@...hat.com>