Re: [PATCH v2 1/2] iova: Remove some magazine pointer NULL checks

Jerry Snitselaar
2022-09-05T15:06:17Z

On Mon, Sep 05, 2022 at 05:11:22PM +0800, John Garry wrote:
> Since commit 32e92d9f6f87 ("iommu/iova: Separate out rcache init") it
> has not been possible to have NULL CPU rcache "loaded" or "prev" magazine
> pointers. As such, the checks in iova_magazine_full(),
> iova_magazine_empty(), and iova_magazine_free_pfns() may be dropped.
>
> Signed-off-by: John Garry <john.garry@huawei.com>
> Reviewed-by: Robin Murphy <robin.murphy@arm.com>

Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com

> ---
> drivers/iommu/iova.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/iommu/iova.c b/drivers/iommu/iova.c
> index 47d1983dfa2a..580fdf669922 100644
> --- a/drivers/iommu/iova.c
> +++ b/drivers/iommu/iova.c
> @@ -661,9 +661,6 @@ iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
> unsigned long flags;
> int i;
>
> - if (!mag)
> - return;
> -
> spin_lock_irqsave(&iovad->iova_rbtree_lock, flags);
>
> for (i = 0 ; i < mag->size; ++i) {
> @@ -683,12 +680,12 @@ iova_magazine_free_pfns(struct iova_magazine *mag, struct iova_domain *iovad)
>
> static bool iova_magazine_full(struct iova_magazine *mag)
> {
> - return (mag && mag->size == IOVA_MAG_SIZE);
> + return mag->size == IOVA_MAG_SIZE;
> }
>
> static bool iova_magazine_empty(struct iova_magazine *mag)
> {
> - return (!mag || mag->size == 0);
> + return mag->size == 0;
> }
>
> static unsigned long iova_magazine_pop(struct iova_magazine *mag,
> --
> 2.35.3
>