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iommu/iova: Optimize iova_magazine_alloc()

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Only the member 'size' needs to be initialized to 0. Clearing the array
pfns[], which is about 1 KiB in size, not only wastes time, but also
causes cache pollution.

Acked-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Link: https://lore.kernel.org/r/20230421072422.869-1-thunder.leizhen@huawei.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Zhen Lei 2023-04-21 15:24:21 +08:00 committed by Joerg Roedel
parent 44c026a73b
commit 5d62bacc05
1 changed files with 7 additions and 1 deletions
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8
drivers/iommu/iova.c
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@ -647,7 +647,13 @@ struct iova_rcache {
static struct iova_magazine *iova_magazine_alloc(gfp_t flags)
{
return kzalloc(sizeof(struct iova_magazine), flags);
struct iova_magazine *mag;
mag = kmalloc(sizeof(*mag), flags);
if (mag)
mag->size = 0;
return mag;
}
static void iova_magazine_free(struct iova_magazine *mag)