[v2] iommu/iova: Optimize iova_magazine_alloc()
Commit Message
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>
---
drivers/iommu/iova.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
v1 --> v2:
Change sizeof(struct iova_magazine) to sizeof(*mag).
@@ -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)