[PATCH v1 02/29] virtio-mem: simplify calculation in virtio_mem_mb_state_prepare_next_mb()
From: David Hildenbrand <hidden>
Date: 2020-10-12 12:54:16
Also in:
linux-mm, lkml
Subsystem:
the rest, virtio core, virtio mem driver · Maintainers:
Linus Torvalds, "Michael S. Tsirkin", Jason Wang, David Hildenbrand
We actually need one byte less (next_mb_id is exclusive, first_mb_id is inclusive). Simplify. Cc: "Michael S. Tsirkin" <mst@redhat.com> Cc: Jason Wang <jasowang@redhat.com> Cc: Pankaj Gupta <pankaj.gupta.linux@gmail.com> Signed-off-by: David Hildenbrand <redacted> --- drivers/virtio/virtio_mem.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c
index a1f5bf7a571a..670b3faf412d 100644
--- a/drivers/virtio/virtio_mem.c
+++ b/drivers/virtio/virtio_mem.c@@ -257,8 +257,8 @@ static enum virtio_mem_mb_state virtio_mem_mb_get_state(struct virtio_mem *vm, */ static int virtio_mem_mb_state_prepare_next_mb(struct virtio_mem *vm) { - unsigned long old_bytes = vm->next_mb_id - vm->first_mb_id + 1; - unsigned long new_bytes = vm->next_mb_id - vm->first_mb_id + 2; + unsigned long old_bytes = vm->next_mb_id - vm->first_mb_id; + unsigned long new_bytes = old_bytes + 1; int old_pages = PFN_UP(old_bytes); int new_pages = PFN_UP(new_bytes); uint8_t *new_mb_state;
--
2.26.2
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