We actually need one byte less (next_mb_id is exclusive, first_mb_id is inclusive). Simplify.
Cc: "Michael S. Tsirkin" <[email protected]> Cc: Jason Wang <[email protected]> Cc: Pankaj Gupta <[email protected]> Signed-off-by: David Hildenbrand <[email protected]> --- 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
