diff options
| author | David Hildenbrand <david@redhat.com> | 2020-11-12 16:37:48 +0300 |
|---|---|---|
| committer | Michael S. Tsirkin <mst@redhat.com> | 2020-12-19 00:14:25 +0300 |
| commit | 347202dc04a110bdab8d4e1c38ceccd7758fe13e (patch) | |
| tree | b300e385bf4a2816357584807af73bca66daf5ba /drivers/virtio | |
| parent | 6725f21157b4b6a9fe689cdf07b040d21ea536dd (diff) | |
| download | linux-347202dc04a110bdab8d4e1c38ceccd7758fe13e.tar.xz | |
virtio-mem: more precise calculation in virtio_mem_mb_state_prepare_next_mb()
We actually need one byte less (next_mb_id is exclusive, first_mb_id is
inclusive). While at it, compact the code.
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 <david@redhat.com>
Link: https://lore.kernel.org/r/20201112133815.13332-3-david@redhat.com
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'drivers/virtio')
| -rw-r--r-- | drivers/virtio/virtio_mem.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/drivers/virtio/virtio_mem.c b/drivers/virtio/virtio_mem.c index a37fd73588da..dee46865bae2 100644 --- a/drivers/virtio/virtio_mem.c +++ b/drivers/virtio/virtio_mem.c @@ -257,10 +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; - int old_pages = PFN_UP(old_bytes); - int new_pages = PFN_UP(new_bytes); + int old_pages = PFN_UP(vm->next_mb_id - vm->first_mb_id); + int new_pages = PFN_UP(vm->next_mb_id - vm->first_mb_id + 1); uint8_t *new_mb_state; if (vm->mb_state && old_pages == new_pages) |