migration: Simplify alignment and alignment checks

Let's use QEMU_ALIGN_DOWN() and friends to make the code a bit easier to
read.

Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/migration/ram.c b/migration/ram.c
index 4f629de7d0..54df5dc0fc 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -811,7 +811,7 @@ static void migration_clear_memory_region_dirty_bitmap(RAMBlock *rb,
     assert(shift >= 6);
 
     size = 1ULL << (TARGET_PAGE_BITS + shift);
-    start = (((ram_addr_t)page) << TARGET_PAGE_BITS) & (-size);
+    start = QEMU_ALIGN_DOWN((ram_addr_t)page << TARGET_PAGE_BITS, size);
     trace_migration_bitmap_clear_dirty(rb->idstr, start, size, page);
     memory_region_clear_dirty_bitmap(rb->mr, start, size);
 }