From: Wei Yang <richardw.yang@linux.intel.com>

RAMBlock->used_length is always passed to migration_bitmap_sync_range(),
which could be retrieved from RAMBlock.

Suggested-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Wei Yang <richardw.yang@linux.intel.com>
Message-Id: <20190718012547.16373-1-richardw.yang@linux.intel.com>
Reviewed-by: Peter Xu <peterx@redhat.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
---
 migration/ram.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/migration/ram.c b/migration/ram.c
index 255f289bbb..97f241d6d9 100644
--- a/migration/ram.c
+++ b/migration/ram.c
@@ -1748,11 +1748,10 @@ static inline bool migration_bitmap_clear_dirty(RAMState *rs,
 }
 
 /* Called with RCU critical section */
-static void migration_bitmap_sync_range(RAMState *rs, RAMBlock *rb,
-                                        ram_addr_t length)
+static void migration_bitmap_sync_range(RAMState *rs, RAMBlock *rb)
 {
     rs->migration_dirty_pages +=
-        cpu_physical_memory_sync_dirty_bitmap(rb, 0, length,
+        cpu_physical_memory_sync_dirty_bitmap(rb, 0, rb->used_length,
                                               &rs->num_dirty_pages_period);
 }
 
@@ -1841,7 +1840,7 @@ static void migration_bitmap_sync(RAMState *rs)
     qemu_mutex_lock(&rs->bitmap_mutex);
     rcu_read_lock();
     RAMBLOCK_FOREACH_NOT_IGNORED(block) {
-        migration_bitmap_sync_range(rs, block, block->used_length);
+        migration_bitmap_sync_range(rs, block);
     }
     ram_counters.remaining = ram_bytes_remaining();
     rcu_read_unlock();
@@ -4293,7 +4292,7 @@ static void colo_flush_ram_cache(void)
     memory_global_dirty_log_sync();
     rcu_read_lock();
     RAMBLOCK_FOREACH_NOT_IGNORED(block) {
-        migration_bitmap_sync_range(ram_state, block, block->used_length);
+        migration_bitmap_sync_range(ram_state, block);
     }
     rcu_read_unlock();
 
-- 
2.21.0