migration: Rename ram_handle_compressed() to ram_handle_zero()

Now that we know it only handles zero, we can remove the ch parameter.

Reviewed-by: Fabiano Rosas <farosas@suse.de>
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231019085259.13307-3-quintela@redhat.com>

migration/ram.c

@@ -3446,7 +3446,7 @@ static inline void *colo_cache_from_block_offset(RAMBlock *block,
 }
 
 /**
- * ram_handle_compressed: handle the zero page case
+ * ram_handle_zero: handle the zero page case
  *
  * If a page (or a whole RDMA chunk) has been
  * determined to be zero, then zap it.
@@ -3455,10 +3455,10 @@ static inline void *colo_cache_from_block_offset(RAMBlock *block,
  * @ch: what the page is filled from.  We only support zero
  * @size: size of the zero page
  */
-void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
+void ram_handle_zero(void *host, uint64_t size)
 {
-    if (ch != 0 || !buffer_is_zero(host, size)) {
-        memset(host, ch, size);
+    if (!buffer_is_zero(host, size)) {
+        memset(host, 0, size);
     }
 }
 
@@ -4037,7 +4037,7 @@ static int ram_load_precopy(QEMUFile *f)
                 ret = -EINVAL;
                 break;
             }
-            ram_handle_compressed(host, ch, TARGET_PAGE_SIZE);
+            ram_handle_zero(host, TARGET_PAGE_SIZE);
             break;
 
         case RAM_SAVE_FLAG_PAGE:

migration/ram.h

@@ -60,7 +60,7 @@ int ram_discard_range(const char *block_name, uint64_t start, size_t length);
 int ram_postcopy_incoming_init(MigrationIncomingState *mis);
 int ram_load_postcopy(QEMUFile *f, int channel);
 
-void ram_handle_compressed(void *host, uint8_t ch, uint64_t size);
+void ram_handle_zero(void *host, uint64_t size);
 
 void ram_transferred_add(uint64_t bytes);
 void ram_release_page(const char *rbname, uint64_t offset);

migration/rdma.c

@@ -3597,7 +3597,7 @@ int rdma_registration_handle(QEMUFile *f)
                              comp->value);
                 goto err;
             }
-            ram_handle_compressed(host_addr, comp->value, comp->length);
+            ram_handle_zero(host_addr, comp->length);
             break;
 
         case RDMA_CONTROL_REGISTER_FINISHED: