migration: Make compress_data_with_multithreads return bool

Reviewed-by: Lukas Straub <lukasstraub2@web.de>
Reviewed-by: Fabiano Rosas <farosas@suse.de>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Message-ID: <20231019110724.15324-5-quintela@redhat.com>

migration/ram-compress.c

@@ -260,10 +260,13 @@ static inline void set_compress_params(CompressParam *param, RAMBlock *block,
     param->trigger = true;
 }
 
-int compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset,
-                                int (send_queued_data(CompressParam *)))
+/*
+ * Return true when it compress a page
+ */
+bool compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset,
+                                     int (send_queued_data(CompressParam *)))
 {
-    int  thread_count, pages = -1;
+    int thread_count;
     bool wait = migrate_compress_wait_thread();
 
     thread_count = migrate_compress_threads();
@@ -281,22 +284,22 @@ int compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset,
 
             qemu_cond_signal(&param->cond);
             qemu_mutex_unlock(&param->mutex);
-            pages = 1;
-            break;
+            qemu_mutex_unlock(&comp_done_lock);
+            return true;
         }
     }
 
     /*
      * wait for the free thread if the user specifies 'compress-wait-thread',
      * otherwise we will post the page out in the main thread as normal page.
      */
-    if (pages < 0 && wait) {
+    if (wait) {
         qemu_cond_wait(&comp_done_cond, &comp_done_lock);
         goto retry;
     }
     qemu_mutex_unlock(&comp_done_lock);
 
-    return pages;
+    return false;
 }
 
 /* return the size after decompression, or negative value on error */

migration/ram-compress.h

@@ -60,8 +60,8 @@ void compress_threads_save_cleanup(void);
 int compress_threads_save_setup(void);
 
 void flush_compressed_data(int (send_queued_data(CompressParam *)));
-int compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset,
-                                int (send_queued_data(CompressParam *)));
+bool compress_page_with_multi_thread(RAMBlock *block, ram_addr_t offset,
+                                      int (send_queued_data(CompressParam *)));
 
 int wait_for_decompress_done(void);
 void compress_threads_load_cleanup(void);

migration/ram.c

@@ -2067,8 +2067,7 @@ static bool save_compress_page(RAMState *rs, PageSearchStatus *pss,
         return false;
     }
 
-    if (compress_page_with_multi_thread(pss->block, offset,
-                                        send_queued_data) > 0) {
+    if (compress_page_with_multi_thread(pss->block, offset, send_queued_data)) {
         return true;
     }