exec: Rename qemu_ram_writeback() as qemu_ram_msync()

Rename qemu_ram_writeback() as qemu_ram_msync() to better
match what it does.

Suggested-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Acked-by: Paolo Bonzini <pbonzini@redhat.com>
Message-id: 20200508062456.23344-5-philmd@redhat.com
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

exec.c

@@ -2127,7 +2127,7 @@ int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp)
  * Otherwise no-op.
  * @Note: this is supposed to be a synchronous op.
  */
-void qemu_ram_writeback(RAMBlock *block, ram_addr_t start, ram_addr_t length)
+void qemu_ram_msync(RAMBlock *block, ram_addr_t start, ram_addr_t length)
 {
     /* The requested range should fit in within the block range */
     g_assert((start + length) <= block->used_length);

include/exec/ram_addr.h

@@ -136,12 +136,12 @@ void qemu_ram_free(RAMBlock *block);
 
 int qemu_ram_resize(RAMBlock *block, ram_addr_t newsize, Error **errp);
 
-void qemu_ram_writeback(RAMBlock *block, ram_addr_t start, ram_addr_t length);
+void qemu_ram_msync(RAMBlock *block, ram_addr_t start, ram_addr_t length);
 
 /* Clear whole block of mem */
 static inline void qemu_ram_block_writeback(RAMBlock *block)
 {
-    qemu_ram_writeback(block, 0, block->used_length);
+    qemu_ram_msync(block, 0, block->used_length);
 }
 
 #define DIRTY_CLIENTS_ALL     ((1 << DIRTY_MEMORY_NUM) - 1)

memory.c

@@ -2200,7 +2200,7 @@ void memory_region_ram_resize(MemoryRegion *mr, ram_addr_t newsize, Error **errp
 void memory_region_msync(MemoryRegion *mr, hwaddr addr, hwaddr size)
 {
     if (mr->ram_block) {
-        qemu_ram_writeback(mr->ram_block, addr, size);
+        qemu_ram_msync(mr->ram_block, addr, size);
     }
 }