Merge remote-tracking branch 'quintela/migration.next' into staging

# By Peter Lieven
# Via Juan Quintela
* quintela/migration.next:
  migration: drop MADVISE_DONT_NEED for incoming zero pages

Message-id: 1384878412-23521-1-git-send-email-quintela@redhat.com
Signed-off-by: NAnthony Liguori <aliguori@amazon.com>

arch_init.c

@@ -850,14 +850,6 @@ void ram_handle_compressed(void *host, uint8_t ch, uint64_t size)
 {
     if (ch != 0 || !is_zero_range(host, size)) {
         memset(host, ch, size);
-#ifndef _WIN32
-        if (ch == 0 && (!kvm_enabled() || kvm_has_sync_mmu())) {
-            size = size & ~(getpagesize() - 1);
-            if (size > 0) {
-                qemu_madvise(host, size, QEMU_MADV_DONTNEED);
-            }
-        }
-#endif
     }
 }