hw: move fifo.[ch] to libqemuutil

fifo.c is generic code that can be easily unit tested.  So it
belongs in libqemuutil.
Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>

hw/Makefile.objs

@@ -44,7 +44,6 @@ common-obj-$(CONFIG_SMARTCARD_NSS) += ccid-card-emulated.o
 endif
 common-obj-$(CONFIG_I8259) += i8259_common.o i8259.o
 common-obj-$(CONFIG_SDHCI) += sdhci.o
-common-obj-y += fifo.o
 common-obj-y += pam.o
 
 # PPC devices

hw/xilinx_spi.c

@@ -27,7 +27,7 @@
 #include "sysbus.h"
 #include "sysemu/sysemu.h"
 #include "qemu/log.h"
-#include "fifo.h"
+#include "qemu/fifo8.h"
 
 #include "ssi.h"
 

hw/xilinx_spips.c

@@ -26,7 +26,7 @@
 #include "sysemu/sysemu.h"
 #include "ptimer.h"
 #include "qemu/log.h"
-#include "fifo.h"
+#include "qemu/fifo8.h"
 #include "ssi.h"
 #include "qemu/bitops.h"
 

include/migration/vmstate.h

@@ -26,6 +26,8 @@
 #ifndef QEMU_VMSTATE_H
 #define QEMU_VMSTATE_H 1
 
+#include <migration/qemu-file.h>
+
 typedef void SaveStateHandler(QEMUFile *f, void *opaque);
 typedef int LoadStateHandler(QEMUFile *f, void *opaque, int version_id);
 

hw/fifo.h → include/qemu/fifo8.h

 #ifndef FIFO_H
 #define FIFO_H
 
-#include "hw.h"
+#include "migration/vmstate.h"
 
 typedef struct {
     /* All fields are private */

util/Makefile.objs

@@ -3,6 +3,7 @@ util-obj-$(CONFIG_WIN32) += oslib-win32.o qemu-thread-win32.o event_notifier-win
 util-obj-$(CONFIG_POSIX) += oslib-posix.o qemu-thread-posix.o event_notifier-posix.o
 util-obj-y += envlist.o path.o host-utils.o cache-utils.o module.o
 util-obj-y += bitmap.o bitops.o hbitmap.o
+util-obj-y += fifo8.o
 util-obj-y += acl.o
 util-obj-y += error.o qemu-error.o
 util-obj-$(CONFIG_POSIX) += compatfd.o

hw/fifo.c → util/fifo8.c

@@ -12,7 +12,8 @@
  * with this program; if not, see <http://www.gnu.org/licenses/>.
  */
 
-#include "fifo.h"
+#include "qemu-common.h"
+#include "qemu/fifo8.h"
 
 void fifo8_create(Fifo8 *fifo, uint32_t capacity)
 {