diff --git a/block/qed-table.c b/block/qed-table.c
index ce07b05549..de845ec3d0 100644
--- a/block/qed-table.c
+++ b/block/qed-table.c
@@ -103,7 +103,6 @@ static void qed_write_table_cb(void *opaque, int ret)
 out:
     qemu_vfree(write_table_cb->table);
     gencb_complete(&write_table_cb->gencb, ret);
-    return;
 }
 
 /**
diff --git a/blockdev.c b/blockdev.c
index 5f18dfa97b..99828ad2bd 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -830,7 +830,6 @@ exit:
     QSIMPLEQ_FOREACH_SAFE(states, &snap_bdrv_states, entry, next) {
         g_free(states);
     }
-    return;
 }
 
 
diff --git a/configure b/configure
index 73a5f3dc7c..c4a78376b6 100755
--- a/configure
+++ b/configure
@@ -125,7 +125,8 @@ cc_i386=i386-pc-linux-gnu-gcc
 libs_qga=""
 debug_info="yes"
 
-target_list=""
+# Don't accept a target_list environment variable.
+unset target_list
 
 # Default value for a variable defining feature "foo".
 #  * foo="no"  feature will only be used if --enable-foo arg is given
@@ -1288,7 +1289,7 @@ if ! "$python" -c 'import sys; sys.exit(sys.version_info < (2,4) or sys.version_
   exit 1
 fi
 
-if test -z "$target_list" ; then
+if test -z "${target_list+xxx}" ; then
     target_list="$default_target_list"
 else
     target_list=`echo "$target_list" | sed -e 's/,/ /g'`
diff --git a/cpus.c b/cpus.c
index 4b726ef4e7..1d5d4904cc 100644
--- a/cpus.c
+++ b/cpus.c
@@ -613,7 +613,7 @@ static void qemu_tcg_init_cpu_signals(void)
 }
 #endif /* _WIN32 */
 
-QemuMutex qemu_global_mutex;
+static QemuMutex qemu_global_mutex;
 static QemuCond qemu_io_proceeded_cond;
 static bool iothread_requesting_mutex;
 
diff --git a/hw/9pfs/virtio-9p.c b/hw/9pfs/virtio-9p.c
index 4b52540116..8b9cdc96ed 100644
--- a/hw/9pfs/virtio-9p.c
+++ b/hw/9pfs/virtio-9p.c
@@ -505,7 +505,6 @@ static void virtfs_reset(V9fsPDU *pdu)
         error_report("9pfs:%s: One or more uncluncked fids "
                      "found during reset", __func__);
     }
-    return;
 }
 
 #define P9_QID_TYPE_DIR         0x80
@@ -934,7 +933,6 @@ static void v9fs_version(void *opaque)
 out:
     complete_pdu(s, pdu, offset);
     v9fs_string_free(&version);
-    return;
 }
 
 static void v9fs_attach(void *opaque)
@@ -1314,7 +1312,6 @@ out_nofid:
         g_free(wnames);
         g_free(qids);
     }
-    return;
 }
 
 static int32_t get_iounit(V9fsPDU *pdu, V9fsPath *path)
@@ -2257,7 +2254,6 @@ static void v9fs_flush(void *opaque)
         free_pdu(pdu->s, cancel_pdu);
     }
     complete_pdu(s, pdu, 7);
-    return;
 }
 
 static void v9fs_link(void *opaque)
@@ -2763,7 +2759,6 @@ out:
     put_fid(pdu, fidp);
 out_nofid:
     complete_pdu(s, pdu, retval);
-    return;
 }
 
 static void v9fs_mknod(void *opaque)
diff --git a/hw/blizzard.c b/hw/blizzard.c
index d1c9d81510..06e19b364b 100644
--- a/hw/blizzard.c
+++ b/hw/blizzard.c
@@ -878,8 +878,6 @@ void s1d13745_write_block(void *opaque, int dc,
         len -= 2;
         buf += 2;
     }
-
-    return;
 }
 
 static void blizzard_update_display(void *opaque)
diff --git a/hw/bt-hci.c b/hw/bt-hci.c
index 47f9a4e496..e54cfd7815 100644
--- a/hw/bt-hci.c
+++ b/hw/bt-hci.c
@@ -786,7 +786,6 @@ static void bt_hci_lmp_connection_request(struct bt_link_s *link)
     memcpy(&params.dev_class, &link->host->class, sizeof(params.dev_class));
     params.link_type	= ACL_LINK;
     bt_hci_event(hci, EVT_CONN_REQUEST, &params, EVT_CONN_REQUEST_SIZE);
-    return;
 }
 
 static void bt_hci_conn_accept_timeout(void *opaque)
diff --git a/hw/device-hotplug.c b/hw/device-hotplug.c
index 2bdc615b49..eec0fe3148 100644
--- a/hw/device-hotplug.c
+++ b/hw/device-hotplug.c
@@ -89,5 +89,4 @@ err:
     if (dinfo) {
         drive_put_ref(dinfo);
     }
-    return;
 }
diff --git a/hw/exynos4210_combiner.c b/hw/exynos4210_combiner.c
index 80af22cc33..60b33c7886 100644
--- a/hw/exynos4210_combiner.c
+++ b/hw/exynos4210_combiner.c
@@ -347,8 +347,6 @@ static void exynos4210_combiner_write(void *opaque, target_phys_addr_t offset,
                 TARGET_FMT_plx "\n", offset);
         break;
     }
-
-    return;
 }
 
 /* Get combiner group and bit from irq number */
@@ -380,8 +378,6 @@ static void exynos4210_combiner_handler(void *opaque, int irq, int level)
     }
 
     exynos4210_combiner_update(s, group_n);
-
-    return;
 }
 
 static void exynos4210_combiner_reset(DeviceState *d)
diff --git a/hw/exynos4210_gic.c b/hw/exynos4210_gic.c
index 7d03dd9ae3..4fea09873a 100644
--- a/hw/exynos4210_gic.c
+++ b/hw/exynos4210_gic.c
@@ -193,8 +193,6 @@ static void exynos4210_irq_handler(void *opaque, int irq, int level)
 
     /* Bypass */
     qemu_set_irq(s->board_irqs[irq], level);
-
-    return;
 }
 
 /*
@@ -410,8 +408,6 @@ static void exynos4210_irq_gate_handler(void *opaque, int irq, int level)
     }
 
     qemu_irq_lower(s->out);
-
-    return;
 }
 
 static void exynos4210_irq_gate_reset(DeviceState *d)
diff --git a/hw/exynos4210_mct.c b/hw/exynos4210_mct.c
index 7a22b1f900..6f94ce230c 100644
--- a/hw/exynos4210_mct.c
+++ b/hw/exynos4210_mct.c
@@ -574,8 +574,6 @@ static void exynos4210_gfrc_event(void *opaque)
     exynos4210_gfrc_set_count(&s->g_timer, distance);
 
     exynos4210_gfrc_start(&s->g_timer);
-
-    return;
 }
 
 /*
diff --git a/hw/fdc.c b/hw/fdc.c
index 43b0f20503..25a49e350c 100644
--- a/hw/fdc.c
+++ b/hw/fdc.c
@@ -1286,8 +1286,6 @@ static void fdctrl_start_transfer(FDCtrl *fdctrl, int direction)
         fdctrl->msr |= FD_MSR_DIO;
     /* IO based transfer: calculate len */
     fdctrl_raise_irq(fdctrl, FD_SR0_SEEK);
-
-    return;
 }
 
 /* Prepare a transfer of deleted data */
diff --git a/hw/framebuffer.c b/hw/framebuffer.c
index 85a00a5798..27fa6f51fb 100644
--- a/hw/framebuffer.c
+++ b/hw/framebuffer.c
@@ -107,5 +107,4 @@ void framebuffer_update_display(
                               DIRTY_MEMORY_VGA);
     *first_row = first;
     *last_row = last;
-    return;
 }
diff --git a/hw/ide/macio.c b/hw/ide/macio.c
index 848cb31429..f228725142 100644
--- a/hw/ide/macio.c
+++ b/hw/ide/macio.c
@@ -89,7 +89,6 @@ static void pmac_ide_atapi_transfer_cb(void *opaque, int ret)
 done:
     bdrv_acct_done(s->bs, &s->acct);
     io->dma_end(opaque);
-    return;
 }
 
 static void pmac_ide_transfer_cb(void *opaque, int ret)
diff --git a/hw/ivshmem.c b/hw/ivshmem.c
index 59f1aa4265..5c4ccb85f0 100644
--- a/hw/ivshmem.c
+++ b/hw/ivshmem.c
@@ -149,7 +149,6 @@ static void ivshmem_IntrStatus_write(IVShmemState *s, uint32_t val)
     s->intrstatus = val;
 
     ivshmem_update_irq(s, val);
-    return;
 }
 
 static uint32_t ivshmem_IntrStatus_read(IVShmemState *s)
@@ -510,8 +509,6 @@ static void ivshmem_read(void *opaque, const uint8_t * buf, int flags)
     if (ivshmem_has_feature(s, IVSHMEM_IOEVENTFD)) {
         ivshmem_add_eventfd(s, incoming_posn, guest_max_eventfd);
     }
-
-    return;
 }
 
 /* Select the MSI-X vectors used by device.
@@ -536,7 +533,6 @@ static void ivshmem_reset(DeviceState *d)
 
     s->intrstatus = 0;
     ivshmem_use_msix(s);
-    return;
 }
 
 static uint64_t ivshmem_get_size(IVShmemState * s) {
diff --git a/hw/leon3.c b/hw/leon3.c
index 878d3aa557..7a9729dc28 100644
--- a/hw/leon3.c
+++ b/hw/leon3.c
@@ -210,7 +210,7 @@ static void leon3_generic_hw_init(ram_addr_t  ram_size,
     }
 }
 
-QEMUMachine leon3_generic_machine = {
+static QEMUMachine leon3_generic_machine = {
     .name     = "leon3_generic",
     .desc     = "Leon-3 generic",
     .init     = leon3_generic_hw_init,
diff --git a/hw/megasas.c b/hw/megasas.c
index c728aea699..0e57740fd2 100644
--- a/hw/megasas.c
+++ b/hw/megasas.c
@@ -652,7 +652,6 @@ static void megasas_finish_dcmd(MegasasCmd *cmd, uint32_t iov_size)
         }
     }
     cmd->iov_size = 0;
-    return;
 }
 
 static int megasas_ctrl_get_info(MegasasState *s, MegasasCmd *cmd)
diff --git a/hw/mips_fulong2e.c b/hw/mips_fulong2e.c
index 38e4b86150..d4a8672f23 100644
--- a/hw/mips_fulong2e.c
+++ b/hw/mips_fulong2e.c
@@ -392,7 +392,7 @@ static void mips_fulong2e_init(ram_addr_t ram_size, const char *boot_device,
     network_init();
 }
 
-QEMUMachine mips_fulong2e_machine = {
+static QEMUMachine mips_fulong2e_machine = {
     .name = "fulong2e",
     .desc = "Fulong 2e mini pc",
     .init = mips_fulong2e_init,
diff --git a/hw/msix.c b/hw/msix.c
index d812094139..b623cb597c 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -366,7 +366,6 @@ void msix_uninit(PCIDevice *dev, MemoryRegion *table_bar, MemoryRegion *pba_bar)
     g_free(dev->msix_entry_used);
     dev->msix_entry_used = NULL;
     dev->cap_present &= ~QEMU_PCI_CAP_MSIX;
-    return;
 }
 
 void msix_uninit_exclusive_bar(PCIDevice *dev)
diff --git a/hw/nand.c b/hw/nand.c
index e9501ae038..01f3adaee1 100644
--- a/hw/nand.c
+++ b/hw/nand.c
@@ -654,7 +654,7 @@ static void glue(nand_blk_write_, PAGE_SIZE)(NANDFlashState *s)
         sector = SECTOR(s->addr);
         off = (s->addr & PAGE_MASK) + s->offset;
         soff = SECTOR_OFFSET(s->addr);
-        if (bdrv_read(s->bdrv, sector, iobuf, PAGE_SECTORS) == -1) {
+        if (bdrv_read(s->bdrv, sector, iobuf, PAGE_SECTORS) < 0) {
             printf("%s: read error in sector %" PRIu64 "\n", __func__, sector);
             return;
         }
@@ -666,21 +666,23 @@ static void glue(nand_blk_write_, PAGE_SIZE)(NANDFlashState *s)
                             MIN(OOB_SIZE, off + s->iolen - PAGE_SIZE));
         }
 
-        if (bdrv_write(s->bdrv, sector, iobuf, PAGE_SECTORS) == -1)
+        if (bdrv_write(s->bdrv, sector, iobuf, PAGE_SECTORS) < 0) {
             printf("%s: write error in sector %" PRIu64 "\n", __func__, sector);
+        }
     } else {
         off = PAGE_START(s->addr) + (s->addr & PAGE_MASK) + s->offset;
         sector = off >> 9;
         soff = off & 0x1ff;
-        if (bdrv_read(s->bdrv, sector, iobuf, PAGE_SECTORS + 2) == -1) {
+        if (bdrv_read(s->bdrv, sector, iobuf, PAGE_SECTORS + 2) < 0) {
             printf("%s: read error in sector %" PRIu64 "\n", __func__, sector);
             return;
         }
 
         mem_and(iobuf + soff, s->io, s->iolen);
 
-        if (bdrv_write(s->bdrv, sector, iobuf, PAGE_SECTORS + 2) == -1)
+        if (bdrv_write(s->bdrv, sector, iobuf, PAGE_SECTORS + 2) < 0) {
             printf("%s: write error in sector %" PRIu64 "\n", __func__, sector);
+        }
     }
     s->offset = 0;
 }
@@ -704,31 +706,37 @@ static void glue(nand_blk_erase_, PAGE_SIZE)(NANDFlashState *s)
         i = SECTOR(addr);
         page = SECTOR(addr + (ADDR_SHIFT + s->erase_shift));
         for (; i < page; i ++)
-            if (bdrv_write(s->bdrv, i, iobuf, 1) == -1)
+            if (bdrv_write(s->bdrv, i, iobuf, 1) < 0) {
                 printf("%s: write error in sector %" PRIu64 "\n", __func__, i);
+            }
     } else {
         addr = PAGE_START(addr);
         page = addr >> 9;
-        if (bdrv_read(s->bdrv, page, iobuf, 1) == -1)
+        if (bdrv_read(s->bdrv, page, iobuf, 1) < 0) {
             printf("%s: read error in sector %" PRIu64 "\n", __func__, page);
+        }
         memset(iobuf + (addr & 0x1ff), 0xff, (~addr & 0x1ff) + 1);
-        if (bdrv_write(s->bdrv, page, iobuf, 1) == -1)
+        if (bdrv_write(s->bdrv, page, iobuf, 1) < 0) {
             printf("%s: write error in sector %" PRIu64 "\n", __func__, page);
+        }
 
         memset(iobuf, 0xff, 0x200);
         i = (addr & ~0x1ff) + 0x200;
         for (addr += ((PAGE_SIZE + OOB_SIZE) << s->erase_shift) - 0x200;
                         i < addr; i += 0x200)
-            if (bdrv_write(s->bdrv, i >> 9, iobuf, 1) == -1)
+            if (bdrv_write(s->bdrv, i >> 9, iobuf, 1) < 0) {
                 printf("%s: write error in sector %" PRIu64 "\n",
                        __func__, i >> 9);
+            }
 
         page = i >> 9;
-        if (bdrv_read(s->bdrv, page, iobuf, 1) == -1)
+        if (bdrv_read(s->bdrv, page, iobuf, 1) < 0) {
             printf("%s: read error in sector %" PRIu64 "\n", __func__, page);
+        }
         memset(iobuf, 0xff, ((addr - 1) & 0x1ff) + 1);
-        if (bdrv_write(s->bdrv, page, iobuf, 1) == -1)
+        if (bdrv_write(s->bdrv, page, iobuf, 1) < 0) {
             printf("%s: write error in sector %" PRIu64 "\n", __func__, page);
+        }
     }
 }
 
@@ -740,18 +748,20 @@ static void glue(nand_blk_load_, PAGE_SIZE)(NANDFlashState *s,
 
     if (s->bdrv) {
         if (s->mem_oob) {
-            if (bdrv_read(s->bdrv, SECTOR(addr), s->io, PAGE_SECTORS) == -1)
+            if (bdrv_read(s->bdrv, SECTOR(addr), s->io, PAGE_SECTORS) < 0) {
                 printf("%s: read error in sector %" PRIu64 "\n",
                                 __func__, SECTOR(addr));
+            }
             memcpy(s->io + SECTOR_OFFSET(s->addr) + PAGE_SIZE,
                             s->storage + (PAGE(s->addr) << OOB_SHIFT),
                             OOB_SIZE);
             s->ioaddr = s->io + SECTOR_OFFSET(s->addr) + offset;
         } else {
             if (bdrv_read(s->bdrv, PAGE_START(addr) >> 9,
-                                    s->io, (PAGE_SECTORS + 2)) == -1)
+                                    s->io, (PAGE_SECTORS + 2)) < 0) {
                 printf("%s: read error in sector %" PRIu64 "\n",
                                 __func__, PAGE_START(addr) >> 9);
+            }
             s->ioaddr = s->io + (PAGE_START(addr) & 0x1ff) + offset;
         }
     } else {
diff --git a/hw/onenand.c b/hw/onenand.c
index db6af682c4..0f7b755a6d 100644
--- a/hw/onenand.c
+++ b/hw/onenand.c
@@ -351,7 +351,7 @@ static inline int onenand_erase(OneNANDState *s, int sec, int num)
     for (; num > 0; num--, sec++) {
         if (s->bdrv_cur) {
             int erasesec = s->secs_cur + (sec >> 5);
-            if (bdrv_write(s->bdrv_cur, sec, blankbuf, 1)) {
+            if (bdrv_write(s->bdrv_cur, sec, blankbuf, 1) < 0) {
                 goto fail;
             }
             if (bdrv_read(s->bdrv_cur, erasesec, tmpbuf, 1) < 0) {
diff --git a/hw/pflash_cfi01.c b/hw/pflash_cfi01.c
index 855890d1f1..3b437da9c3 100644
--- a/hw/pflash_cfi01.c
+++ b/hw/pflash_cfi01.c
@@ -442,7 +442,6 @@ static void pflash_write(pflash_t *pfl, target_phys_addr_t offset,
     pfl->bypass = 0;
     pfl->wcycle = 0;
     pfl->cmd = 0;
-    return;
 }
 
 
diff --git a/hw/pflash_cfi02.c b/hw/pflash_cfi02.c
index 8cb1549587..39337ec304 100644
--- a/hw/pflash_cfi02.c
+++ b/hw/pflash_cfi02.c
@@ -474,7 +474,6 @@ static void pflash_write (pflash_t *pfl, target_phys_addr_t offset,
  do_bypass:
     pfl->wcycle = 2;
     pfl->cmd = 0;
-    return;
 }
 
 
diff --git a/hw/pxa2xx_keypad.c b/hw/pxa2xx_keypad.c
index 59db02584e..1a997c9c83 100644
--- a/hw/pxa2xx_keypad.c
+++ b/hw/pxa2xx_keypad.c
@@ -172,7 +172,6 @@ static void pxa27x_keyboard_event (PXA2xxKeyPadState *kp, int keycode)
         kp->kpc |= KPC_MI;
         qemu_irq_raise(kp->irq);
     }
-    return;
 }
 
 static uint64_t pxa2xx_keypad_read(void *opaque, target_phys_addr_t offset,
diff --git a/hw/qdev.c b/hw/qdev.c
index adfc4a7ea3..b6e9207ede 100644
--- a/hw/qdev.c
+++ b/hw/qdev.c
@@ -34,7 +34,6 @@ int qdev_hotplug = 0;
 static bool qdev_hot_added = false;
 static bool qdev_hot_removed = false;
 
-/* Register a new device type.  */
 const VMStateDescription *qdev_get_vmsd(DeviceState *dev)
 {
     DeviceClass *dc = DEVICE_GET_CLASS(dev);
diff --git a/hw/sb16.c b/hw/sb16.c
index c81455d7f3..523ab0d5fd 100644
--- a/hw/sb16.c
+++ b/hw/sb16.c
@@ -822,7 +822,6 @@ static void complete (SB16State *s)
 
     ldebug ("\n");
     s->cmd = -1;
-    return;
 }
 
 static void legacy_reset (SB16State *s)
diff --git a/hw/scsi-disk.c b/hw/scsi-disk.c
index 99bb02ebf8..1b0afa6352 100644
--- a/hw/scsi-disk.c
+++ b/hw/scsi-disk.c
@@ -1437,7 +1437,6 @@ invalid_param_len:
 
 invalid_field:
     scsi_check_condition(r, SENSE_CODE(INVALID_FIELD));
-    return;
 }
 
 static inline bool check_lba_range(SCSIDiskState *s,
@@ -1535,7 +1534,6 @@ static void scsi_disk_emulate_unmap(SCSIDiskReq *r, uint8_t *inbuf)
 
 invalid_param_len:
     scsi_check_condition(r, SENSE_CODE(INVALID_PARAM_LEN));
-    return;
 }
 
 static void scsi_disk_emulate_write_data(SCSIRequest *req)
diff --git a/hw/sd.c b/hw/sd.c
index ec26407543..297580aabe 100644
--- a/hw/sd.c
+++ b/hw/sd.c
@@ -1407,7 +1407,7 @@ static void sd_blk_read(SDState *sd, uint64_t addr, uint32_t len)
 
     DPRINTF("sd_blk_read: addr = 0x%08llx, len = %d\n",
             (unsigned long long) addr, len);
-    if (!sd->bdrv || bdrv_read(sd->bdrv, addr >> 9, sd->buf, 1) == -1) {
+    if (!sd->bdrv || bdrv_read(sd->bdrv, addr >> 9, sd->buf, 1) < 0) {
         fprintf(stderr, "sd_blk_read: read error on host side\n");
         return;
     }
@@ -1415,7 +1415,7 @@ static void sd_blk_read(SDState *sd, uint64_t addr, uint32_t len)
     if (end > (addr & ~511) + 512) {
         memcpy(sd->data, sd->buf + (addr & 511), 512 - (addr & 511));
 
-        if (bdrv_read(sd->bdrv, end >> 9, sd->buf, 1) == -1) {
+        if (bdrv_read(sd->bdrv, end >> 9, sd->buf, 1) < 0) {
             fprintf(stderr, "sd_blk_read: read error on host side\n");
             return;
         }
@@ -1429,29 +1429,31 @@ static void sd_blk_write(SDState *sd, uint64_t addr, uint32_t len)
     uint64_t end = addr + len;
 
     if ((addr & 511) || len < 512)
-        if (!sd->bdrv || bdrv_read(sd->bdrv, addr >> 9, sd->buf, 1) == -1) {
+        if (!sd->bdrv || bdrv_read(sd->bdrv, addr >> 9, sd->buf, 1) < 0) {
             fprintf(stderr, "sd_blk_write: read error on host side\n");
             return;
         }
 
     if (end > (addr & ~511) + 512) {
         memcpy(sd->buf + (addr & 511), sd->data, 512 - (addr & 511));
-        if (bdrv_write(sd->bdrv, addr >> 9, sd->buf, 1) == -1) {
+        if (bdrv_write(sd->bdrv, addr >> 9, sd->buf, 1) < 0) {
             fprintf(stderr, "sd_blk_write: write error on host side\n");
             return;
         }
 
-        if (bdrv_read(sd->bdrv, end >> 9, sd->buf, 1) == -1) {
+        if (bdrv_read(sd->bdrv, end >> 9, sd->buf, 1) < 0) {
             fprintf(stderr, "sd_blk_write: read error on host side\n");
             return;
         }
         memcpy(sd->buf, sd->data + 512 - (addr & 511), end & 511);
-        if (bdrv_write(sd->bdrv, end >> 9, sd->buf, 1) == -1)
+        if (bdrv_write(sd->bdrv, end >> 9, sd->buf, 1) < 0) {
             fprintf(stderr, "sd_blk_write: write error on host side\n");
+        }
     } else {
         memcpy(sd->buf + (addr & 511), sd->data, len);
-        if (!sd->bdrv || bdrv_write(sd->bdrv, addr >> 9, sd->buf, 1) == -1)
+        if (!sd->bdrv || bdrv_write(sd->bdrv, addr >> 9, sd->buf, 1) < 0) {
             fprintf(stderr, "sd_blk_write: write error on host side\n");
+        }
     }
 }
 
diff --git a/hw/tcx.c b/hw/tcx.c
index 93994d6440..2db2db1235 100644
--- a/hw/tcx.c
+++ b/hw/tcx.c
@@ -472,7 +472,6 @@ static void tcx_dac_writel(void *opaque, target_phys_addr_t addr, uint64_t val,
     default:
         break;
     }
-    return;
 }
 
 static const MemoryRegionOps tcx_dac_ops = {
diff --git a/hw/usb/dev-uas.c b/hw/usb/dev-uas.c
index 5a0057a36b..4389380e95 100644
--- a/hw/usb/dev-uas.c
+++ b/hw/usb/dev-uas.c
@@ -576,7 +576,6 @@ bad_target:
      */
     usb_uas_queue_response(uas, req->tag, UAS_RC_INVALID_INFO_UNIT, 0);
     g_free(req);
-    return;
 }
 
 static void usb_uas_task(UASDevice *uas, uas_ui *ui)
@@ -640,7 +639,6 @@ bad_target:
 
 incorrect_lun:
     usb_uas_queue_response(uas, tag, UAS_RC_INCORRECT_LUN, 0);
-    return;
 }
 
 static int usb_uas_handle_data(USBDevice *dev, USBPacket *p)
diff --git a/hw/usb/hcd-ohci.c b/hw/usb/hcd-ohci.c
index c36184ae4f..59c7055cb5 100644
--- a/hw/usb/hcd-ohci.c
+++ b/hw/usb/hcd-ohci.c
@@ -1470,8 +1470,6 @@ static void ohci_port_set_status(OHCIState *ohci, int portnum, uint32_t val)
 
     if (old_state != port->ctrl)
         ohci_set_interrupt(ohci, OHCI_INTR_RHSC);
-
-    return;
 }
 
 static uint64_t ohci_mem_read(void *opaque,
diff --git a/hw/usb/hcd-xhci.c b/hw/usb/hcd-xhci.c
index e79a8724c5..3a41b067c4 100644
--- a/hw/usb/hcd-xhci.c
+++ b/hw/usb/hcd-xhci.c
@@ -807,7 +807,6 @@ static void xhci_events_update(XHCIState *xhci, int v)
         DPRINTF("xhci_events_update(): event ring no longer full\n");
         intr->er_full = 0;
     }
-    return;
 }
 
 static void xhci_event(XHCIState *xhci, XHCIEvent *event, int v)
diff --git a/hw/versatilepb.c b/hw/versatilepb.c
index 7a92034718..b3f8077146 100644
--- a/hw/versatilepb.c
+++ b/hw/versatilepb.c
@@ -211,7 +211,8 @@ static void versatile_init(ram_addr_t ram_size,
 
     cpu_pic = arm_pic_init_cpu(cpu);
     dev = sysbus_create_varargs("pl190", 0x10140000,
-                                cpu_pic[0], cpu_pic[1], NULL);
+                                cpu_pic[ARM_PIC_CPU_IRQ],
+                                cpu_pic[ARM_PIC_CPU_FIQ], NULL);
     for (n = 0; n < 32; n++) {
         pic[n] = qdev_get_gpio_in(dev, n);
     }
diff --git a/hw/xen_domainbuild.c b/hw/xen_domainbuild.c
index a6a12e5930..db1497469a 100644
--- a/hw/xen_domainbuild.c
+++ b/hw/xen_domainbuild.c
@@ -153,7 +153,6 @@ static void xen_domain_poll(void *opaque)
 
 quit:
     qemu_system_shutdown_request();
-    return;
 }
 
 static int xen_domain_watcher(void)
diff --git a/libcacard/vcard.c b/libcacard/vcard.c
index b02556ee0c..539177bb4c 100644
--- a/libcacard/vcard.c
+++ b/libcacard/vcard.c
@@ -200,7 +200,6 @@ vcard_free(VCard *vcard)
     }
     vcard_buffer_response_delete(vcard->vcard_buffer_response);
     g_free(vcard);
-    return;
 }
 
 void
diff --git a/libcacard/vcard_emul_nss.c b/libcacard/vcard_emul_nss.c
index e1cae5bc51..5f565e0b4a 100644
--- a/libcacard/vcard_emul_nss.c
+++ b/libcacard/vcard_emul_nss.c
@@ -168,7 +168,6 @@ vcard_emul_delete_key(VCardKey *key)
     if (key->slot) {
         PK11_FreeSlot(key->slot);
     }
-    return;
 }
 
 /*
@@ -418,7 +417,6 @@ vcard_emul_reset(VCard *card, VCardPower power)
     /* TODO: we may also need to send insertion/removal events? */
     slot = vcard_emul_card_get_slot(card);
     PK11_Logout(slot); /* NOTE: ignoring SECStatus return value */
-    return;
 }
 
 
@@ -535,7 +533,6 @@ vcard_emul_get_atr(VCard *card, unsigned char *atr, int *atr_len)
 
     memcpy(atr, nss_atr, len);
     *atr_len = len;
-    return;
 }
 
 /*
diff --git a/libcacard/vreader.c b/libcacard/vreader.c
index ec126dfa46..96d2407e78 100644
--- a/libcacard/vreader.c
+++ b/libcacard/vreader.c
@@ -93,7 +93,6 @@ vreader_free(VReader *reader)
         reader->reader_private_free(reader->reader_private);
     }
     g_free(reader);
-    return;
 }
 
 static VCard *
diff --git a/linux-user/signal.c b/linux-user/signal.c
index 78691473fa..15bc4e8f62 100644
--- a/linux-user/signal.c
+++ b/linux-user/signal.c
@@ -2762,7 +2762,6 @@ static void setup_frame(int sig, struct target_sigaction * ka,
 give_sigsegv:
     unlock_user_struct(frame, frame_addr, 1);
     force_sig(TARGET_SIGSEGV/*, current*/);
-    return;
 }
 
 long do_sigreturn(CPUMIPSState *regs)
@@ -2871,7 +2870,6 @@ static void setup_rt_frame(int sig, struct target_sigaction *ka,
 give_sigsegv:
     unlock_user_struct(frame, frame_addr, 1);
     force_sig(TARGET_SIGSEGV/*, current*/);
-    return;
 }
 
 long do_rt_sigreturn(CPUMIPSState *env)
diff --git a/os-posix.c b/os-posix.c
index f855abb09a..488e48005f 100644
--- a/os-posix.c
+++ b/os-posix.c
@@ -193,7 +193,6 @@ void os_parse_cmd_args(int index, const char *optarg)
         break;
 #endif
     }
-    return;
 }
 
 static void change_process_uid(void)
diff --git a/qemu-common.h b/qemu-common.h
index 15d9e4ed71..b54612b1a5 100644
--- a/qemu-common.h
+++ b/qemu-common.h
@@ -223,11 +223,19 @@ int qemu_pipe(int pipefd[2]);
 #endif
 
 #ifdef _WIN32
-/* MinGW needs a type cast for the 'buf' argument. */
+/* MinGW needs type casts for the 'buf' and 'optval' arguments. */
+#define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
+    getsockopt(sockfd, level, optname, (void *)optval, optlen)
+#define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
+    setsockopt(sockfd, level, optname, (const void *)optval, optlen)
 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, (void *)buf, len, flags)
 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
     sendto(sockfd, (const void *)buf, len, flags, destaddr, addrlen)
 #else
+#define qemu_getsockopt(sockfd, level, optname, optval, optlen) \
+    getsockopt(sockfd, level, optname, optval, optlen)
+#define qemu_setsockopt(sockfd, level, optname, optval, optlen) \
+    setsockopt(sockfd, level, optname, optval, optlen)
 #define qemu_recv(sockfd, buf, len, flags) recv(sockfd, buf, len, flags)
 #define qemu_sendto(sockfd, buf, len, flags, destaddr, addrlen) \
     sendto(sockfd, buf, len, flags, destaddr, addrlen)
diff --git a/qemu-sockets.c b/qemu-sockets.c
index 1f14e8bc63..2b1ed2f0e9 100644
--- a/qemu-sockets.c
+++ b/qemu-sockets.c
@@ -266,7 +266,6 @@ static void wait_for_connect(void *opaque)
         s->callback(s->fd, s->opaque);
     }
     g_free(s);
-    return;
 }
 
 static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
@@ -282,7 +281,7 @@ static int inet_connect_addr(struct addrinfo *addr, bool *in_progress,
                 inet_strfamily(addr->ai_family), strerror(errno));
         return -1;
     }
-    setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+    qemu_setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
     if (connect_state != NULL) {
         socket_set_nonblock(sock);
     }
diff --git a/qga/commands-posix.c b/qga/commands-posix.c
index b9f357cb96..726930a909 100644
--- a/qga/commands-posix.c
+++ b/qga/commands-posix.c
@@ -988,8 +988,6 @@ int64_t qmp_guest_fsfreeze_thaw(Error **err)
 void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)
 {
     error_set(err, QERR_UNSUPPORTED);
-
-    return;
 }
 #endif
 
diff --git a/qga/commands-win32.c b/qga/commands-win32.c
index 54bc5462e2..5bd8fb27f2 100644
--- a/qga/commands-win32.c
+++ b/qga/commands-win32.c
@@ -180,8 +180,6 @@ int64_t qmp_guest_fsfreeze_thaw(Error **err)
 void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **err)
 {
     error_set(err, QERR_UNSUPPORTED);
-
-    return;
 }
 
 typedef enum {
diff --git a/savevm.c b/savevm.c
index c7fe283145..31fd2e0ad3 100644
--- a/savevm.c
+++ b/savevm.c
@@ -2201,7 +2201,6 @@ void qmp_xen_save_devices_state(const char *filename, Error **errp)
  the_end:
     if (saved_vm_running)
         vm_start();
-    return;
 }
 
 int load_vmstate(const char *name)
diff --git a/slirp/ip_icmp.h b/slirp/ip_icmp.h
index 1a1af91e1e..be4426b8e7 100644
--- a/slirp/ip_icmp.h
+++ b/slirp/ip_icmp.h
@@ -92,8 +92,8 @@ struct icmp {
 
 /*
  * Lower bounds on packet lengths for various types.
- * For the error advice packets must first insure that the
- * packet is large enought to contain the returned ip header.
+ * For the error advice packets must first ensure that the
+ * packet is large enough to contain the returned ip header.
  * Only then can we do the check to see if 64 bits of packet
  * data have been returned, since we need to check the returned
  * ip header length.
diff --git a/slirp/ip_input.c b/slirp/ip_input.c
index ce24faf165..6f4cff8fdd 100644
--- a/slirp/ip_input.c
+++ b/slirp/ip_input.c
@@ -213,7 +213,6 @@ ip_input(struct mbuf *m)
 	return;
 bad:
 	m_free(m);
-	return;
 }
 
 #define iptofrag(P) ((struct ipasfrag *)(((char*)(P)) - sizeof(struct qlink)))
diff --git a/slirp/tcp_input.c b/slirp/tcp_input.c
index 942aaf44f1..6440eae7fa 100644
--- a/slirp/tcp_input.c
+++ b/slirp/tcp_input.c
@@ -1281,8 +1281,6 @@ drop:
 	 * Drop space held by incoming segment and return.
 	 */
 	m_free(m);
-
-	return;
 }
 
 static void
diff --git a/slirp/udp.c b/slirp/udp.c
index ced509656d..9286cb7d31 100644
--- a/slirp/udp.c
+++ b/slirp/udp.c
@@ -231,7 +231,6 @@ udp_input(register struct mbuf *m, int iphlen)
 	return;
 bad:
 	m_free(m);
-	return;
 }
 
 int udp_output2(struct socket *so, struct mbuf *m,
diff --git a/target-unicore32/translate.c b/target-unicore32/translate.c
index 36f4f2f966..c3cdafa18e 100644
--- a/target-unicore32/translate.c
+++ b/target-unicore32/translate.c
@@ -1932,8 +1932,6 @@ static void disas_uc32_insn(CPUUniCore32State *env, DisasContext *s)
         }
         ILLEGAL;
     }
-
-    return;
 }
 
 /* generate intermediate code in gen_opc_buf and gen_opparam_buf for
diff --git a/tcg/arm/tcg-target.c b/tcg/arm/tcg-target.c
index fbbbefe985..737200e5e6 100644
--- a/tcg/arm/tcg-target.c
+++ b/tcg/arm/tcg-target.c
@@ -1197,20 +1197,11 @@ static inline void tcg_out_qemu_ld(TCGContext *s, const TCGArg *args, int opc)
     case 1:
     case 2:
     default:
-        if (data_reg != TCG_REG_R0) {
-            tcg_out_dat_reg(s, COND_AL, ARITH_MOV,
-                            data_reg, 0, TCG_REG_R0, SHIFT_IMM_LSL(0));
-        }
+        tcg_out_mov_reg(s, COND_AL, data_reg, TCG_REG_R0);
         break;
     case 3:
-        if (data_reg != TCG_REG_R0) {
-            tcg_out_dat_reg(s, COND_AL, ARITH_MOV,
-                            data_reg, 0, TCG_REG_R0, SHIFT_IMM_LSL(0));
-        }
-        if (data_reg2 != TCG_REG_R1) {
-            tcg_out_dat_reg(s, COND_AL, ARITH_MOV,
-                            data_reg2, 0, TCG_REG_R1, SHIFT_IMM_LSL(0));
-        }
+        tcg_out_mov_reg(s, COND_AL, data_reg, TCG_REG_R0);
+        tcg_out_mov_reg(s, COND_AL, data_reg2, TCG_REG_R1);
         break;
     }
 
diff --git a/ui/vnc-auth-sasl.c b/ui/vnc-auth-sasl.c
index bfdcb46efe..f3ad75d52b 100644
--- a/ui/vnc-auth-sasl.c
+++ b/ui/vnc-auth-sasl.c
@@ -617,7 +617,6 @@ void start_auth_sasl(VncState *vs)
 
  authabort:
     vnc_client_error(vs);
-    return;
 }
 
 
diff --git a/ui/vnc-tls.c b/ui/vnc-tls.c
index 3aaa93928a..a7f7d07ac8 100644
--- a/ui/vnc-tls.c
+++ b/ui/vnc-tls.c
@@ -49,7 +49,7 @@ static int vnc_tls_initialize(void)
     if (gnutls_global_init () < 0)
         return 0;
 
-    /* XXX ought to re-generate diffie-hellmen params periodically */
+    /* XXX ought to re-generate diffie-hellman params periodically */
     if (gnutls_dh_params_init (&dh_params) < 0)
         return 0;
     if (gnutls_dh_params_generate2 (dh_params, DH_BITS) < 0)
diff --git a/vl.c b/vl.c
index 02dade19fc..5b357a3b06 100644
--- a/vl.c
+++ b/vl.c
@@ -1023,7 +1023,6 @@ static void numa_add(const char *optarg)
         }
         nb_numa_nodes++;
     }
-    return;
 }
 
 static void smp_parse(const char *optarg)
diff --git a/xen-all.c b/xen-all.c
index e6308be23a..bcb7ef7c84 100644
--- a/xen-all.c
+++ b/xen-all.c
@@ -1092,7 +1092,6 @@ static void xen_read_physmap(XenIOState *state)
         QLIST_INSERT_HEAD(&state->physmap, physmap, list);
     }
     free(entries);
-    return;
 }
 
 int xen_hvm_init(void)