diff --git a/CODING_STYLE b/CODING_STYLE
index f53180bf3f..2fa0c0b65b 100644
--- a/CODING_STYLE
+++ b/CODING_STYLE
@@ -116,3 +116,10 @@ if (a == 1) {
 Rationale: Yoda conditions (as in 'if (1 == a)') are awkward to read.
 Besides, good compilers already warn users when '==' is mis-typed as '=',
 even when the constant is on the right.
+
+7. Comment style
+
+We use traditional C-style /* */ comments and avoid // comments.
+
+Rationale: The // form is valid in C99, so this is purely a matter of
+consistency of style. The checkpatch script will warn you about this.
diff --git a/fpu/softfloat.c b/fpu/softfloat.c
index 485a006aa7..7af14e29aa 100644
--- a/fpu/softfloat.c
+++ b/fpu/softfloat.c
@@ -7492,7 +7492,7 @@ uint64_t float64_to_uint64_round_to_zero(float64 a, float_status *status)
 {
     signed char current_rounding_mode = status->float_rounding_mode;
     set_float_rounding_mode(float_round_to_zero, status);
-    int64_t v = float64_to_uint64(a, status);
+    uint64_t v = float64_to_uint64(a, status);
     set_float_rounding_mode(current_rounding_mode, status);
     return v;
 }
diff --git a/hw/acpi/tco.c b/hw/acpi/tco.c
index 8ce7daf23a..b4adac88cd 100644
--- a/hw/acpi/tco.c
+++ b/hw/acpi/tco.c
@@ -49,6 +49,7 @@ static inline void tco_timer_reload(TCOIORegs *tr)
 static inline void tco_timer_stop(TCOIORegs *tr)
 {
     tr->expire_time = -1;
+    timer_del(tr->tco_timer);
 }
 
 static void tco_timer_expired(void *opaque)
diff --git a/hw/core/or-irq.c b/hw/core/or-irq.c
index 1ac090d1a4..1485d5b285 100644
--- a/hw/core/or-irq.c
+++ b/hw/core/or-irq.c
@@ -89,6 +89,9 @@ static void or_irq_class_init(ObjectClass *klass, void *data)
     dc->props = or_irq_properties;
     dc->realize = or_irq_realize;
     dc->vmsd = &vmstate_or_irq;
+
+    /* Reason: Needs to be wired up to work, e.g. see stm32f205_soc.c */
+    dc->cannot_instantiate_with_device_add_yet = true;
 }
 
 static const TypeInfo or_irq_type_info = {
diff --git a/hw/core/register.c b/hw/core/register.c
index 4bfbc508de..dc335a79a9 100644
--- a/hw/core/register.c
+++ b/hw/core/register.c
@@ -59,6 +59,15 @@ static inline uint64_t register_read_val(RegisterInfo *reg)
     return 0; /* unreachable */
 }
 
+static inline uint64_t register_enabled_mask(int data_size, unsigned size)
+{
+    if (data_size < size) {
+        size = data_size;
+    }
+
+    return MAKE_64BIT_MASK(0, size * 8);
+}
+
 void register_write(RegisterInfo *reg, uint64_t val, uint64_t we,
                     const char *prefix, bool debug)
 {
@@ -192,11 +201,7 @@ void register_write_memory(void *opaque, hwaddr addr,
     }
 
     /* Generate appropriate write enable mask */
-    if (reg->data_size < size) {
-        we = MAKE_64BIT_MASK(0, reg->data_size * 8);
-    } else {
-        we = MAKE_64BIT_MASK(0, size * 8);
-    }
+    we = register_enabled_mask(reg->data_size, size);
 
     register_write(reg, value, we, reg_array->prefix,
                    reg_array->debug);
@@ -208,6 +213,7 @@ uint64_t register_read_memory(void *opaque, hwaddr addr,
     RegisterInfoArray *reg_array = opaque;
     RegisterInfo *reg = NULL;
     uint64_t read_val;
+    uint64_t re;
     int i;
 
     for (i = 0; i < reg_array->num_elements; i++) {
@@ -223,7 +229,10 @@ uint64_t register_read_memory(void *opaque, hwaddr addr,
         return 0;
     }
 
-    read_val = register_read(reg, size * 8, reg_array->prefix,
+    /* Generate appropriate read enable mask */
+    re = register_enabled_mask(reg->data_size, size);
+
+    read_val = register_read(reg, re, reg_array->prefix,
                              reg_array->debug);
 
     return extract64(read_val, 0, size * 8);
@@ -274,9 +283,18 @@ void register_finalize_block(RegisterInfoArray *r_array)
     g_free(r_array);
 }
 
+static void register_class_init(ObjectClass *oc, void *data)
+{
+    DeviceClass *dc = DEVICE_CLASS(oc);
+
+    /* Reason: needs to be wired up to work */
+    dc->cannot_instantiate_with_device_add_yet = true;
+}
+
 static const TypeInfo register_info = {
     .name  = TYPE_REGISTER,
     .parent = TYPE_DEVICE,
+    .class_init = register_class_init,
 };
 
 static void register_register_types(void)
diff --git a/hw/display/milkymist-tmu2.c b/hw/display/milkymist-tmu2.c
index 7528665510..59120ddb67 100644
--- a/hw/display/milkymist-tmu2.c
+++ b/hw/display/milkymist-tmu2.c
@@ -293,7 +293,7 @@ static void tmu2_start(MilkymistTMU2State *s)
     cpu_physical_memory_unmap(mesh, mesh_len, 0, mesh_len);
 
     /* Write back the OpenGL framebuffer to the QEMU framebuffer */
-    fb_len = 2 * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
+    fb_len = 2ULL * s->regs[R_DSTHRES] * s->regs[R_DSTVRES];
     fb = cpu_physical_memory_map(s->regs[R_DSTFBUF], &fb_len, 1);
     if (fb == NULL) {
         glDeleteTextures(1, &texture);
diff --git a/hw/net/cadence_gem.c b/hw/net/cadence_gem.c
index e99d4544a2..d4de8ad9f1 100644
--- a/hw/net/cadence_gem.c
+++ b/hw/net/cadence_gem.c
@@ -508,7 +508,7 @@ static void gem_update_int_status(CadenceGEMState *s)
 
     if ((s->num_priority_queues == 1) && s->regs[GEM_ISR]) {
         /* No priority queues, just trigger the interrupt */
-        DB_PRINT("asserting int.\n", i);
+        DB_PRINT("asserting int.\n");
         qemu_set_irq(s->irq[0], 1);
         return;
     }
diff --git a/include/qemu-common.h b/include/qemu-common.h
index 1430390eb6..d218821c14 100644
--- a/include/qemu-common.h
+++ b/include/qemu-common.h
@@ -19,7 +19,7 @@
 #include "qemu/option.h"
 
 /* Copyright string for -version arguments, About dialogs, etc */
-#define QEMU_COPYRIGHT "Copyright (c) 2003-2016 " \
+#define QEMU_COPYRIGHT "Copyright (c) 2003-2017 " \
     "Fabrice Bellard and the QEMU Project developers"
 
 /* main function, renamed */
diff --git a/qemu-options.hx b/qemu-options.hx
index bf458f83c3..faf5cf8d45 100644
--- a/qemu-options.hx
+++ b/qemu-options.hx
@@ -2146,7 +2146,7 @@ Example:
 @example
 qemu -m 512 -object memory-backend-file,id=mem,size=512M,mem-path=/hugetlbfs,share=on \
      -numa node,memdev=mem \
-     -chardev socket,path=/path/to/socket \
+     -chardev socket,id=chr0,path=/path/to/socket \
      -netdev type=vhost-user,id=net0,chardev=chr0 \
      -device virtio-net-pci,netdev=net0
 @end example
diff --git a/target/s390x/cpu_models.c b/target/s390x/cpu_models.c
index 5b66d3325d..2a894eec65 100644
--- a/target/s390x/cpu_models.c
+++ b/target/s390x/cpu_models.c
@@ -671,7 +671,7 @@ static S390CPUModel *get_max_cpu_model(Error **errp)
     if (kvm_enabled()) {
         kvm_s390_get_host_cpu_model(&max_model, errp);
     } else {
-        /* TCG enulates a z900 */
+        /* TCG emulates a z900 */
         max_model.def = &s390_cpu_defs[0];
         bitmap_copy(max_model.features, max_model.def->default_feat,
                     S390_FEAT_MAX);
diff --git a/tests/Makefile.include b/tests/Makefile.include
index e60bb6ce58..3310c170a3 100644
--- a/tests/Makefile.include
+++ b/tests/Makefile.include
@@ -308,8 +308,7 @@ check-qtest-sparc-y = tests/prom-env-test$(EXESUF)
 check-qtest-sparc64-y = tests/endianness-test$(EXESUF)
 #check-qtest-sparc64-y += tests/m48t59-test$(EXESUF)
 #gcov-files-sparc64-y += hw/timer/m48t59.c
-#Disabled for now, triggers a TCG bug on 32-bit hosts
-#check-qtest-sparc64-y += tests/prom-env-test$(EXESUF)
+check-qtest-sparc64-y += tests/prom-env-test$(EXESUF)
 
 check-qtest-arm-y = tests/tmp105-test$(EXESUF)
 check-qtest-arm-y += tests/ds1338-test$(EXESUF)
diff --git a/tests/ide-test.c b/tests/ide-test.c
index fb541f88b5..b57c2b1676 100644
--- a/tests/ide-test.c
+++ b/tests/ide-test.c
@@ -544,6 +544,7 @@ static void make_dirty(uint8_t device)
 
     guest_buf = guest_alloc(guest_malloc, len);
     buf = g_malloc(len);
+    memset(buf, rand() % 255 + 1, len);
     g_assert(guest_buf);
     g_assert(buf);
 
diff --git a/tests/prom-env-test.c b/tests/prom-env-test.c
index bd33bc353d..eac207b30e 100644
--- a/tests/prom-env-test.c
+++ b/tests/prom-env-test.c
@@ -76,7 +76,7 @@ static void add_tests(const char *machines[])
 int main(int argc, char *argv[])
 {
     const char *sparc_machines[] = { "SPARCbook", "Voyager", "SS-20", NULL };
-    const char *sparc64_machines[] = { "sun4u", "sun4v", NULL };
+    const char *sparc64_machines[] = { "sun4u", NULL };
     const char *ppc_machines[] = { "mac99", "g3beige", NULL };
     const char *ppc64_machines[] = { "mac99", "g3beige", "pseries", NULL };
     const char *arch = qtest_get_arch();