diff --git a/core/atomic_c11.c b/core/atomic_c11.c
index 1983c4eeb2..d648a879c9 100644
--- a/core/atomic_c11.c
+++ b/core/atomic_c11.c
@@ -281,6 +281,7 @@ void __atomic_load_c(size_t size, const void *src, void *dest, int memorder)
 {
     (void)memorder;
     unsigned int mask = irq_disable();
+
     memcpy(dest, src, size);
     irq_restore(mask);
 }
@@ -297,6 +298,7 @@ void __atomic_store_c(size_t size, void *dest, const void *src, int memorder)
 {
     (void)memorder;
     unsigned int mask = irq_disable();
+
     memcpy(dest, src, size);
     irq_restore(mask);
 }
@@ -315,6 +317,7 @@ void __atomic_exchange_c(size_t size, void *ptr, void *val, void *ret,
 {
     (void)memorder;
     unsigned int mask = irq_disable();
+
     memcpy(ret, ptr, size);
     memcpy(ptr, val, size);
     irq_restore(mask);
@@ -361,6 +364,7 @@ bool __atomic_compare_exchange_c(size_t len, void *ptr, void *expected,
     (void)failure_memorder;
     unsigned int mask = irq_disable();
     bool ret;
+
     if (memcmp(ptr, expected, len) == 0) {
         memcpy(ptr, desired, len);
         ret = true;
diff --git a/core/include/cib.h b/core/include/cib.h
index 087ec1c7a0..875d98c076 100644
--- a/core/include/cib.h
+++ b/core/include/cib.h
@@ -61,6 +61,7 @@ static inline void cib_init(cib_t *__restrict cib, unsigned int size)
     assert(!(size & (size - 1)));
 
     cib_t c = CIB_INIT(size);
+
     *cib = c;
 }
 
diff --git a/core/include/macros/units.h b/core/include/macros/units.h
index daa04ff4c5..ff3a6ca98d 100644
--- a/core/include/macros/units.h
+++ b/core/include/macros/units.h
@@ -20,7 +20,7 @@
 #define MACROS_UNITS_H
 
 #ifdef __cplusplus
- extern "C" {
+extern "C" {
 #endif
 
 /**
diff --git a/core/include/msg_bus.h b/core/include/msg_bus.h
index a416e8ff9e..ef1c29c13c 100644
--- a/core/include/msg_bus.h
+++ b/core/include/msg_bus.h
@@ -101,7 +101,8 @@ static inline uint16_t msg_bus_get_type(const msg_t *msg)
 {
     if (msg->sender_pid & MSB_BUS_PID_FLAG) {
         return msg->type & 0x1F;
-    } else {
+    }
+    else {
         return msg->type;
     }
 }
diff --git a/core/init.c b/core/init.c
index dbb6a60df0..b39cc48164 100644
--- a/core/init.c
+++ b/core/init.c
@@ -37,7 +37,8 @@
 #include "debug.h"
 
 #ifndef CONFIG_BOOT_MSG_STRING
-#define CONFIG_BOOT_MSG_STRING "main(): This is RIOT! (Version: " RIOT_VERSION ")"
+#define CONFIG_BOOT_MSG_STRING "main(): This is RIOT! (Version: " \
+    RIOT_VERSION ")"
 #endif
 
 extern int main(void);
@@ -73,7 +74,6 @@ static void *idle_thread(void *arg)
     return NULL;
 }
 
-
 void kernel_init(void)
 {
     irq_disable();
diff --git a/core/mbox.c b/core/mbox.c
index 6a186cfc00..a1d9ddebd4 100644
--- a/core/mbox.c
+++ b/core/mbox.c
@@ -36,6 +36,7 @@ static void _wake_waiter(thread_t *thread, unsigned irqstate)
           "%" PRIkernel_pid ".\n", thread_getpid(), thread->pid);
 
     uint16_t process_priority = thread->priority;
+
     irq_restore(irqstate);
     sched_switch(process_priority);
 }
@@ -46,6 +47,7 @@ static void _wait(list_node_t *wait_list, unsigned irqstate)
           thread_getpid());
 
     thread_t *me = thread_get_active();
+
     sched_set_status(me, STATUS_MBOX_BLOCKED);
     thread_add_to_list(wait_list, me);
     irq_restore(irqstate);
diff --git a/core/msg.c b/core/msg.c
index 6c04a51b30..0f356b74d3 100644
--- a/core/msg.c
+++ b/core/msg.c
@@ -52,6 +52,7 @@ static int queue_msg(thread_t *target, const msg_t *m)
 
     DEBUG("queue_msg(): queuing message\n");
     msg_t *dest = &target->msg_array[n];
+
     *dest = *m;
 #if MODULE_CORE_THREAD_FLAGS
     target->flags |= THREAD_FLAG_MSG_WAITING;
@@ -242,7 +243,7 @@ int msg_send_bus(msg_t *m, msg_bus_t *bus)
     int count = 0;
 
     m->sender_pid = (in_irq ? KERNEL_PID_ISR : thread_getpid())
-                  | MSB_BUS_PID_FLAG;
+                    | MSB_BUS_PID_FLAG;
 
     unsigned state = irq_disable();
 
@@ -272,6 +273,7 @@ int msg_send_receive(msg_t *m, msg_t *reply, kernel_pid_t target_pid)
     assert(thread_getpid() != target_pid);
     unsigned state = irq_disable();
     thread_t *me = thread_get_active();
+
     sched_set_status(me, STATUS_REPLY_BLOCKED);
     me->wait_data = reply;
 
@@ -302,9 +304,11 @@ int msg_reply(msg_t *m, msg_t *reply)
           thread_getpid());
     /* copy msg to target */
     msg_t *target_message = (msg_t *)target->wait_data;
+
     *target_message = *reply;
     sched_set_status(target, STATUS_PENDING);
     uint16_t target_prio = target->priority;
+
     irq_restore(state);
     sched_switch(target_prio);
 
@@ -323,6 +327,7 @@ int msg_reply_int(msg_t *m, msg_t *reply)
     }
 
     msg_t *target_message = (msg_t *)target->wait_data;
+
     *target_message = *reply;
     sched_set_status(target, STATUS_PENDING);
     sched_context_switch_request = 1;
@@ -394,7 +399,7 @@ static int _msg_receive(msg_t *m, int block)
     }
     else {
         DEBUG("_msg_receive: %" PRIkernel_pid ": _msg_receive(): Waking up "
-             "waiting thread.\n", thread_getpid());
+              "waiting thread.\n", thread_getpid());
 
         thread_t *sender =
             container_of((clist_node_t *)next, thread_t, rq_entry);
diff --git a/core/mutex.c b/core/mutex.c
index c8682614f7..cba168ee81 100644
--- a/core/mutex.c
+++ b/core/mutex.c
@@ -45,9 +45,11 @@
  * function into both @ref mutex_lock and @ref mutex_lock_cancelable is,
  * therefore, beneficial for the majority of applications.
  */
-static inline __attribute__((always_inline)) void _block(mutex_t *mutex, unsigned irq_state)
+static inline __attribute__((always_inline)) void _block(mutex_t *mutex,
+                                                         unsigned irq_state)
 {
     thread_t *me = thread_get_active();
+
     DEBUG("PID[%" PRIkernel_pid "] mutex_lock() Adding node to mutex queue: "
           "prio: %" PRIu32 "\n", thread_getpid(), (uint32_t)me->priority);
     sched_set_status(me, STATUS_MUTEX_BLOCKED);
@@ -97,6 +99,7 @@ int mutex_lock_cancelable(mutex_cancel_t *mc)
     }
 
     mutex_t *mutex = mc->mutex;
+
     if (mutex->queue.next == NULL) {
         /* mutex is unlocked. */
         mutex->queue.next = MUTEX_LOCKED;
@@ -111,7 +114,7 @@ int mutex_lock_cancelable(mutex_cancel_t *mc)
             DEBUG("PID[%" PRIkernel_pid "] mutex_lock_cancelable() "
                   "cancelled.\n", thread_getpid());
         }
-        return (mc->cancelled) ? -ECANCELED: 0;
+        return (mc->cancelled) ? -ECANCELED : 0;
     }
 }
 
@@ -148,6 +151,7 @@ void mutex_unlock(mutex_t *mutex)
     }
 
     uint16_t process_priority = process->priority;
+
     irq_restore(irqstate);
     sched_switch(process_priority);
 }
@@ -185,10 +189,12 @@ void mutex_unlock_and_sleep(mutex_t *mutex)
 void mutex_cancel(mutex_cancel_t *mc)
 {
     unsigned irq_state = irq_disable();
+
     mc->cancelled = 1;
 
     mutex_t *mutex = mc->mutex;
     thread_t *thread = mc->thread;
+
     if (thread_is_active(thread)) {
         /* thread is still running or about to run, so it will check
          * `mc-cancelled` in time */
@@ -197,8 +203,8 @@ void mutex_cancel(mutex_cancel_t *mc)
     }
 
     if ((mutex->queue.next != MUTEX_LOCKED)
-            && (mutex->queue.next != NULL)
-            && list_remove(&mutex->queue, (list_node_t *)&thread->rq_entry)) {
+        && (mutex->queue.next != NULL)
+        && list_remove(&mutex->queue, (list_node_t *)&thread->rq_entry)) {
         /* Thread was queued and removed from list, wake it up */
         if (mutex->queue.next == NULL) {
             mutex->queue.next = MUTEX_LOCKED;
diff --git a/core/panic.c b/core/panic.c
index ec8c609d04..6f04d79481 100644
--- a/core/panic.c
+++ b/core/panic.c
@@ -48,8 +48,10 @@ const char assert_crash_message[] = "FAILED ASSERTION.";
 /* flag preventing "recursive crash printing loop" */
 static int crashed = 0;
 
-void __attribute__((weak)) panic_arch(void) {}
-void __attribute__((weak)) panic_app(core_panic_t crash_code, const char *message)
+void __attribute__((weak)) panic_arch(void)
+{}
+void __attribute__((weak)) panic_app(core_panic_t crash_code,
+                                     const char *message)
 {
     (void)crash_code;
     (void)message;
diff --git a/core/thread.c b/core/thread.c
index e3ae5ae8c4..8e318c2f82 100644
--- a/core/thread.c
+++ b/core/thread.c
@@ -102,6 +102,7 @@ void thread_sleep(void)
     }
 
     unsigned state = irq_disable();
+
     sched_set_status(thread_get_active(), STATUS_SLEEPING);
     irq_restore(state);
     thread_yield_higher();
@@ -183,6 +184,7 @@ uintptr_t thread_measure_stack_free(const char *stack)
     }
 
     uintptr_t space_free = (uintptr_t)stackp - (uintptr_t)stack;
+
     return space_free;
 }
 #endif
@@ -199,7 +201,7 @@ kernel_pid_t thread_create(char *stack, int stacksize, uint8_t priority,
     int total_stacksize = stacksize;
 #endif
 #ifndef CONFIG_THREAD_NAMES
-    (void) name;
+    (void)name;
 #endif
 
     /* align the stack on a 16/32bit boundary */
@@ -342,7 +344,7 @@ const char *thread_state_to_string(thread_status_t state)
     const char *name = state_names[state] ? state_names[state] : NULL;
 
     assert(name != NULL); /* if compiling with assertions, this is an error that
-                            indicates that the table above is incomplete */
+                             indicates that the table above is incomplete */
 
     return (name != NULL) ? name : STATE_NAME_UNKNOWN;
 }
diff --git a/core/thread_flags.c b/core/thread_flags.c
index ff3b91eea6..1d4db08f10 100644
--- a/core/thread_flags.c
+++ b/core/thread_flags.c
@@ -18,7 +18,6 @@
  * @}
  */
 
-
 #include "thread_flags.h"
 #include "irq.h"
 #include "thread.h"
@@ -26,7 +25,8 @@
 #define ENABLE_DEBUG 0
 #include "debug.h"
 
-static inline int __attribute__((always_inline)) _thread_flags_wake(thread_t *thread)
+static inline int __attribute__((always_inline)) _thread_flags_wake(
+    thread_t *thread)
 {
     unsigned wakeup;
     thread_flags_t mask = (uint16_t)(unsigned)thread->wait_data;
@@ -118,6 +118,7 @@ thread_flags_t thread_flags_wait_one(thread_flags_t mask)
     _thread_flags_wait_any(mask);
     thread_t *me = thread_get_active();
     thread_flags_t tmp = me->flags & mask;
+
     /* clear all but least significant bit */
     tmp &= (~tmp + 1);
     return _thread_flags_clear_atomic(me, tmp);
@@ -146,6 +147,7 @@ void thread_flags_set(thread_t *thread, thread_flags_t mask)
     DEBUG("thread_flags_set(): setting 0x%08x for pid %" PRIkernel_pid "\n",
           mask, thread->pid);
     unsigned state = irq_disable();
+
     thread->flags |= mask;
     if (_thread_flags_wake(thread)) {
         irq_restore(state);