[includes] replace header guards with #pragma once

kernel/include/kernel/debug.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_DEBUG_H
-#define __KERNEL_DEBUG_H
+#pragma once
 
 #include <lk/compiler.h>
 
@@ -55,6 +54,3 @@ enum {
 #define KEVLOG_IRQ_EXIT(irqn) kernel_evlog_add(KERNEL_EVLOG_IRQ_EXIT, (uintptr_t)irqn, 0)
 
 __END_CDECLS
-
-#endif
-

kernel/include/kernel/event.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_EVENT_H
-#define __KERNEL_EVENT_H
+#pragma once
 
 #include <lk/compiler.h>
 #include <stdbool.h>
@@ -65,6 +64,3 @@ static inline status_t event_wait(event_t *e) {
 }
 
 __END_CDECLS
-
-#endif
-

kernel/include/kernel/mutex.h

@@ -6,8 +6,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_MUTEX_H
-#define __KERNEL_MUTEX_H
+#pragma once
 
 #include <lk/compiler.h>
 #include <lk/debug.h>
@@ -53,5 +52,3 @@ static bool is_mutex_held(mutex_t *m) {
 }
 
 __END_CDECLS
-#endif
-

kernel/include/kernel/novm.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_NOVM_H
-#define __KERNEL_NOVM_H
+#pragma once
 
 #include <stddef.h>
 #include <stdlib.h>
@@ -36,5 +35,3 @@ struct page_range {
 };
 
 int novm_get_arenas(struct page_range *ranges, int number_of_ranges);
-
-#endif

kernel/include/kernel/port.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_PORT_H
-#define __KERNEL_PORT_H
+#pragma once
 
 #include <sys/types.h>
 #include <lk/compiler.h>
@@ -89,6 +88,3 @@ status_t port_destroy(port_t port);
 status_t port_close(port_t port);
 
 __END_CDECLS
-
-#endif
-

kernel/include/kernel/semaphore.h

@@ -14,8 +14,7 @@
  * limitations under the License.
  */
 
-#ifndef __KERNEL_SEMAPHORE_H
-#define __KERNEL_SEMAPHORE_H
+#pragma once
 
 #include <lk/compiler.h>
 #include <kernel/thread.h>
@@ -46,4 +45,3 @@ status_t sem_trywait(semaphore_t *);
 status_t sem_timedwait(semaphore_t *, lk_time_t);
 
 __END_CDECLS
-#endif

kernel/include/kernel/thread.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_THREAD_H
-#define __KERNEL_THREAD_H
+#pragma once
 
 #include <sys/types.h>
 #include <lk/list.h>
@@ -234,5 +233,3 @@ extern struct thread_stats thread_stats[SMP_MAX_CPUS];
 #endif
 
 __END_CDECLS
-
-#endif

kernel/include/kernel/timer.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_TIMER_H
-#define __KERNEL_TIMER_H
+#pragma once
 
 #include <lk/compiler.h>
 #include <lk/list.h>
@@ -54,6 +53,3 @@ void timer_set_periodic(timer_t *, lk_time_t period, timer_callback, void *arg);
 void timer_cancel(timer_t *);
 
 __END_CDECLS
-
-#endif
-

kernel/include/kernel/wait.h

@@ -5,8 +5,7 @@
  * license that can be found in the LICENSE file or at
  * https://opensource.org/licenses/MIT
  */
-#ifndef __KERNEL_WAIT_H
-#define __KERNEL_WAIT_H
+#pragma once
 
 #include <sys/types.h>
 #include <lk/list.h>
@@ -67,6 +66,3 @@ int wait_queue_wake_all(wait_queue_t *, bool reschedule, status_t wait_queue_err
 status_t thread_unblock_from_wait_queue(struct thread *t, status_t wait_queue_error);
 
 __END_CDECLS
-
-#endif
-