kernel: Using boolean constants instead of 0 or 1

MISRA C requires that every controlling expression of and if or while
statement have a boolean type.

Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>

kernel/alert.c

@@ -17,6 +17,7 @@
 #include <toolchain.h>
 #include <linker/sections.h>
 #include <syscall_handler.h>
+#include <stdbool.h>
 
 extern struct k_alert _k_alert_list_start[];
 extern struct k_alert _k_alert_list_end[];
@@ -48,7 +49,7 @@ void _alert_deliver(struct k_work *work)
 {
 	struct k_alert *alert = CONTAINER_OF(work, struct k_alert, work_item);
 
-	while (1) {
+	while (true) {
 		if ((alert->handler)(alert) == 0) {
 			/* do nothing -- handler has processed the alert */
 		} else {

kernel/idle.c

@@ -11,6 +11,7 @@
 #include <drivers/system_timer.h>
 #include <wait_q.h>
 #include <power.h>
+#include <stdbool.h>
 
 #if defined(CONFIG_TICKLESS_IDLE)
 /*
@@ -20,7 +21,7 @@
 s32_t _sys_idle_threshold_ticks = CONFIG_TICKLESS_IDLE_THRESH;
 
 #if defined(CONFIG_TICKLESS_KERNEL)
-#define _must_enter_tickless_idle(ticks) (1)
+#define _must_enter_tickless_idle(ticks) (true)
 #else
 #define _must_enter_tickless_idle(ticks) \
 		((ticks == K_FOREVER) || (ticks >= _sys_idle_threshold_ticks))
@@ -47,7 +48,6 @@ void __attribute__((weak)) _sys_soc_resume_from_deep_sleep(void)
 {
 }
 #endif
-
 /**
  *
  * @brief Indicate that kernel is idling in tickless mode
@@ -64,7 +64,7 @@ static void set_kernel_idle_time_in_ticks(s32_t ticks)
 	_kernel.idle = ticks;
 }
 #else
-#define set_kernel_idle_time_in_ticks(x) do { } while (0)
+#define set_kernel_idle_time_in_ticks(x) do { } while (false)
 #endif
 
 #ifndef CONFIG_SMP
@@ -175,7 +175,7 @@ void idle(void *unused1, void *unused2, void *unused3)
 	 * busy waiting is needed to prevent lock contention.  Long
 	 * term we need to wake up idle CPUs with an IPI.
 	 */
-	while (1) {
+	while (true) {
 		k_busy_wait(100);
 		k_yield();
 	}

kernel/include/kernel_internal.h

@@ -15,6 +15,7 @@
 #define ZEPHYR_KERNEL_INCLUDE_KERNEL_INTERNAL_H_
 
 #include <kernel.h>
+#include <stdbool.h>
 
 #ifndef _ASMLANGUAGE
 
@@ -198,7 +199,7 @@ extern void _thread_monitor_exit(struct k_thread *thread);
 #else
 #define _thread_monitor_exit(thread) \
 	do {/* nothing */    \
-	} while (0)
+	} while (false)
 #endif /* CONFIG_THREAD_MONITOR */
 
 extern void smp_init(void);

kernel/include/syscall_handler.h

@@ -14,6 +14,7 @@
 #include <kernel.h>
 #include <misc/printk.h>
 #include <kernel_internal.h>
+#include <stdbool.h>
 
 extern const _k_syscall_handler_t _k_syscall_table[K_SYSCALL_LIMIT];
 
@@ -259,7 +260,7 @@ extern int z_user_string_copy(char *dst, char *src, size_t maxlen);
 		if (expr) { \
 			_arch_syscall_oops(ssf); \
 		} \
-	} while (0)
+	} while (false)
 
 static inline __attribute__((warn_unused_result)) __printf_like(2, 3)
 bool z_syscall_verify_msg(bool expr, const char *fmt, ...)

kernel/init.c

@@ -32,6 +32,7 @@
 #include <entropy.h>
 #include <logging/log_ctrl.h>
 #include <tracing.h>
+#include <stdbool.h>
 
 /* kernel build timestamp items */
 #define BUILD_TIMESTAMP "BUILD: " __DATE__ " " __TIME__
@@ -55,7 +56,7 @@ static const unsigned int boot_delay;
 #endif
 
 #if !defined(CONFIG_BOOT_BANNER)
-#define PRINT_BOOT_BANNER() do { } while (0)
+#define PRINT_BOOT_BANNER() do { } while (false)
 #else
 #define PRINT_BOOT_BANNER() printk("***** " BOOT_BANNER " *****\n")
 #endif
@@ -493,7 +494,7 @@ FUNC_NORETURN void _Cstart(void)
 	bg_thread_main(NULL, NULL, NULL);
 
 	irq_lock();
-	while (1) {
+	while (true) {
 	}
 #endif
 

kernel/mempool.c

@@ -10,6 +10,7 @@
 #include <init.h>
 #include <string.h>
 #include <misc/__assert.h>
+#include <stdbool.h>
 
 /* Linker-defined symbols bound the static pool structs */
 extern struct k_mem_pool _k_mem_pool_list_start[];
@@ -59,7 +60,7 @@ int k_mem_pool_alloc(struct k_mem_pool *p, struct k_mem_block *block,
 		end = _tick_get() + _ms_to_ticks(timeout);
 	}
 
-	while (1) {
+	while (true) {
 		u32_t level_num, block_num;
 
 		/* There is a "managed race" in alloc that can fail

kernel/sys_clock.c

@@ -252,7 +252,7 @@ static inline void handle_timeouts(s32_t ticks)
 	_handle_expired_timeouts(&expired);
 }
 #else
-	#define handle_timeouts(ticks) do { } while ((0))
+	#define handle_timeouts(ticks) do { } while (false)
 #endif
 
 #ifdef CONFIG_TIMESLICING
@@ -295,7 +295,7 @@ static void handle_time_slicing(s32_t ticks)
 #endif
 }
 #else
-#define handle_time_slicing(ticks) do { } while (0)
+#define handle_time_slicing(ticks) do { } while (false)
 #endif
 
 /**

kernel/thread.c

@@ -661,7 +661,7 @@ void k_thread_access_grant(struct k_thread *thread, ...)
 	va_list args;
 	va_start(args, thread);
 
-	while (1) {
+	while (true) {
 		void *object = va_arg(args, void *);
 		if (object == NULL) {
 			break;

kernel/work_q.c

@@ -14,6 +14,7 @@
 #include <kernel_structs.h>
 #include <wait_q.h>
 #include <errno.h>
+#include <stdbool.h>
 
 static void work_q_main(void *work_q_ptr, void *p2, void *p3)
 {
@@ -22,7 +23,7 @@ static void work_q_main(void *work_q_ptr, void *p2, void *p3)
 	ARG_UNUSED(p2);
 	ARG_UNUSED(p3);
 
-	while (1) {
+	while (true) {
 		struct k_work *work;
 		k_work_handler_t handler;