kernel: reduce scope of z_new_thread_init()

The core kernel z_setup_new_thread() calls into arch_new_thread(),
which calls back into the core kernel via z_new_thread_init().

Move everything that doesn't have to be in z_new_thread_init() to
z_setup_new_thread() and convert to an inline function.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>

arch/arc/core/thread.c

@@ -137,7 +137,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 #endif
 	}
 
-	z_new_thread_init(thread, pStackMem, stackAdjSize, priority, options);
+	z_new_thread_init(thread, pStackMem, stackAdjSize);
 
 	/* carve the thread entry struct from the "base" of
 		the privileged stack */
@@ -164,7 +164,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 	pStackMem += ARCH_THREAD_STACK_RESERVED;
 	stackEnd = pStackMem + stackSize;
 
-	z_new_thread_init(thread, pStackMem, stackSize, priority, options);
+	z_new_thread_init(thread, pStackMem, stackSize);
 
 	stackAdjEnd = stackEnd;
 

arch/arm/core/aarch32/thread.c

@@ -94,8 +94,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 
 	struct __esf *pInitCtx;
 
-	z_new_thread_init(thread, pStackMem, stackSize, priority,
-			 options);
+	z_new_thread_init(thread, pStackMem, stackSize);
 
 	/* Carve the thread entry struct from the "base" of the stack
 	 *

arch/arm/core/aarch64/thread.c

@@ -71,7 +71,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 
 	stackEnd = pStackMem + stackSize;
 
-	z_new_thread_init(thread, pStackMem, stackSize, priority, options);
+	z_new_thread_init(thread, pStackMem, stackSize);
 
 	pInitCtx = (struct init_stack_frame *)(STACK_ROUND_DOWN(stackEnd -
 				    sizeof(struct init_stack_frame)));

arch/nios2/core/thread.c

@@ -38,7 +38,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 
 	struct init_stack_frame *iframe;
 
-	z_new_thread_init(thread, stack_memory, stack_size, priority, options);
+	z_new_thread_init(thread, stack_memory, stack_size);
 
 	/* Initial stack frame data, stored at the base of the stack */
 	iframe = (struct init_stack_frame *)

arch/posix/core/thread.c

@@ -36,7 +36,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 
 	posix_thread_status_t *thread_status;
 
-	z_new_thread_init(thread, stack_memory, stack_size, priority, options);
+	z_new_thread_init(thread, stack_memory, stack_size);
 
 	/* We store it in the same place where normal archs store the
 	 * "initial stack frame"

arch/riscv/core/thread.c

@@ -22,7 +22,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 
 	struct __esf *stack_init;
 
-	z_new_thread_init(thread, stack_memory, stack_size, priority, options);
+	z_new_thread_init(thread, stack_memory, stack_size);
 
 	/* Initial stack frame for thread */
 	stack_init = (struct __esf *)

arch/x86/core/ia32/thread.c

@@ -71,7 +71,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 
 	Z_ASSERT_VALID_PRIO(priority, entry);
 	stack_buf = Z_THREAD_STACK_BUFFER(stack);
-	z_new_thread_init(thread, stack_buf, stack_size, priority, options);
+	z_new_thread_init(thread, stack_buf, stack_size);
 
 #if CONFIG_X86_STACK_PROTECTION
 	struct z_x86_thread_stack_header *header =

arch/x86/core/intel64/thread.c

@@ -19,8 +19,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 	void *switch_entry;
 
 	Z_ASSERT_VALID_PRIO(priority, entry);
-	z_new_thread_init(thread, Z_THREAD_STACK_BUFFER(stack),
-			  stack_size, priority, options);
+	z_new_thread_init(thread, Z_THREAD_STACK_BUFFER(stack), stack_size);
 
 #if CONFIG_X86_STACK_PROTECTION
 	struct z_x86_thread_stack_header *header =

arch/xtensa/core/xtensa-asm2.c

@@ -67,7 +67,7 @@ void arch_new_thread(struct k_thread *thread, k_thread_stack_t *stack,
 	/* Align downward.  The API as specified requires a runtime check. */
 	top = (char *)(((unsigned int)top) & ~3);
 
-	z_new_thread_init(thread, base, sz, prio, opts);
+	z_new_thread_init(thread, base, sz);
 
 	thread->switch_handle = xtensa_init_stack((void *)top, entry,
 						  p1, p2, p3);

kernel/include/kernel_internal.h

@@ -46,9 +46,22 @@ extern void z_setup_new_thread(struct k_thread *new_thread,
 			      void *p1, void *p2, void *p3,
 			      int prio, u32_t options, const char *name);
 
-extern void z_new_thread_init(struct k_thread *thread,
-					    char *pStack, size_t stackSize,
-					    int prio, unsigned int options);
+static inline void z_new_thread_init(struct k_thread *thread,
+				     char *stack, size_t stack_size)
+{
+#if !defined(CONFIG_INIT_STACKS) && !defined(CONFIG_THREAD_STACK_INFO)
+	ARG_UNUSED(stack);
+	ARG_UNUSED(stack_size);
+	ARG_UNUSED(thread);
+#endif
+#ifdef CONFIG_INIT_STACKS
+	memset(stack, 0xaa, stack_size);
+#endif
+#if defined(CONFIG_THREAD_STACK_INFO)
+	thread->stack_info.start = (uintptr_t)stack;
+	thread->stack_info.size = stack_size;
+#endif /* CONFIG_THREAD_STACK_INFO */
+}
 
 /**
  * @brief Allocate some memory from the current thread's resource pool

kernel/thread.c

@@ -462,51 +462,6 @@ static inline size_t adjust_stack_size(size_t stack_size)
 
 #endif /* CONFIG_STACK_POINTER_RANDOM */
 
-void z_new_thread_init(struct k_thread *thread,
-					    char *pStack, size_t stackSize,
-					    int prio, unsigned int options)
-{
-#if !defined(CONFIG_INIT_STACKS) && !defined(CONFIG_THREAD_STACK_INFO)
-	ARG_UNUSED(pStack);
-	ARG_UNUSED(stackSize);
-#endif
-
-#ifdef CONFIG_INIT_STACKS
-	memset(pStack, 0xaa, stackSize);
-#endif
-#ifdef CONFIG_STACK_SENTINEL
-	/* Put the stack sentinel at the lowest 4 bytes of the stack area.
-	 * We periodically check that it's still present and kill the thread
-	 * if it isn't.
-	 */
-	*((u32_t *)pStack) = STACK_SENTINEL;
-#endif /* CONFIG_STACK_SENTINEL */
-	/* Initialize various struct k_thread members */
-	z_init_thread_base(&thread->base, prio, _THREAD_PRESTART, options);
-
-	/* static threads overwrite it afterwards with real value */
-	thread->init_data = NULL;
-	thread->fn_abort = NULL;
-
-#ifdef CONFIG_THREAD_CUSTOM_DATA
-	/* Initialize custom data field (value is opaque to kernel) */
-	thread->custom_data = NULL;
-#endif
-
-#ifdef CONFIG_THREAD_NAME
-	thread->name[0] = '\0';
-#endif
-
-#if defined(CONFIG_USERSPACE)
-	thread->mem_domain_info.mem_domain = NULL;
-#endif /* CONFIG_USERSPACE */
-
-#if defined(CONFIG_THREAD_STACK_INFO)
-	thread->stack_info.start = (uintptr_t)pStack;
-	thread->stack_info.size = (u32_t)stackSize;
-#endif /* CONFIG_THREAD_STACK_INFO */
-}
-
 /*
  * Note:
  * The caller must guarantee that the stack_size passed here corresponds
@@ -522,6 +477,7 @@ void z_setup_new_thread(struct k_thread *new_thread,
 	z_object_init(new_thread);
 	z_object_init(stack);
 	new_thread->stack_obj = stack;
+	new_thread->mem_domain_info.mem_domain = NULL;
 
 	/* Any given thread has access to itself */
 	k_object_access_grant(new_thread, new_thread);
@@ -537,9 +493,14 @@ void z_setup_new_thread(struct k_thread *new_thread,
 			- sizeof(*new_thread->userspace_local_data));
 #endif
 #endif
+	/* Initialize various struct k_thread members */
+	z_init_thread_base(&new_thread->base, prio, _THREAD_PRESTART, options);
 
 	arch_new_thread(new_thread, stack, stack_size, entry, p1, p2, p3,
 			  prio, options);
+	/* static threads overwrite it afterwards with real value */
+	new_thread->init_data = NULL;
+	new_thread->fn_abort = NULL;
 
 #ifdef CONFIG_USE_SWITCH
 	/* switch_handle must be non-null except when inside z_swap()
@@ -549,7 +510,13 @@ void z_setup_new_thread(struct k_thread *new_thread,
 	__ASSERT(new_thread->switch_handle != NULL,
 		 "arch layer failed to initialize switch_handle");
 #endif
-
+#ifdef CONFIG_STACK_SENTINEL
+	/* Put the stack sentinel at the lowest 4 bytes of the stack area.
+	 * We periodically check that it's still present and kill the thread
+	 * if it isn't.
+	 */
+	*((u32_t *)new_thread->stack_info.start) = STACK_SENTINEL;
+#endif /* CONFIG_STACK_SENTINEL */
 #ifdef CONFIG_THREAD_USERSPACE_LOCAL_DATA
 #ifndef CONFIG_THREAD_USERSPACE_LOCAL_DATA_ARCH_DEFER_SETUP
 	/* don't set again if the arch's own code in arch_new_thread() has
@@ -560,7 +527,10 @@ void z_setup_new_thread(struct k_thread *new_thread,
 		(Z_THREAD_STACK_BUFFER(stack) + stack_size);
 #endif
 #endif
-
+#ifdef CONFIG_THREAD_CUSTOM_DATA
+	/* Initialize custom data field (value is opaque to kernel) */
+	new_thread->custom_data = NULL;
+#endif
 #ifdef CONFIG_THREAD_MONITOR
 	new_thread->entry.pEntry = entry;
 	new_thread->entry.parameter1 = p1;
@@ -579,6 +549,8 @@ void z_setup_new_thread(struct k_thread *new_thread,
 			CONFIG_THREAD_MAX_NAME_LEN - 1);
 		/* Ensure NULL termination, truncate if longer */
 		new_thread->name[CONFIG_THREAD_MAX_NAME_LEN - 1] = '\0';
+	} else {
+		new_thread->name[0] = '\0';
 	}
 #endif
 #ifdef CONFIG_SCHED_CPU_MASK