kernel/include: Put kernel stack memory in the right memory

The CONFIG_KERNEL_COHERENCE framework merged with a typo that left its
validation asserts disabled.  But it was written before the "kernel
stacks" feature merged, and so missed the K_KERNEL_STACK_* macros,
which need to put their stacks into __stackmem and not merely
__noinit.

Turning the asserts on exposed the bug.

Fixes #32112

Signed-off-by: Andy Ross <[email protected]>

Author: Andy Ross

include/linker/section_tags.h

@@ -44,9 +44,11 @@
 #if defined(CONFIG_KERNEL_COHERENCE)
 #define __incoherent __in_section_unique(cached)
 #define __stackmem __incoherent
+#define __kstackmem __stackmem
 #else
-#define __incoherent Z_GENERIC_SECTION(.user_stacks)
-#define __stackmem __incoherent
+#define __incoherent
+#define __stackmem Z_GENERIC_SECTION(.user_stacks)
+#define __kstackmem __noinit
 #endif /* CONFIG_KERNEL_COHERENCE */
 
 #endif /* !_ASMLANGUAGE */

include/sys/thread_stack.h

@@ -134,7 +134,7 @@ static inline char *z_stack_ptr_align(char *ptr)
  * @param size Size of the stack memory region
  */
 #define K_KERNEL_STACK_DEFINE(sym, size) \
-	struct z_thread_stack_element __noinit \
+	struct z_thread_stack_element __kstackmem \
 		__aligned(Z_KERNEL_STACK_OBJ_ALIGN) \
 		sym[Z_KERNEL_STACK_SIZE_ADJUST(size)]
 
@@ -152,7 +152,7 @@ static inline char *z_stack_ptr_align(char *ptr)
  * @param size Size of the stack memory region
  */
 #define K_KERNEL_STACK_ARRAY_DEFINE(sym, nmemb, size) \
-	struct z_thread_stack_element __noinit \
+	struct z_thread_stack_element __kstackmem \
 		__aligned(Z_KERNEL_STACK_OBJ_ALIGN) \
 		sym[nmemb][Z_KERNEL_STACK_LEN(size)]