arch: Unify declaration of text region

The declaration for the text region '__text_region_start' and
'__text_region_end' should be consistent with the declaration in the
include file 'zephyr/linker/linker-defs.h'.

The local declarations are:
  extern uintptr_t __text_region_start, __text_region_end;
whereas 'linker_defs.h' declares them as:
  extern char __text_region_start[];
  extern char __text_region_end[];

This may result in conflicting types when 'linker_defs.h' is indirectly
included. Hence, remove the local declarations.

Signed-off-by: Christoph Winklhofer <cj.winklhofer@gmail.com>

arch/riscv/core/stacktrace.c

@@ -7,6 +7,7 @@
 #include <zephyr/debug/symtab.h>
 #include <zephyr/kernel.h>
 #include <zephyr/kernel_structs.h>
+#include <zephyr/linker/linker-defs.h>
 #include <kernel_internal.h>
 #include <zephyr/logging/log.h>
 
@@ -90,9 +91,7 @@ static bool in_stack_bound(uintptr_t addr, const struct k_thread *const thread,
 
 static inline bool in_text_region(uintptr_t addr)
 {
-	extern uintptr_t __text_region_start, __text_region_end;
-
-	return (addr >= (uintptr_t)&__text_region_start) && (addr < (uintptr_t)&__text_region_end);
+	return (addr >= (uintptr_t)__text_region_start) && (addr < (uintptr_t)__text_region_end);
 }
 
 #ifdef CONFIG_FRAME_POINTER

subsys/profiling/perf/backends/perf_riscv.c

@@ -5,6 +5,7 @@
  */
 
 #include <zephyr/kernel.h>
+#include <zephyr/linker/linker-defs.h>
 
 static bool valid_stack(uintptr_t addr, k_tid_t current)
 {
@@ -14,9 +15,7 @@ static bool valid_stack(uintptr_t addr, k_tid_t current)
 
 static inline bool in_text_region(uintptr_t addr)
 {
-	extern uintptr_t __text_region_start, __text_region_end;
-
-	return (addr >= (uintptr_t)&__text_region_start) && (addr < (uintptr_t)&__text_region_end);
+	return (addr >= (uintptr_t)__text_region_start) && (addr < (uintptr_t)__text_region_end);
 }
 
 /*

subsys/profiling/perf/backends/perf_x86.c

@@ -6,6 +6,7 @@
  */
 
 #include <zephyr/kernel.h>
+#include <zephyr/linker/linker-defs.h>
 
 static bool valid_stack(uintptr_t addr, k_tid_t current)
 {
@@ -15,9 +16,7 @@ static bool valid_stack(uintptr_t addr, k_tid_t current)
 
 static inline bool in_text_region(uintptr_t addr)
 {
-	extern uintptr_t __text_region_start, __text_region_end;
-
-	return (addr >= (uintptr_t)&__text_region_start) && (addr < (uintptr_t)&__text_region_end);
+	return (addr >= (uintptr_t)__text_region_start) && (addr < (uintptr_t)__text_region_end);
 }
 
 /* interruption stack frame */

subsys/profiling/perf/backends/perf_x86_64.c

@@ -6,6 +6,7 @@
  */
 
 #include <zephyr/kernel.h>
+#include <zephyr/linker/linker-defs.h>
 
 static bool valid_stack(uintptr_t addr, k_tid_t current)
 {
@@ -15,9 +16,7 @@ static bool valid_stack(uintptr_t addr, k_tid_t current)
 
 static inline bool in_text_region(uintptr_t addr)
 {
-	extern uintptr_t __text_region_start, __text_region_end;
-
-	return (addr >= (uintptr_t)&__text_region_start) && (addr < (uintptr_t)&__text_region_end);
+	return (addr >= (uintptr_t)__text_region_start) && (addr < (uintptr_t)__text_region_end);
 }
 
 /*