[PATCH v2] xen/arm: traps: Fix MISRA C 2012 Rule 8.4 violation

[Xenia Ragiadakou <burzalodowa@gmail.com>]

Add the function prototype of show_stack() in <asm/processor.h> header file
so that it is visible before its definition in traps.c.

Although show_stack() is referenced only in traps.c, it is declared with
external linkage because, during development, it is often called also by
other files for debugging purposes. Declaring it static would increase
development effort. Add appropriate comment

Signed-off-by: Xenia Ragiadakou <burzalodowa@gmail.com>
---
Changes in v2:
- add a new line after show_stack() to make obvious to which set of functions
the comment is referring to.

 xen/arch/arm/include/asm/processor.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xen/arch/arm/include/asm/processor.h b/xen/arch/arm/include/asm/processor.h
index 4188ec6bfb..55f56b33bc 100644
--- a/xen/arch/arm/include/asm/processor.h
+++ b/xen/arch/arm/include/asm/processor.h
@@ -558,7 +558,10 @@ extern register_t __cpu_logical_map[];
 void panic_PAR(uint64_t par);
 
 void show_execution_state(const struct cpu_user_regs *regs);
+/* Debugging functions are declared with external linkage to aid development. */
 void show_registers(const struct cpu_user_regs *regs);
+void show_stack(const struct cpu_user_regs *regs);
+
 //#define dump_execution_state() run_in_exception_handler(show_execution_state)
 #define dump_execution_state() WARN()
 
-- 
2.34.1