Re: [hnaz-mm:master 29/122] arch/arm64/kernel/stacktrace.c:289:13: error: implicit declaration of function 'task_scs' is invalid in C99

[Andrew Morton]

On Thu, 31 Mar 2022 20:59:49 +0800 kernel test robot <lkp@xxxxxxxxx> wrote:

> >> arch/arm64/kernel/stacktrace.c:289:13: error: implicit declaration of function 'task_scs' is invalid in C99 [-Werror,-Wimplicit-function-declaration]
>            scs_base = task_scs(current);
>                       ^

Thanks.   Presumably this:

--- a/arch/arm64/kernel/stacktrace.c~arm64-implement-stack_trace_save_shadow-fix
+++ a/arch/arm64/kernel/stacktrace.c
@@ -213,6 +213,7 @@ noinline notrace void arch_stack_walk(st
 	walk_stackframe(task, &frame, consume_entry, cookie);
 }
 
+#ifdef CONFIG_SHADOW_CALL_STACK
 static const struct {
 	unsigned long ** __percpu saved;
 	unsigned long ** __percpu base;
@@ -293,3 +294,4 @@ out:
 	preempt_enable();
 	return len;
 }
+#endif		/* CONFIG_SHADOW_CALL_STACK */
_