arm64: Mark start_backtrace() notrace and NOKPROBE_SYMBOL

Mark the start_backtrace() as notrace and NOKPROBE_SYMBOL because this function is called from ftrace and lockdep to get the caller address via return_address(). The lockdep is used in kprobes, it should also be NOKPROBE_SYMBOL. Fixes: b07f349 ("arm64: stacktrace: Move start_backtrace() out of the header") Cc: <[email protected]> # 5.13.x Signed-off-by: Masami Hiramatsu <[email protected]> Reviewed-by: Mark Brown <[email protected]> Link: https://lore.kernel.org/r/164301227374.1433152.12808232644267107415.stgit@devnote2 Signed-off-by: Catalin Marinas <[email protected]>
dedewu6 · Jan 24, 2022 · 1e0924b · 1e0924b
1 parent eb30d83
commit 1e0924b
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
@@ -33,8 +33,8 @@
  */
 
 
-static void start_backtrace(struct stackframe *frame, unsigned long fp,
-			    unsigned long pc)
+static notrace void start_backtrace(struct stackframe *frame, unsigned long fp,
+				    unsigned long pc)
 {
 	frame->fp = fp;
 	frame->pc = pc;
@@ -55,6 +55,7 @@ static void start_backtrace(struct stackframe *frame, unsigned long fp,
 	frame->prev_fp = 0;
 	frame->prev_type = STACK_TYPE_UNKNOWN;
 }
+NOKPROBE_SYMBOL(start_backtrace);
 
 /*
  * Unwind from one frame record (A) to the next frame record (B).