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arm64: Mark start_backtrace() notrace and NOKPROBE_SYMBOL

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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: b07f349966 ("arm64: stacktrace: Move start_backtrace() out of the header")
Cc: <stable@vger.kernel.org> # 5.13.x
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Reviewed-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/164301227374.1433152.12808232644267107415.stgit@devnote2
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Masami Hiramatsu 2022-01-24 17:17:54 +09:00 committed by Catalin Marinas
parent eb30d838a4
commit 1e0924bd09
1 changed files with 3 additions and 2 deletions
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5
arch/arm64/kernel/stacktrace.c
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@ -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).