This is a note to let you know that I've just added the patch titled
arm64: Mark start_backtrace() notrace and NOKPROBE_SYMBOL
to the 5.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-mark-start_backtrace-notrace-and-nokprobe_symb.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 9ddce6ce7e864c772bf1e1ee4b6baedebe5a5a9a
Author: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Date: Mon Jan 24 17:17:54 2022 +0900
arm64: Mark start_backtrace() notrace and NOKPROBE_SYMBOL
[ Upstream commit 1e0924bd09916fab795fc2a21ec1d148f24299fd ]
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: b07f3499661c ("arm64: stacktrace: Move start_backtrace() out of the header")
Cc: <stable@xxxxxxxxxxxxxxx> # 5.13.x
Signed-off-by: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Reviewed-by: Mark Brown <broonie@xxxxxxxxxx>
Link: https://lore.kernel.org/r/164301227374.1433152.12808232644267107415.stgit@devnote2
Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 8982a2b78acfc..3b8dc538a4c42 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -33,7 +33,7 @@
*/
-void start_backtrace(struct stackframe *frame, unsigned long fp,
+notrace void start_backtrace(struct stackframe *frame, unsigned long fp,
unsigned long pc)
{
frame->fp = fp;
@@ -55,6 +55,7 @@ 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).
