[PATCH 03/14 v2] arm64: function_graph: Remove use of FTRACE_NOTRACE_DEPTH

From: Steven Rostedt
Date: Wed Dec 05 2018 - 16:50:09 EST


From: "Steven Rostedt (VMware)" <rostedt@xxxxxxxxxxx>

Functions in the set_graph_notrace no longer subtract FTRACE_NOTRACE_DEPTH
from curr_ret_stack, as that is now implemented via the trace_recursion
flags. Access to curr_ret_stack no longer needs to worry about checking for
this. curr_ret_stack is still initialized to -1, when there's not a shadow
stack allocated.

Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: linux-arm-kernel@xxxxxxxxxxxxxxxxxxx
Reviewed-by: Joel Fernandes (Google) <joel@xxxxxxxxxxxxxxxxx>
Signed-off-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>
---

Changes since v1: A better change log. The patch itself is the same.

arch/arm64/kernel/stacktrace.c | 3 ---
1 file changed, 3 deletions(-)

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index 4989f7ea1e59..7723dadf25be 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -61,9 +61,6 @@ int notrace unwind_frame(struct task_struct *tsk, struct stackframe *frame)
(frame->pc == (unsigned long)return_to_handler)) {
if (WARN_ON_ONCE(frame->graph == -1))
return -EINVAL;
- if (frame->graph < -1)
- frame->graph += FTRACE_NOTRACE_DEPTH;
-
/*
* This is a case where function graph tracer has
* modified a return address (LR) in a stack frame
--
2.19.1