linux-kernel - [PATCH 1/2] riscv: ftrace: correct the condition logic in function graph tracer

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Date:   Mon, 23 Dec 2019 16:46:13 +0800
From:   Zong Li <zong.li@...ive.com>
To:     paul.walmsley@...ive.com, palmer@...belt.com, rostedt@...dmis.org,
        anup@...infault.org, linux-kernel@...r.kernel.org,
        linux-riscv@...ts.infradead.org
Cc:     Zong Li <zong.li@...ive.com>
Subject: [PATCH 1/2] riscv: ftrace: correct the condition logic in function graph tracer

The condition should be logical NOT to assign the hook address to parent
address. Because the return value 0 of function_graph_enter upon
success.

Fixes: e949b6db51dc (riscv/function_graph: Simplify with function_graph_enter())

Signed-off-by: Zong Li <zong.li@...ive.com>
---
 arch/riscv/kernel/ftrace.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/riscv/kernel/ftrace.c b/arch/riscv/kernel/ftrace.c
index b94d8db5ddcc..c40fdcdeb950 100644
--- a/arch/riscv/kernel/ftrace.c
+++ b/arch/riscv/kernel/ftrace.c
@@ -142,7 +142,7 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
 	 */
 	old = *parent;
 
-	if (function_graph_enter(old, self_addr, frame_pointer, parent))
+	if (!function_graph_enter(old, self_addr, frame_pointer, parent))
 		*parent = return_hooker;
 }
 
-- 
2.24.1