linux-kernel - [PATCH] ftrace: mark get_lock_parent_ip() __always

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Message-Id: <20230327173647.1690849-1-john@metanate.com>
Date:   Mon, 27 Mar 2023 18:36:46 +0100
From:   John Keeping <john@...anate.com>
To:     linux-trace-kernel@...r.kernel.org
Cc:     John Keeping <john@...anate.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        linux-kernel@...r.kernel.org
Subject: [PATCH] ftrace: mark get_lock_parent_ip() __always_inline

If the compiler decides not to inline this function then preemption
tracing will always show an IP inside the preemption disabling path and
never the function actually calling preempt_{enable,disable}.

Signed-off-by: John Keeping <john@...anate.com>
---
 include/linux/ftrace.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/ftrace.h b/include/linux/ftrace.h
index 327046f1278d..6954e4ed5bbf 100644
--- a/include/linux/ftrace.h
+++ b/include/linux/ftrace.h
@@ -964,7 +964,7 @@ static inline void __ftrace_enabled_restore(int enabled)
 #define CALLER_ADDR5 ((unsigned long)ftrace_return_address(5))
 #define CALLER_ADDR6 ((unsigned long)ftrace_return_address(6))
 
-static inline unsigned long get_lock_parent_ip(void)
+static __always_inline unsigned long get_lock_parent_ip(void)
 {
 	unsigned long addr = CALLER_ADDR0;
 
-- 
2.40.0