linux-kernel - [PATCH v2] tracepoint: Print the function symbol when tracepoint

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Message-Id: <20250307033858.4134-1-shijie@os.amperecomputing.com>
Date: Fri,  7 Mar 2025 11:38:58 +0800
From: Huang Shijie <shijie@...amperecomputing.com>
To: rostedt@...dmis.org
Cc: patches@...erecomputing.com,
	cl@...ux.com,
	yang@...amperecomputing.com,
	mathieu.desnoyers@...icios.com,
	peterz@...radead.org,
	jpoimboe@...nel.org,
	linux-kernel@...r.kernel.org,
	linux-trace-kernel@...r.kernel.org,
	Huang Shijie <shijie@...amperecomputing.com>
Subject: [PATCH v2] tracepoint: Print the function symbol when tracepoint_debug is set

When tracepoint_debug is set, we may get the output in kernel log:
     [  380.013843] Probe 0 : 00000000f0d68cda

It is not readable, so change to print the function symbol.
After this patch, the output may becomes:
     [   55.225555] Probe 0 : perf_trace_sched_wakeup_template+0x0/0x20

Signed-off-by: Huang Shijie <shijie@...amperecomputing.com>
---
v1--> v2:
     Change from "%ps" to "%pSb".

     v1(resend): https://lkml.org/lkml/2025/3/5/109

---
 kernel/tracepoint.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/tracepoint.c b/kernel/tracepoint.c
index abfd0ac1177f..3d958367f5fb 100644
--- a/kernel/tracepoint.c
+++ b/kernel/tracepoint.c
@@ -127,7 +127,7 @@ static void debug_print_probes(struct tracepoint_func *funcs)
 		return;
 
 	for (i = 0; funcs[i].func; i++)
-		printk(KERN_DEBUG "Probe %d : %p\n", i, funcs[i].func);
+		printk(KERN_DEBUG "Probe %d : %pSb\n", i, funcs[i].func);
 }
 
 static struct tracepoint_func *
-- 
2.40.1