linux-kernel - Re: [PATCH] tracepoints: Use new static branch API

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Message-ID: <20241007182521.xtlduygupnt6wnfa@treble>
Date: Mon, 7 Oct 2024 11:25:21 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Masami Hiramatsu <mhiramat@...nel.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	Alice Ryhl <aliceryhl@...gle.com>
Subject: Re: [PATCH] tracepoints: Use new static branch API

On Tue, Oct 01, 2024 at 03:24:01PM -0700, Josh Poimboeuf wrote:
> The old static key API based on 'struct static_key' is deprecated.
> Convert tracepoints to use the new API.
> 
> Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>

Steven,

The kernel test robot found this patch breaks the build with
CONFIG_HIST_TRIGGERS:

  https://lore.kernel.org/202410040333.vJSL1NXx-lkp@intel.com

Here's the fix, do you want to squash it in or should I post a v2?

diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c
index 5f9119eb7c67..cc2924ad32a3 100644
--- a/kernel/trace/trace_events_hist.c
+++ b/kernel/trace/trace_events_hist.c
@@ -822,7 +822,7 @@ static inline void trace_synth(struct synth_event *event, u64 *var_ref_vals,
 {
 	struct tracepoint *tp = event->tp;
 
-	if (unlikely(atomic_read(&tp->key.enabled) > 0)) {
+	if (unlikely(static_key_enabled(&tp->key))) {
 		struct tracepoint_func *probe_func_ptr;
 		synth_probe_func_t probe_func;
 		void *__data;