From: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Wed, 8 Jan 2025 10:04:54 +0100
Subject: [PATCH 25/28] bpf: Use RCU in all users of __module_text_address().

__module_address() can be invoked within a RCU section, there is no
requirement to have preemption disabled.

Replace the preempt_disable() section around __module_address() with
RCU.

Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Andrii Nakryiko <andrii@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Eduard Zingerman <eddyz87@gmail.com>
Cc: Hao Luo <haoluo@google.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Fastabend <john.fastabend@gmail.com>
Cc: KP Singh <kpsingh@kernel.org>
Cc: Martin KaFai Lau <martin.lau@linux.dev>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Matt Bobrowski <mattbobrowski@google.com>
Cc: Song Liu <song@kernel.org>
Cc: Stanislav Fomichev <sdf@fomichev.me>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: bpf@vger.kernel.org
Cc: linux-trace-kernel@vger.kernel.org
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/all/20250129084751.tH6iidUO@linutronix.de
Acked-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
---
 kernel/trace/bpf_trace.c |   24 +++++++++++++-----------
 1 file changed, 13 insertions(+), 11 deletions(-)

@ kernel/trace/bpf_trace.c:2348 @ void bpf_put_raw_tracepoint(struct bpf_r
 {
 	struct module *mod;
 
-	preempt_disable();
+	guard(rcu)();
 	mod = __module_address((unsigned long)btp);
 	module_put(mod);
-	preempt_enable();
 }
 
 static __always_inline
@ kernel/trace/bpf_trace.c:2934 @ static int get_modules_for_addrs(struct
 	u32 i, err = 0;
 
 	for (i = 0; i < addrs_cnt; i++) {
+		bool skip_add = false;
 		struct module *mod;
 
-		preempt_disable();
-		mod = __module_address(addrs[i]);
-		/* Either no module or we it's already stored  */
-		if (!mod || has_module(&arr, mod)) {
-			preempt_enable();
-			continue;
+		scoped_guard(rcu) {
+			mod = __module_address(addrs[i]);
+			/* Either no module or it's already stored  */
+			if (!mod || has_module(&arr, mod)) {
+				skip_add = true;
+				break; /* scoped_guard */
+			}
+			if (!try_module_get(mod))
+				err = -EINVAL;
 		}
-		if (!try_module_get(mod))
-			err = -EINVAL;
-		preempt_enable();
+		if (skip_add)
+			continue;
 		if (err)
 			break;
 		err = add_module(&arr, mod);