linux-kernel - [PATCH v2 03/14] tracing: Rename kvfree_rcu() to kvfree_rcu

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Date:   Wed, 15 Mar 2023 18:18:50 +0000
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Daniel Bristot de Oliveira <bristot@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>
Cc:     "Uladzislau Rezki (Sony)" <urezki@...il.com>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Joel Fernandes <joel@...lfernandes.org>,
        linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org
Subject: [PATCH v2 03/14] tracing: Rename kvfree_rcu() to kvfree_rcu_mightsleep()

From: "Uladzislau Rezki (Sony)" <urezki@...il.com>

The kvfree_rcu() macro's single-argument form is deprecated.  Therefore
switch to the new kvfree_rcu_mightsleep() variant. The goal is to
avoid accidental use of the single-argument forms, which can introduce
functionality bugs in atomic contexts and latency bugs in non-atomic
contexts.

Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 kernel/trace/trace_osnoise.c | 2 +-
 kernel/trace/trace_probe.c   | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 04f0fdae19a1..f68ca1e6460f 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -159,7 +159,7 @@ static void osnoise_unregister_instance(struct trace_array *tr)
 	if (!found)
 		return;
 
-	kvfree_rcu(inst);
+	kvfree_rcu_mightsleep(inst);
 }
 
 /*
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 20d0c4a97633..2d2616678295 100644
--- a/kernel/trace/trace_probe.c
+++ b/kernel/trace/trace_probe.c
@@ -1172,7 +1172,7 @@ int trace_probe_remove_file(struct trace_probe *tp,
 		return -ENOENT;
 
 	list_del_rcu(&link->list);
-	kvfree_rcu(link);
+	kvfree_rcu_mightsleep(link);
 
 	if (list_empty(&tp->event->files))
 		trace_probe_clear_flag(tp, TP_FLAG_TRACE);
-- 
2.40.0.rc1.284.g88254d51c5-goog