linux-kernel - Re: [PATCH 04/13] tracing: Rename kvfree_rcu() to kvfree_rcu

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Date:   Wed, 15 Mar 2023 18:36:48 -0400
From:   Steven Rostedt <rostedt@...dmis.org>
To:     Uladzislau Rezki <urezki@...il.com>
Cc:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Jens Axboe <axboe@...nel.dk>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Bryan Tan <bryantan@...are.com>,
        Eric Dumazet <edumazet@...gle.com>,
        Bob Pearson <rpearsonhpe@...il.com>,
        Ariel Levkovich <lariel@...dia.com>,
        Theodore Ts'o <tytso@....edu>, Julian Anastasov <ja@....bg>
Subject: Re: [PATCH 04/13] tracing: Rename kvfree_rcu() to
 kvfree_rcu_mightsleep()

On Thu, 9 Mar 2023 14:45:21 +0100
Uladzislau Rezki <urezki@...il.com> wrote:

> > The kvfree_rcu()'s single argument name is deprecated therefore
> > rename it to kvfree_rcu_mightsleep() variant. The goal is explicitly
> > underline that it is for sleepable contexts.
> > 
> > Cc: Steven Rostedt (VMware) <rostedt@...dmis.org>
> > Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
> >  
> Could you please add you reviwed-by or Acked-by tags so we can bring
> our series with renaming for the next merge window?

I don't know. Perhaps we should just apply this patch and not worry about
sleeping and whatnot.

-- Steve

diff --git a/kernel/trace/trace_osnoise.c b/kernel/trace/trace_osnoise.c
index 04f0fdae19a1..5de945a8f61d 100644
--- a/kernel/trace/trace_osnoise.c
+++ b/kernel/trace/trace_osnoise.c
@@ -76,6 +76,7 @@ static unsigned long osnoise_options	= OSN_DEFAULT_OPTIONS;
 struct osnoise_instance {
 	struct list_head	list;
 	struct trace_array	*tr;
+	struct rcu_head		rcu;
 };
 
 static struct list_head osnoise_instances;
@@ -159,7 +160,7 @@ static void osnoise_unregister_instance(struct trace_array *tr)
 	if (!found)
 		return;
 
-	kvfree_rcu(inst);
+	kvfree_rcu(inst, rcu);
 }
 
 /*
diff --git a/kernel/trace/trace_probe.c b/kernel/trace/trace_probe.c
index 20d0c4a97633..ef5fafb40c76 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(link, rcu);
 
 	if (list_empty(&tp->event->files))
 		trace_probe_clear_flag(tp, TP_FLAG_TRACE);
diff --git a/kernel/trace/trace_probe.h b/kernel/trace/trace_probe.h
index ef8ed3b65d05..e6037752dcf0 100644
--- a/kernel/trace/trace_probe.h
+++ b/kernel/trace/trace_probe.h
@@ -256,6 +256,7 @@ struct trace_probe {
 struct event_file_link {
 	struct trace_event_file		*file;
 	struct list_head		list;
+	struct rcu_head			rcu;
 };
 
 static inline bool trace_probe_test_flag(struct trace_probe *tp,