linux-kernel - [PATCH 01/13] rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu

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Date:   Wed,  1 Feb 2023 16:08:07 +0100
From:   "Uladzislau Rezki (Sony)" <urezki@...il.com>
To:     LKML <linux-kernel@...r.kernel.org>, RCU <rcu@...r.kernel.org>,
        "Paul E . McKenney" <paulmck@...nel.org>
Cc:     Uladzislau Rezki <urezki@...il.com>,
        Oleksiy Avramchenko <oleksiy.avramchenko@...y.com>,
        Jens Axboe <axboe@...nel.dk>,
        Philipp Reisner <philipp.reisner@...bit.com>,
        Bryan Tan <bryantan@...are.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        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: [PATCH 01/13] rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu_mightsleep()

These two macroses will replace single-argument k[v]free_rcu() ones.
By adding an extra _mightsleep prefix we can avoid of situations when
someone intended to give a second argument but forgot to do it in a
code where sleeping is illegal.

Signed-off-by: Uladzislau Rezki (Sony) <urezki@...il.com>
---
 include/linux/rcupdate.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 822ff7b4bb1e..094321c17e48 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -1013,6 +1013,9 @@ static inline notrace void rcu_read_unlock_sched_notrace(void)
 #define kvfree_rcu(...) KVFREE_GET_MACRO(__VA_ARGS__,		\
 	kvfree_rcu_arg_2, kvfree_rcu_arg_1)(__VA_ARGS__)
 
+#define kvfree_rcu_mightsleep(ptr) kvfree_rcu_arg_1(ptr)
+#define kfree_rcu_mightsleep(ptr) kvfree_rcu_mightsleep(ptr)
+
 #define KVFREE_GET_MACRO(_1, _2, NAME, ...) NAME
 #define kvfree_rcu_arg_2(ptr, rhf)					\
 do {									\
-- 
2.30.2