From: Uladzislau Rezki (Sony) Date: Wed, 1 Feb 2023 15:08:07 +0000 (+0100) Subject: rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu_mightsleep() X-Git-Tag: v5.15.183~49 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=1b199a17b7443f36dd2b7753fe3e677011286c69;p=thirdparty%2Fkernel%2Fstable.git rcu/kvfree: Add kvfree_rcu_mightsleep() and kfree_rcu_mightsleep() [ Upstream commit 608723c41cd951fb32ade2f8371e61c270816175 ] The kvfree_rcu() and kfree_rcu() APIs are hazardous in that if you forget the second argument, it works, but might sleep. This sleeping can be a correctness bug from atomic contexts, and even in non-atomic contexts it might introduce unacceptable latencies. This commit therefore adds kvfree_rcu_mightsleep() and kfree_rcu_mightsleep(), which will replace the single-argument kvfree_rcu() and kfree_rcu(), respectively. This commit enables a series of commits that switch from single-argument kvfree_rcu() and kfree_rcu() to their _mightsleep() counterparts. Once all of these commits land, the single-argument versions will be removed. Signed-off-by: Uladzislau Rezki (Sony) Signed-off-by: Paul E. McKenney Stable-dep-of: 511e64e13d8c ("can: gw: fix RCU/BH usage in cgw_create_job()") Signed-off-by: Sasha Levin --- diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h index d908af5917339..978769e545b5f 100644 --- a/include/linux/rcupdate.h +++ b/include/linux/rcupdate.h @@ -979,6 +979,9 @@ 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 { \