netdev - [tip: core/rcu] bpf/cgroup: Replace rcu_swap_protected() with rcu_replace

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Date:   Thu, 31 Oct 2019 11:54:54 -0000
From:   "tip-bot2 for Paul E. McKenney" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Linus Torvalds <torvalds@...ux-foundation.org>,
        "Paul E. McKenney" <paulmck@...nel.org>,
        Andrii Nakryiko <andriin@...com>,
        Song Liu <songliubraving@...com>,
        Alexei Starovoitov <ast@...nel.org>,
        Daniel Borkmann <daniel@...earbox.net>,
        Martin KaFai Lau <kafai@...com>, Yonghong Song <yhs@...com>,
        <netdev@...r.kernel.org>, <bpf@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>, Borislav Petkov <bp@...en8.de>,
        linux-kernel@...r.kernel.org
Subject: [tip: core/rcu] bpf/cgroup: Replace rcu_swap_protected() with
 rcu_replace_pointer()

The following commit has been merged into the core/rcu branch of tip:

Commit-ID:     6092f7263f7e56dacf72e383ed7ba9cbabec30e5
Gitweb:        https://git.kernel.org/tip/6092f7263f7e56dacf72e383ed7ba9cbabec30e5
Author:        Paul E. McKenney <paulmck@...nel.org>
AuthorDate:    Mon, 23 Sep 2019 15:37:04 -07:00
Committer:     Paul E. McKenney <paulmck@...nel.org>
CommitterDate: Wed, 30 Oct 2019 08:45:14 -07:00

bpf/cgroup: Replace rcu_swap_protected() with rcu_replace_pointer()

This commit replaces the use of rcu_swap_protected() with the more
intuitively appealing rcu_replace_pointer() as a step towards removing
rcu_swap_protected().

Link: https://lore.kernel.org/lkml/CAHk-=wiAsJLw1egFEE=Z7-GGtM6wcvtyytXZA1+BHqta4gg6Hw@mail.gmail.com/
Reported-by: Linus Torvalds <torvalds@...ux-foundation.org>
[ paulmck: From rcu_replace() to rcu_replace_pointer() per Ingo Molnar. ]
Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Acked-by: Andrii Nakryiko <andriin@...com>
Acked-by: Song Liu <songliubraving@...com>
Cc: Alexei Starovoitov <ast@...nel.org>
Cc: Daniel Borkmann <daniel@...earbox.net>
Cc: Martin KaFai Lau <kafai@...com>
Cc: Yonghong Song <yhs@...com>
Cc: <netdev@...r.kernel.org>
Cc: <bpf@...r.kernel.org>
---
 kernel/bpf/cgroup.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/bpf/cgroup.c b/kernel/bpf/cgroup.c
index ddd8add..c684cf4 100644
--- a/kernel/bpf/cgroup.c
+++ b/kernel/bpf/cgroup.c
@@ -180,8 +180,8 @@ static void activate_effective_progs(struct cgroup *cgrp,
 				     enum bpf_attach_type type,
 				     struct bpf_prog_array *old_array)
 {
-	rcu_swap_protected(cgrp->bpf.effective[type], old_array,
-			   lockdep_is_held(&cgroup_mutex));
+	old_array = rcu_replace_pointer(cgrp->bpf.effective[type], old_array,
+					lockdep_is_held(&cgroup_mutex));
 	/* free prog array after grace period, since __cgroup_bpf_run_*()
 	 * might be still walking the array
 	 */