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

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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@linux-foundation.org>
[ paulmck: From rcu_replace() to rcu_replace_pointer() per Ingo Molnar. ]
Change-Id: I49e16f57052bd11695036615d36bcd5ec6f20266
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Song Liu <songliubraving@fb.com>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Martin KaFai Lau <kafai@fb.com>
Cc: Yonghong Song <yhs@fb.com>
Cc: <netdev@vger.kernel.org>
Cc: <bpf@vger.kernel.org>
This commit is contained in:
Paul E. McKenney 2019-09-23 15:37:04 -07:00 • committed by basamaryan
commit 1c4e2fa042
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GPG key ID: 210D5384FB2A5885
1 changed files with 2 additions and 2 deletions
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4
kernel/bpf/cgroup.c
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@ -183,8 +183,8 @@ 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
*/