aboutsummaryrefslogtreecommitdiffstats
path: root/kernel/bpf/reuseport_array.c
diff options
context:
space:
mode:
authorAlexei Starovoitov <ast@kernel.org>2020-06-29 21:33:39 -0700
committerAlexei Starovoitov <ast@kernel.org>2020-07-01 08:07:13 -0700
commitbba1dc0b55ac462d24ed1228ad49800c238cd6d7 (patch)
treed83554930260fe70393ea2d74734357577035dce /kernel/bpf/reuseport_array.c
parentselftests/bpf: Add byte swapping selftest (diff)
downloadlinux-dev-bba1dc0b55ac462d24ed1228ad49800c238cd6d7.tar.xz
linux-dev-bba1dc0b55ac462d24ed1228ad49800c238cd6d7.zip
bpf: Remove redundant synchronize_rcu.
bpf_free_used_maps() or close(map_fd) will trigger map_free callback. bpf_free_used_maps() is called after bpf prog is no longer executing: bpf_prog_put->call_rcu->bpf_prog_free->bpf_free_used_maps. Hence there is no need to call synchronize_rcu() to protect map elements. Note that hash_of_maps and array_of_maps update/delete inner maps via sys_bpf() that calls maybe_wait_bpf_programs() and synchronize_rcu(). Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Acked-by: Paul E. McKenney <paulmck@kernel.org> Link: https://lore.kernel.org/bpf/20200630043343.53195-2-alexei.starovoitov@gmail.com
Diffstat (limited to 'kernel/bpf/reuseport_array.c')
-rw-r--r--kernel/bpf/reuseport_array.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/kernel/bpf/reuseport_array.c b/kernel/bpf/reuseport_array.c
index a09922f656e4..3625c4fcc65c 100644
--- a/kernel/bpf/reuseport_array.c
+++ b/kernel/bpf/reuseport_array.c
@@ -96,8 +96,6 @@ static void reuseport_array_free(struct bpf_map *map)
struct sock *sk;
u32 i;
- synchronize_rcu();
-
/*
* ops->map_*_elem() will not be able to access this
* array now. Hence, this function only races with