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bpf: remove unnecessary rcu_read_{lock,unlock}() in multi-uprobe attach logic

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get_pid_task() internally already calls rcu_read_lock() and
rcu_read_unlock(), so there is no point to do this one extra time.

This is a drive-by improvement and has no correctness implications.

Acked-by: Jiri Olsa <jolsa@kernel.org>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/r/20240521163401.3005045-3-andrii@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Andrii Nakryiko 2024-05-21 09:33:58 -07:00 committed by Alexei Starovoitov
parent 46ba0e49b6
commit 4a8f635a60
1 changed files with 0 additions and 2 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
kernel/trace/bpf_trace.c
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@ -3423,9 +3423,7 @@ int bpf_uprobe_multi_link_attach(const union bpf_attr *attr, struct bpf_prog *pr
}
if (pid) {
rcu_read_lock();
task = get_pid_task(find_vpid(pid), PIDTYPE_TGID);
rcu_read_unlock();
if (!task) {
err = -ESRCH;
goto error_path_put;