migrate_disable() is just a wrapper for preempt_disable() in
non-RT kernel. It is safe to replace it, and RT kernel will
benefit.
Note that it is introduced since Feb 2020.
Suggested-by: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Signed-off-by: Cong Wang <cong.wang@bytedance.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20201205075946.497763-2-xiyou.wangcong@gmail.com
{
int ret;
- /* Preempt disable and BH disable are needed to protect per-cpu
+ /* Migration disable and BH disable are needed to protect per-cpu
* redirect_info between BPF prog and skb_do_redirect().
*/
- preempt_disable();
+ migrate_disable();
local_bh_disable();
bpf_compute_data_pointers(skb);
ret = bpf_prog_run_save_cb(lwt->prog, skb);
}
local_bh_enable();
- preempt_enable();
+ migrate_enable();
return ret;
}