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lwt_bpf: Replace preempt_disable() with migrate_disable()

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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
This commit is contained in:
Cong Wang
2020-12-04 23:59:46 -08:00
committed by Alexei Starovoitov
parent d9054a1ff5
commit e3366884b3
1 changed files with 3 additions and 3 deletions
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6
net/core/lwt_bpf.c
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@@ -39,10 +39,10 @@ static int run_lwt_bpf(struct sk_buff *skb, struct bpf_lwt_prog *lwt,
{
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);
@@ -78,7 +78,7 @@ static int run_lwt_bpf(struct sk_buff *skb, struct bpf_lwt_prog *lwt,
}
local_bh_enable();
preempt_enable();
migrate_enable();
return ret;
}