Re: [PATCH] net: hsr: avoid synchronize_net() in hsr_del_port() under rtnl_mutex

[Shardul Bankar]

On Fri, 2026-04-17 at 11:18 -0700, Eric Dumazet wrote:
> On Fri, Apr 17, 2026 at 10:53 AM Shardul Bankar
> <shardulsb08@xxxxxxxxx> wrote:
> > 
> 
>  synchronize_rcu_expedited() should be quite fast...

Confirmed.  I ran a targeted HSR-only teardown stress on current
mainline (many HSR-bearing netns torn down concurrently, no WireGuard,
no syzkaller harness).  At N=1000, patched-vs-baseline cleanup_net
wall time is within run-to-run noise- the patch has no measurable
benefit on the workload it was meant to address.


> Signature looks like bug fixed recently in wireguard.
> 
> commit 60a25ef8dacb3566b1a8c4de00572a498e2a3bf9

Agreed.  60a25ef8dacb covers what I was actually observing, and
standalone evidence for the HSR path on current mainline is not
strong enough to justify this change.

Please drop this patch.

Thanks,
Shardul