Subject: Re: [PATCH v13 1/7] net: split off __napi_busy_poll from napi_busy_poll

From: Jakub Kicinski <[email-masked]>
Date: Thu, 1 Jun 2023 21:26:04 -0700

On Thu, 01 Jun 2023 21:12:10 -0700 Stefan Roesch wrote:
> The problem with checking need_resched in loop_end is that need_resched
> can be false in loop_end, however the check for need_resched in
> napi_busy_loop succeeds. This means that we unlock the rcu read lock and
> call schedule. However the code in io_napi_blocking_busy_loop still
> believes we hold the read lock.

Ah, yes, now it makes sense. 
Yeah, that's a race, scratch the workaround idea then.
Let's work on revising the patches, we'll see where we 
are in the development process when they're ready.