Re: [PATCH RT] net: move xmit_recursion to per-task variable on -RT

[Hannes Frederic Sowa]

On 14.01.2016 23:20, Eric Dumazet wrote:
> On Thu, 2016-01-14 at 23:02 +0100, Hannes Frederic Sowa wrote:
>
> > We are just adding a second recursion limit solely to openvswitch which
> > has the same problem:
> >
> > https://patchwork.ozlabs.org/patch/566769/
> >
> > This time also we depend on rcu_read_lock marking the section being
> > nonpreemptible. Nice would be a more generic solution here which doesn't
> > need to always add something to *current.
>
>
> Note that rcu_read_lock() does not imply that preemption is disabled.

Exactly, it is conditional on CONFIG_PREEMPT_CPU/CONFIG_PREMPT_COUNT but 
haven't thought about exactly that in this moment.

I will resend this patch with better protection.

Thanks Eric!