linux-kernel - Re: [RFC PATCH 0/2] net: threadable napi poll loop

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Message-ID: <1463086179.23934.162.camel@edumazet-glaptop3.roam.corp.google.com>
Date:	Thu, 12 May 2016 13:49:39 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Paolo Abeni <pabeni@...hat.com>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Eric Dumazet <edumazet@...gle.com>,
	netdev <netdev@...r.kernel.org>,
	"David S. Miller" <davem@...emloft.net>,
	Jiri Pirko <jiri@...lanox.com>,
	Daniel Borkmann <daniel@...earbox.net>,
	Alexei Starovoitov <ast@...mgrid.com>,
	Alexander Duyck <aduyck@...antis.com>,
	Tom Herbert <tom@...bertland.com>,
	Ingo Molnar <mingo@...nel.org>, Rik van Riel <riel@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [RFC PATCH 0/2] net: threadable napi poll loop

On Thu, 2016-05-12 at 22:07 +0200, Paolo Abeni wrote:

> > > static inline bool ksoftirqd_running(void)
> > > {
> > > 	return __this_cpu_read(ksoftirqd)->state == TASK_RUNNING;
> 
> here something like:
> 
> 	struct task_struct *tsk = __this_cpu_read(ksoftirqd);
>         return tsk && (tsk->state == TASK_RUNNING);
> 
> is needed since __this_cpu_read(ksoftirqd) can be NULL on boot.

Indeed I've seen this but only when backporting to an older linux kernel
this morning.

Have you got this with current linux kernel ?