netdev - Re: [PATCH net-next 1/2] net: add a napi variant for RT-well-behaved drivers

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Date:   Fri, 14 May 2021 17:21:57 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     Thomas Gleixner <tglx@...utronix.de>
Cc:     davem@...emloft.net, netdev@...r.kernel.org,
        eric.dumazet@...il.com, simon.horman@...ronome.com,
        oss-drivers@...ronome.com, bigeasy@...utronix.de
Subject: Re: [PATCH net-next 1/2] net: add a napi variant for
 RT-well-behaved drivers

On Sat, 15 May 2021 02:17:50 +0200 Thomas Gleixner wrote:
> On Fri, May 14 2021 at 15:24, Jakub Kicinski wrote:
> >  
> > +void __napi_schedule_irq(struct napi_struct *n)
> > +{
> > +	____napi_schedule(this_cpu_ptr(&softnet_data), n);  
> 
> Not that I have any clue, but why does this not need the
> napi_schedule_prep() check?

napi_schedule_prep() is in the non-__ version in linux/netdevice.h:

static inline void napi_schedule_irq(struct napi_struct *n)
{
	if (napi_schedule_prep(n))
		__napi_schedule_irq(n);
}