Re: [RFC 2/2] mt76: make frag_cache global per cpu structure

[Stanislaw Gruszka <sgruszka@redhat.com>]

On Wed, Oct 03, 2018 at 11:38:54AM +0200, Lorenzo Bianconi wrote:
> > +static DEFINE_PER_CPU(struct page_frag_cache, mt76_frag_cache);
> > +
> > +void *mt76_alloc_frag(unsigned int fragsz)
> > +{
> > +	struct page_frag_cache *fc;
> > +	unsigned long flags;
> > +	void *data;
> > +
> > +	local_irq_save(flags);
> 
> I like this approach since we will avoid a cache miss for the spinlock :)
> Do we still need to disable local_irq here since (not considering fw upload)
> I guess there is no contention for mt76_frag_cache

I think is needed if we have more than one device, but I think we can
change to local_irq_disable() / local_irq_enable() . 

Thanks
Stanislaw