netdev - Re: [net-next 2/6] i40e: prefetch struct page of Rx buffer conditionally

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Date:   Wed, 29 Jul 2020 14:20:03 -0700
From:   Jakub Kicinski <kuba@...nel.org>
To:     "Li,Rongqing" <lirongqing@...du.com>
Cc:     Tony Nguyen <anthony.l.nguyen@...el.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "nhorman@...hat.com" <nhorman@...hat.com>,
        "sassmann@...hat.com" <sassmann@...hat.com>,
        "jeffrey.t.kirsher@...el.com" <jeffrey.t.kirsher@...el.com>,
        Andrew Bowers <andrewx.bowers@...el.com>
Subject: Re: [net-next 2/6] i40e: prefetch struct page of Rx buffer
 conditionally

On Wed, 29 Jul 2020 06:20:47 +0000 Li,Rongqing wrote:
> > Looks like something that belongs in a common header not (potentially
> > multiple) C sources.  
> 
> Not clear, how should I change?

Can you add something like:

static inline void prefetch_page_address(struct page *page)
{
#if defined(WANT_PAGE_VIRTUAL) || defined(HASHED_PAGE_VIRTUAL)
	prefetch(page);
#endif
}

to mm.h or prefetch.h or i40e.h or some other header? That's preferred
over adding #ifs directly in the source code.