netdev - Re: More prefetch fall-out

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Message-ID: <BANLkTimQAhP17Hg6D84gtCO3nJ_SSsDAeg@mail.gmail.com>
Date:	Sun, 22 May 2011 11:38:44 -0700
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>
Subject: Re: More prefetch fall-out

On Sun, May 22, 2011 at 11:23 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>
> Taking a look at various skb_queue_walk* call sites, I think prefetches
> are not a clear win, I would just remove them all from skbuff.h

Hmm.

I did that, and it turns out that we also have:

 - *lots* of network drivers that use "prefetch" (without including prefetch.h)
 - net/netlabel/netlabel_addrlist.h doing the same.

and fixing that up is annoying "grunt work".

So for now, I think I'll just do the "add the <linux/prefetch.h> to
<linux/skbuff.h>" thing, and leave networking alone. That makes
everything compile ("allyesconfig") even with my "you *have* to
include <linux/prefetch.h>" test-patch.

                                 Linus
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