netdev - Re: [PATCH net-next] fast_hash: clobber registers correctly for inline function use

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Message-ID: <CAHA+R7NKrwE7F4k4wiaZRJ67QAhB9bUe8SdyuT8Ky3-wAou6cA@mail.gmail.com>
Date:	Fri, 14 Nov 2014 11:02:28 -0800
From:	Cong Wang <cwang@...pensource.com>
To:	David Miller <davem@...emloft.net>
Cc:	Hannes Frederic Sowa <hannes@...essinduktion.org>,
	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>,
	Or Gerlitz <ogerlitz@...lanox.com>,
	Pravin B Shelar <pshelar@...ira.com>,
	Jesse Gross <jesse@...ira.com>, jay.vosburgh@...onical.com,
	discuss@...nvswitch.org
Subject: Re: [PATCH net-next] fast_hash: clobber registers correctly for
 inline function use

On Fri, Nov 14, 2014 at 10:38 AM, David Miller <davem@...emloft.net> wrote:
>
> Also, I am strongly of the opinion that this is a mis-use of the
> alternative call interface.  It was never intended to be used for
> things that can make real function calls.
>
> You can add a million clobbers, or a trampoline, it's still using a
> facility in a manner for which it was not designed.
>
> This means a new interface with a new name and with capabilities
> explicitly supporting this case are in order.
>

I am wondering, compare with alternative call, how slower is just testing
cpu_has_xmm4_2?
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