netdev - Re: [PATCH net-next 5/5] net: filter: optimize BPF migration for ARG1/CTX handling

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Message-Id: <20140424.115523.296790709263872877.davem@davemloft.net>
Date:	Thu, 24 Apr 2014 11:55:23 -0400 (EDT)
From:	David Miller <davem@...emloft.net>
To:	David.Laight@...LAB.COM
Cc:	ast@...mgrid.com, dborkman@...hat.com, netdev@...r.kernel.org
Subject: Re: [PATCH net-next 5/5] net: filter: optimize BPF migration for
 ARG1/CTX handling

From: David Laight <David.Laight@...LAB.COM>
Date: Thu, 24 Apr 2014 08:28:56 +0000

> From: Alexei Starovoitov
> ...
>> Have to correct myself here.
>> sparc is an architecture where args are passed in %o regs
>> and received by the callee in %i regs, so there is a precedent.
> ...
> 
> Not actually true, the parameters are still in the %o regs
> in the called function.
> It is the called function that rotates the register window,
> not the act of making the function call.
> Small leaf functions will typically use the existing register
> window.

Correct.
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