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

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6D0F6FDD8D@AcuExch.aculab.com>
Date:	Thu, 24 Apr 2014 08:28:56 +0000
From:	David Laight <David.Laight@...LAB.COM>
To:	'Alexei Starovoitov' <ast@...mgrid.com>,
	Daniel Borkmann <dborkman@...hat.com>
CC:	"David S. Miller" <davem@...emloft.net>,
	Network Development <netdev@...r.kernel.org>
Subject: RE: [PATCH net-next 5/5] net: filter: optimize BPF migration for
 ARG1/CTX handling

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.

	David



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