linux-kernel - Re: [PATCH] arch: avr32: add dummy syscalls

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Date:	Mon, 4 Feb 2013 03:02:21 +0000
From:	Al Viro <viro@...IV.linux.org.uk>
To:	Hans-Christian Egtvedt <egtvedt@...fundet.no>
Cc:	Matthias Brugger <matthias.bgg@...il.com>,
	Haavard Skinnemoen <hskinnemoen@...il.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	David Howells <dhowells@...hat.com>,
	Dave Jones <davej@...hat.com>,
	Will Deacon <will.deacon@....com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arch: avr32: add dummy syscalls

On Mon, Feb 04, 2013 at 01:31:11AM +0000, Al Viro wrote:

> Unless I'm misreading ocavr32.pdf, that should be (R12, R10:R11, R9, R8) and
> (R12, R10:R11, R9:R8, stack) resp., so fadvise64 doesn't need a wrapper, but
> fadvise64_64 does.  And something like (s32, s32, s64, s64) would turn into
> (R12, R11, R9:R8, stack, stack); AFAICS, we don't have anything that ugly...

Oh, yes, we do - fallocate(2).  int fd, int mode, loff_t offset, loff_t len.
On something like mips or sparc32 it packs nicely; on avr32 it doesn't.
Could you confirm that I haven't misparsed the ABI?

> Automating *that* is going to be interesting...  I've not given up, but it's
> not going to be fun ;-/
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