linux-kernel - Re: [PATCH 3/6] generic sys

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Message-ID: <26191.1265639672@redhat.com>
Date:	Mon, 08 Feb 2010 14:34:32 +0000
From:	David Howells <dhowells@...hat.com>
To:	Christoph Hellwig <hch@....de>
Cc:	dhowells@...hat.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org,
	linux@....linux.org.uk, starvik@...s.com, jesper.nilsson@...s.com,
	ysato@...rs.sourceforge.jp, takata@...ux-m32r.org,
	geert@...ux-m68k.org, zippel@...ux-m68k.org, gerg@...inux.org,
	ralf@...ux-mips.org, benh@...nel.crashing.org,
	schwidefsky@...ibm.com, heiko.carstens@...ibm.com,
	lethal@...ux-sh.org, davem@...emloft.net, jdike@...toit.com,
	tglx@...utronix.de, mingo@...hat.com, hpa@...or.com,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH 3/6] generic sys_ipc wrapper

Christoph Hellwig <hch@....de> wrote:

> Add a generic implementation of the ipc demultiplexer syscall.  Except for
> s390 and sparc64 all implementations of the sys_ipc are nearly identical.
> 
> There are slight differences in the types of the parameters, where mips
> and powerpc as the only 64-bit architectures with sys_ipc use unsigned long
> for the "third" argument as it gets casted to a pointer later, while it
> traditionally is an "int" like most other paramters.  frv goes even further
> and uses unsigned long for all parameters execept for "ptr" which is a pointer
> type everywhere.  The change from int to unsigned long for "third" and back
> to "int" for the others on frv should be fine due to the in-register calling
> conventions for syscalls (we already had a similar issue with the generic
> sys_ptrace), but I'd prefer to have the arch maintainers looks over this
> in details.
> 
> Except for that h8300, m68k and m68knommu lack an impplementation of the
> semtimedop sub call which this patch adds, and various architectures have
> different strategies for the SHMAT version 1 case which apparently never
> gets used - at least on i386 it seems superflous as the compat code on
> x86-64 and ia64 doesn't even bother to implement it.
> 
> 
> Signed-off-by: Christoph Hellwig <hch@....de>

Acked-by: David Howells <dhowells@...hat.com>
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