linux-kernel - Re: [PATCH 2/3] Create compat_sys_migrate

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Message-ID: <Pine.LNX.4.64.0610261158130.2802@schroedinger.engr.sgi.com>
Date:	Thu, 26 Oct 2006 12:00:30 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Stephen Rothwell <sfr@...b.auug.org.au>
cc:	LKML <linux-kernel@...r.kernel.org>,
	ppc-dev <linuxppc-dev@...abs.org>, paulus@...ba.org, ak@...e.de,
	linux-mm@...ck.org
Subject: Re: [PATCH 2/3] Create compat_sys_migrate_pages

On Thu, 26 Oct 2006, Stephen Rothwell wrote:

> This is needed on bigendian 64bit architectures. The obvious way to do
> this (taking the other compat_ routines in this file as examples) is to
> use compat_alloc_user_space and copy the bitmasks back there, however you
> cannot call compat_alloc_user_space twice for a single system call and
> this method saves two copies of the bitmasks.

Well this means also that sys_mbind and sys_set_mempolicy are also
broken because these functions also use get_nodes().

Fixing get_nodes() to do the proper thing would fix all of these 
without having to touch sys_migrate_pages or creating a compat_ function 
(which usually is placed in kernel/compat.c)
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