linux-kernel - Re: [patch 1/9] compat_ioctl: move common block ioctls to compat_blkdev

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Date:	Sun, 7 Oct 2007 01:44:26 +0200
From:	Arnd Bergmann <arnd@...db.de>
To:	Christoph Hellwig <hch@...radead.org>,
	Jens Axboe <jens.axboe@...cle.com>,
	linux-kernel@...r.kernel.org, davem@...emloft.net, hch@....de,
	Al Viro <viro@....linux.org.uk>
Subject: Re: [patch 1/9] compat_ioctl: move common block ioctls to compat_blkdev_ioctl

On Saturday 06 October 2007, Christoph Hellwig wrote:
> > +static int compat_put_u64(unsigned long arg, u64 val)
> > +{
> > +     return put_user(val, (compat_u64 __user *)compat_ptr(arg));
> > +}
> 
> These should probably be in compat.h

Hmm, I'm not sure. They are modeled after the put_{short,int,uint,...}
functions that only exist in block/ioctl.c and I put them in so I
could use almost identical code in the native and compat path.

If we find these generally useful, I guess we could have both
versions of each of these functions in global headers, e.g. in
linux/uaccess.h and linux/compat.h, but right now I would recommend
using plain put_user in all compat code except for block ioctl.

	Arnd <><
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