linux-kernel - Re: aio: compat

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Date:	Thu, 11 Mar 2010 14:13:19 -0500
From:	Jeff Moyer <jmoyer@...hat.com>
To:	Michael Tokarev <mjt@....msk.ru>
Cc:	linux-aio@...ck.org, Linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: aio: compat_ioctl issue?

Michael Tokarev <mjt@....msk.ru> writes:

> Jeff Moyer wrote:
> []
>> Yeah, whoops.  I built the libaio test harness using -m32 and this patch
>> works for me.  Would you mind giving it a try?
>
> It appears to work here so far.  I did not run massive i/o test suite
> but it now passes basic multiple kernel unpacking in parallel tests
> (before it didnt' even recognize the partition table).
>
> So the patch - at least basically - works.
>
> Except that we now have code duplication in kernel.  Look at
> fs/compat.c:compat_do_readv_writev() - it does the same as
> compat_rw_copy_check_uvector() plus a bit more.  I guess it
> is a good idea to use compat_rw_copy_check_uvector() in
> compat_do_readv_writev() to build the compat vectors...

I'm well aware of the code duplication, thanks.  You can even find
another copy in net/compat.c.  I'll see what I can do about it.

Cheers,
Jeff
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