linux-kernel - Re: + mm-search_binary_handler-mem-limit-fix.patch added to -mm tree

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Date:	Mon, 29 Jan 2007 19:18:25 +0100
From:	Martin Schwidefsky <schwidefsky@...ibm.com>
To:	Andrew Morton <akpm@...l.org>
Cc:	Heiko Carstens <heiko.carstens@...ibm.com>,
	linux-kernel@...r.kernel.org, dmonakhov@...nvz.org
Subject: Re: + mm-search_binary_handler-mem-limit-fix.patch added to -mm
	tree

On Mon, 2007-01-29 at 09:37 -0800, Andrew Morton wrote:
> hm, thanks for testing - I'll drop it.
> 
> I don't really understand what's wrong with it though.  Maybe it's settng
> USER_DS on kernel threads?

For architectures with a split address space there has to be a call
set_fs(USER_DS) that switches from KERNEL_DS to USER_DS for the init
process. So far this has been done in search_binary_handler and
traditionally the kernel starts with KERNEL_DS to make the early
copy_from_user calls work.
So, what is wrong with always setting USER_DS? We are starting a user
space process after all.

-- 
blue skies,
  Martin.

Martin Schwidefsky
Linux for zSeries Development & Services
IBM Deutschland Entwicklung GmbH

"Reality continues to ruin my life." - Calvin.

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