linux-kernel - Re: [PATCH] arm, exec: remove redundant set_fs(USER

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Message-ID: <BANLkTimFL44XRDeA6z6pvKGw-zpcdsNUEw@mail.gmail.com>
Date:	Fri, 10 Jun 2011 15:53:24 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	Russell King - ARM Linux <linux@....linux.org.uk>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] arm, exec: remove redundant set_fs(USER_DS)

On Fri, Jun 10, 2011 at 3:48 PM, Russell King - ARM Linux
<linux@....linux.org.uk> wrote:
> On Fri, Jun 10, 2011 at 03:08:57PM +0200, Mathias Krause wrote:
>> The address limit is already set in flush_old_exec() so this
>> set_fs(USER_DS) is redundant.
>
> Please show where and how this is done.  I've looked and can't see
> any equivalent call to set_fs() in flush_old_exec().

Before dac853a (exec: delay address limit change until point of no
return) it was done in search_binary_handler(), now it is done in
flush_old_exec(). Either way set_fs(USER_DS) was/gets called before
start_thread() so the call there is redundant.

Mathias
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