linux-kernel - Re: [2.6.25] compat VDSO option not disabling

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Message-ID: <Pine.LNX.4.64.0804251632490.19002@twin.jikos.cz>
Date:	Fri, 25 Apr 2008 16:33:48 +0200 (CEST)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Gerhard Mack <gmack@...erfire.net>
cc:	linux-kernel@...r.kernel.org
Subject: Re: [2.6.25] compat VDSO option not disabling

On Thu, 24 Apr 2008, Gerhard Mack wrote:

> On my laptop I disabled the compat vdso option but it is till being 
> mapped.. Any ideas?

The changelog of the commit below explains that.

commit 1dbf527c51c6c20c19869c8125cb5b87c3d09506
Author: Jeremy Fitzhardinge <jeremy@...p.org>
Date:   Wed May 2 19:27:12 2007 +0200

    [PATCH] i386: Make COMPAT_VDSO runtime selectable.

    Now that relocation of the VDSO for COMPAT_VDSO users is done at
    runtime rather than compile time, it is possible to enable/disable
    compat mode at runtime.

    This patch allows you to enable COMPAT_VDSO mode with "vdso=2" on the
    kernel command line, or via sysctl.  (Switching on a running system
    shouldn't be done lightly; any process which was relying on the compat
    VDSO will be upset if it goes away.)

    The COMPAT_VDSO config option still exists, but if enabled it just
    makes vdso_enabled default to VDSO_COMPAT.

-- 
Jiri Kosina
SUSE Labs

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