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Date: Mon, 30 Apr 2001 18:13:04 +0200
From: Andrea Arcangeli <andrea@suse.de>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: "Magnus Naeslund(f)" <mag@fbab.net>,
        linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: Alpha compile problem solved by Andrea (pte_alloc)
Message-ID: <20010430181304.B5917@athlon.random>
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In-Reply-To: <m1g0erqbxh.fsf@frodo.biederman.org>; from ebiederm@xmission.com on Sun, Apr 29, 2001 at 09:55:06PM -0600
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On Sun, Apr 29, 2001 at 09:55:06PM -0600, Eric W. Biederman wrote:
> Hmm. I was having problems reproducible with
> CONFIG_ALPHA_LARGE_VMALLOC n.
> 
> Enabling the large vmalloc was my work around, because the large
> vmalloc whet back to the prelazy allocation code.

I don't have a clue about your problems but certainly the
CONFIG_ALPHA_LARGE_VMALLOC n is not racy while the
CONFIG_ALPHA_LARGE_VMALLOC y is racy.

> problem I had was entries failed to propagate across different tasks.

With CONFIG_ALPHA_LARGE_VMALLOC n the entry is propagated before
starting using the new pgd so it cannot race, there's no special page
fault case for that beacuse you will never get a page fault because of
an unmapped pgd entry in the vmalloc space in first place.

Andrea
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