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To: Marcelo Tosatti <marcelo.tosatti@cyclades.com>
cc: Mika Penttila <mika.penttila@kolumbus.fi>,
       Dave Kleikamp <shaggy@austin.ibm.com>,
       linux-kernel <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH] BUG() in exec_mmap()
In-Reply-To: My message of "Thu, 09 Oct 2003 21:01:11 EDT."
Date: Thu, 09 Oct 2003 21:24:19 -0400
From: Ernie Petrides <petrides@redhat.com>
Sender: linux-kernel-owner@vger.kernel.org
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On Thursday, 9-Oct-2003 at 21:1 EDT, Ernie Petrides wrote:

> Sorry I missed the discussion on the original changes.  Was there a
> race condition with another cpu gaining a reference in proc_pid_status()
> or access_process_vm() or something like that?  Is it possible to just
> use down_read(&old_mm->mmap_sem) and up_read(&old_mm->mmap_sem) inside
> exec_mmap() around the optimized call to exit_mmap() instead?

I meant down_write() and up_write().  (But I haven't evaluated whether
this would be feasible.)

Cheers.  -ernie