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Date: Fri, 25 Jul 2003 16:11:27 -0500
From: "Alan L. Cox" <alc@imimic.com>
Organization: iMimic Networking, Inc.
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To: Maxime Henrion <mux@FreeBSD.org>
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Subject: Re: cvs commit: src/sys/vm vm_contig.c
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Maxime Henrion wrote:
> 
> mux         2003/07/25 14:02:25 PDT
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/vm               vm_contig.c
>   Log:
>   Add support for the M_ZERO flag to contigmalloc().
> 
>   Reviewed by:    jeff
> 
>   Revision  Changes    Path
>   1.21      +5 -1      src/sys/vm/vm_contig.c

This has a bug.  The page is not mapped at the time you perform
bzero().  (In fact, it is not mapped until after the vm_map_wire()
occurs.)  Thus, you need to use pmap_zero_page() instead.

Your tests probably succeeded because of page prezeroing.  (With
prezeroing, you never exercised the bug.)

I'm pretty sure that I sent you an e-mail about this.  If not, I
apologize.

Regards,
Alan