linux-kernel - Re: mbind and alignment

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Date:	Tue, 03 Apr 2007 17:27:02 -0400
From:	Chuck Ebbert <cebbert@...hat.com>
To:	Samuel Thibault <samuel.thibault@...-lyon.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: mbind and alignment

Samuel Thibault wrote:
> Hi,
> 
> mbind(start, len, ...) currently requires that "start" be page-aligned,
> but not "len" (which automatically gets page-rounded up).  This is a bit
> odd:
> 
> - the userland type of start is void*, which people would expect to be a
>   pointer to some variable.
> - start needing to be page-aligned but len not needing to is not very
>   consistent.
> - none of this is documented in the manual page dated 2006-02-07
> 
> So one of those should probably be done to free people from headaches:
> 
> - document "start" requirement in the manual page
> - require len to be aligned too, and document the requirements in the
>   manual page
> - drop the "start" requirement and just round down the page + adjust
>   size automatically.
> 

Want to help with man page maintenance?  Grab the latest tarball at
ftp://ftp.win.tue.nl/pub/linux-local/manpages/,
read the HOWTOHELP file and grep the source files for 'FIXME'.

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