All of lore.kernel.org
 help / color / mirror / Atom feed
From: Chuck Ebbert <cebbert@redhat.com>
To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: mbind and alignment
Date: Tue, 03 Apr 2007 17:27:02 -0400	[thread overview]
Message-ID: <4612C6A6.9020003@redhat.com> (raw)
In-Reply-To: <20070402204202.GC3316@interface.famille.thibault.fr>

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'.


WARNING: multiple messages have this Message-ID (diff)
From: Chuck Ebbert <cebbert@redhat.com>
To: Samuel Thibault <samuel.thibault@ens-lyon.org>,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: mbind and alignment
Date: Tue, 03 Apr 2007 17:27:02 -0400	[thread overview]
Message-ID: <4612C6A6.9020003@redhat.com> (raw)
In-Reply-To: <20070402204202.GC3316@interface.famille.thibault.fr>

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'.

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>

  reply	other threads:[~2007-04-03 21:27 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2007-04-02 20:42 mbind and alignment Samuel Thibault
2007-04-02 20:42 ` Samuel Thibault
2007-04-03 21:27 ` Chuck Ebbert [this message]
2007-04-03 21:27   ` Chuck Ebbert
2007-04-04 11:52 ` Andi Kleen
2007-04-04 11:52   ` Andi Kleen
2007-04-04 12:26   ` Samuel Thibault
2007-04-04 12:26     ` Samuel Thibault
2007-04-04 17:19   ` Hugh Dickins
2007-04-04 17:19     ` Hugh Dickins

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=4612C6A6.9020003@redhat.com \
    --to=cebbert@redhat.com \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mm@kvack.org \
    --cc=samuel.thibault@ens-lyon.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.