linux-kernel - Re: lguest, Re: -mm merge plans for 2.6.23

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Date:	Wed, 11 Jul 2007 11:04:53 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Christoph Hellwig <hch@....de>
Cc:	linux-kernel@...r.kernel.org, rusty@...tcorp.com.au,
	linux-mm@...ck.org
Subject: Re: lguest, Re: -mm merge plans for 2.6.23

On Wed, 11 Jul 2007 14:23:24 +0200
Christoph Hellwig <hch@....de> wrote:

> > lguest-export-symbols-for-lguest-as-a-module.patch
> 
> __put_task_struct is one of those no way in hell should this be exported
> things because we don't want modules messing with task lifetimes.
> 
> Fortunately I can't find anything actually using this in lguest, so
> it looks the issue has been solved in the meantime.
> 

Ther are a couple of calls to put_task_struct() in there, and that needs
__put_task_struct() exported.

> 
> I also have a rather bad feeling about exporting access_process_vm.
> This is the proverbial sledge hammer for access to user vm addresses
> and I'd rather keep it away from module programmers with "if all
> you have is a hammer ..." in mind.

hm, well, access_process_vm() is a convenience wrapper around
get_user_pages(), whcih is exported.

> In lguest this is used by send_dma which from my short reading of the
> code seems to be the central IPC mechanism.  The double copy here
> doesn't look very efficient to me either.  Maybe some VM folks could
> look into a better way to archive this that might be both more
> efficient and not require the export.
> 
> 
> > lguest-the-guest-code.patch
> > lguest-the-host-code.patch
> > lguest-the-host-code-lguest-vs-clockevents-fix-resume-logic.patch
> > lguest-the-asm-offsets.patch
> > lguest-the-makefile-and-kconfig.patch
> > lguest-the-console-driver.patch
> > lguest-the-net-driver.patch
> > lguest-the-block-driver.patch
> > lguest-the-documentation-example-launcher.patch
> 
> Just started to reading this (again) so no useful comment here, but it
> would be nice if the code could follow CodingStyle and place the || and
> && at the end of the line in multiline conditionals instead of at the
> beginning of the new one.
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