linux-kernel - Re: [patch 1/3] ipmi: Setup ipmi_devintf automatically if ipmi

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Date:	Thu, 23 Oct 2014 11:56:26 +0200
From:	Thomas Renninger <trenn@...e.de>
To:	"Wilck, Martin" <martin.wilck@...fujitsu.com>
Cc:	"minyard@....org" <minyard@....org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"openipmi-developer@...ts.sourceforge.net" 
	<openipmi-developer@...ts.sourceforge.net>
Subject: Re: [patch 1/3] ipmi: Setup ipmi_devintf automatically if ipmi_msghandler gets loaded

On Monday, October 20, 2014 10:28:53 AM Wilck, Martin wrote:
> On Fri, 2014-10-17 at 18:14 +0200, Corey Minyard wrote:
> 
> 
> > How about this.  I did a little research, and there's something called
> > soft module dependencies.  Apparently you can add:
> > 
> > MODULE_SOFTDEP("post: ipmi_devintf")
> > 
> > to ipmi_msghandler.c and modprobe would load ipmi_devintf after loading
> > ipmi_msghandler if it was available.

I do not like this approach for 2 reasons:
1) Same as Martin mentioned: Not avail on all distros yet (not double checked,
   but I trust you).
2) It's still wrong or say, far away from being as it should be:
   Instead of autoloading via userspace (this is what I expect happens here),
   ipmi_devintf should directly be compiled into ipmi_msghandler module
   and be available as soon as ipmi_msghandler is available.
   This saves the overhead of an unneeded additional module
   (memory and loading time overhead -> going through userspace, etc.).

> This is nice, but not commonly available in distro kernels so far.
Sorry, it's not that nice...
> AFAICS, out of the distros Fujitsu supports, only RHEL7 supports it.
Bad.
 
> I vote for MODULE_SOFTDEP for upstream, and modalias for distros that
> don't support MODULE_SOFTDEP yet.
I vote for ipmi_msghandler.c renaming into ipmi_handler.c
I looked around a bit. Renaming is not bad and happens often.
Documentation/laptops/hpfall.c
got renamed into:
Documentation/laptops/freefall.c
history is preserved by using:
git log --follow Documentation/laptops/freefall.c
git blame Documentation/laptops/freefall.c
works as well, showing modifications before the renaming.

I'll send a patchset.

Thanks,

   Thomas
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