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Date: Wed, 1 Sep 2004 22:43:26 -0700
From: Andrew Morton <akpm@osdl.org>
To: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: jagdmann@gmail.com, linux-kernel@vger.kernel.org
Subject: Re: prevent hdd spin-down at system halt
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Alan Cox <alan@lxorguk.ukuu.org.uk> wrote:
>
> On Mer, 2004-09-01 at 11:01, Dirk Jagdmann wrote:
> > is it possible to disable the spin-down (or powerdown) of hard disks
> > when halting the system, via the kernel cmd-line or some
> > configurations in /proc?
> 
> If someone provides the shutdown infrastructure to determine the
> difference between shutdown/poweroff/return-to-firmware its easy. IDE
> already has an ifdef to handle this on Alpha SRM because the higher
> levels don't provide the ideal information.
> 

People are using the system_state global for this.  I guess this will suit
until it breaks, and we end up doing something else.

See sys_reboot().