From: Andrew Morton <akpm@zip.com.au>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-kernel@vger.kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Werner Almesberger <wa@almesberger.net>,
"Erik A. Hendriks" <hendriks@lanl.gov>
Subject: Re: [RFC] x86 ELF bootable kernels/Linux booting Linux/LinuxBIOS
Date: Wed, 30 Jan 2002 13:19:17 -0800 [thread overview]
Message-ID: <3C586355.A396525B@zip.com.au> (raw)
In-Reply-To: <m1elk7d37d.fsf@frodo.biederman.org>
"Eric W. Biederman" wrote:
>
> A kernel fix to do proper SMP shutdown so that you can kexec on a SMP kernel
Oh man, you rock. I spent about ten hours last weekend
trying to teach 2-kernel-monte to do this. But the damn
XT clock refused to deliver interrupts to the secondary
kernel when the primary had local APCI enabled :(
On uniprocessor, you can type `sudo monte /boot/bzImage'
and get to `decompressing linux' in two seconds flat. (Having
journalling filesystems rather helps with this trick). It's
lovely.
> The biggest issue I have had is
> with the kernel not properly shutting down devices.
Monte just disables all busmastering on the PCI devices...
> In the short term shutting down devices is trivially handled by
> umounting filesystems, downing ethernet devices, and calling the
> reboot notifier chain. Long term I need to call the module_exit
> routines but they need a little sorting out before I can use them
> during reboot. In particular calling any module_exit routing that clears
> pm_power_off is a no-no.
module_exit() routines for statically-linked drivers often
don't exist - they're in .text.exit. I guess you can just
move .text.exit out of the /DISCARD/ section in vmlinux.lds.
Also, take a look at user-mode-linux's do_exitcalls()
implementation - there's no clear reason why that shouldn't
be mainstreamed.
It would be convenient to be able to directly boot a bzImage,
but I guess elf is workable.
Great work, and thanks! I look forward to 2-second SMP
reboots.
-
next prev parent reply other threads:[~2002-01-30 21:26 UTC|newest]
Thread overview: 52+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-01-30 19:54 [RFC] x86 ELF bootable kernels/Linux booting Linux/LinuxBIOS Eric W. Biederman
2002-01-30 21:19 ` Andrew Morton [this message]
2002-01-30 23:52 ` Keith Owens
2002-01-31 2:42 ` Eric W. Biederman
2002-01-31 2:48 ` H. Peter Anvin
2002-01-31 4:27 ` Eric W. Biederman
2002-01-31 4:41 ` H. Peter Anvin
2002-01-31 5:15 ` Eric W. Biederman
2002-01-31 5:59 ` H. Peter Anvin
[not found] ` <m1n0yvaucy.fsf@frodo.biederman.org>
2002-01-31 17:57 ` H. Peter Anvin
2002-01-31 22:34 ` Eric W. Biederman
2002-01-31 22:52 ` H. Peter Anvin
2002-02-01 7:52 ` Eric W. Biederman
2002-01-31 17:35 ` Erik A. Hendriks
2002-01-31 23:36 ` Eric W. Biederman
2002-02-01 0:03 ` H. Peter Anvin
2002-02-01 9:03 ` Eric W. Biederman
2002-02-01 9:25 ` H. Peter Anvin
2002-02-01 15:42 ` Eric W. Biederman
2002-02-01 18:26 ` H. Peter Anvin
2002-02-02 16:17 ` Eric W. Biederman
2002-02-02 21:06 ` H. Peter Anvin
2002-02-02 23:02 ` Eric W. Biederman
2002-02-03 1:56 ` H. Peter Anvin
2002-02-03 18:43 ` Eric W. Biederman
2002-02-03 19:39 ` H. Peter Anvin
2002-02-03 22:18 ` Rob Landley
2002-02-03 22:24 ` H. Peter Anvin
2002-02-03 22:59 ` Rob Landley
2002-02-03 23:01 ` H. Peter Anvin
2002-02-03 23:47 ` Rob Landley
2002-02-04 1:34 ` H. Peter Anvin
2002-02-04 9:53 ` Marco Colombo
2002-02-04 16:19 ` H. Peter Anvin
2002-02-04 19:55 ` Eric W. Biederman
2002-02-04 20:51 ` Alan Cox
2002-02-04 20:40 ` H. Peter Anvin
2002-02-03 19:48 ` H. Peter Anvin
2002-02-04 20:16 ` Eric W. Biederman
2002-02-04 4:29 ` Keith Owens
2002-02-04 20:01 ` Eric W. Biederman
2002-02-04 12:49 ` Werner Almesberger
2002-02-04 16:26 ` H. Peter Anvin
2002-02-04 19:45 ` Eric W. Biederman
2002-02-04 21:02 ` Werner Almesberger
2002-02-04 21:08 ` H. Peter Anvin
2002-02-05 7:45 ` Eric W. Biederman
2002-02-01 0:46 ` Keith Owens
2002-01-31 3:03 ` Keith Owens
2002-02-01 7:22 ` Greg KH
2002-01-30 21:32 ` H. Peter Anvin
2002-01-31 2:31 ` Eric W. Biederman
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