Messages in this thread | | | Subject | Re: [lkcd-devel] Re: What's left over. | From | (Eric W. Biederman) | Date | 05 Nov 2002 19:48:58 -0700 |
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Alan Cox <alan@lxorguk.ukuu.org.uk> writes:
> On Tue, 2002-11-05 at 18:00, Werner Almesberger wrote: > > Yes, I've just checked with Eric, and he hasn't received any > > indication from Linus so far. I posted a reminder to linux-kernel. > > I'd really hate to see kexec miss 2.6. > > Let me ask the same dumb question - what does kexec need that a dumper > doesn't. In other words given reboot/trap hooks can kexec happily live > as a standalone module ?
Kexec primarily needs the reboot/trap hooks in working order, and exported, for it to live externally to the kernel.
Currently the reboot_notifier call chain is private to sys.c, and is not exported even to other parts of the kernel.
Even together device_shutdown, and the reboot_notifier do not properly shutdown the cpus on an SMP system.
Plus we are missing quite a ->shutdown methods at random in the kernel, and if kexec is not easily available someone might not get around to writing and debugging them.
Plus a system call seems the natural interface for something that appears to be a reboot.
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