On Mon, 2008-12-22 at 03:11 +0300, Anton Vorontsov wrote: > On Mon, Dec 22, 2008 at 10:08:42AM +1100, Michael Ellerman wrote: > > On Tue, 2008-12-16 at 19:23 +0300, Anton Vorontsov wrote: > > > This patch removes need for each platform to specify default kexec and > > > crash kernel ops, thus effectively adds a working kexec support for most > > > boards. > > > > > > Platforms that can't cope with default ops will explode in some weird > > > way (a hang or reboot is most likely), which means that the board's > > > kexec support should be fixed or blacklisted via dummy _prepare callback > > > returning -ENOSYS. > > > > But where is the patch to do this? > > The -ENOSYS dummy callback is a last resort thing to do when nobody > cares or it's impossible to fix the Kexec on some board. We don't > have any such boards (yet).
Yes we do, iseries, so at the very least we need a patch for that. > > The chance of kexec working on some random machine that's never been > > tested is pretty slim, every driver needs to be aware its hardware might > > be in a weird state, > > The boards setup isn't always static. The Kexec might work perfectly > well on a standalone board, but might hang with some weird PCI device > attached to it (think that it might need some PCI fixup on shutdown). > > I think that a "Kexec tested to work on a particular board" term > just doesn't exist. It might work, but it might hang with other setup > on the *same* board. Sure, nothing is 100%, I'd just rather that someone has at least tried a kexec on the basic config and had it work. > But in practice the Kexec work on every 6xx board I have. And I have > pretty much of Freescale boards (almost all from the 83xx series), > and I don't think it's practical to add #ifdef CONFIG_KEXEC into the > every board file... OK in that case I'm OK with it. The Kconfig restricts it to only PPC64 or 6xx, so it's not enabled on _every_ platform. cheers -- Michael Ellerman OzLabs, IBM Australia Development Lab wwweb: http://michael.ellerman.id.au phone: +61 2 6212 1183 (tie line 70 21183) We do not inherit the earth from our ancestors, we borrow it from our children. - S.M.A.R.T Person
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