Re: [PATCH 3/6] x86-mce: Clear CMCI enable on all claimed CMCI banks before reboot.

From: Havard Skinnemoen
Date: Wed Jul 09 2014 - 17:41:00 EST

On Wed, Jul 9, 2014 at 1:36 PM, Luck, Tony <tony.luck@xxxxxxxxx> wrote:
> + if (!xchg(&reboot_notifier_registered, true))
> + register_reboot_notifier(&cmci_reboot_notifier);
> This is super-safe ... but isn't the xchg() overkill? I thought we serialized bringup
> of other cpus.

Could be. There are spinlocks being taken elsewhere in that path
though, and I'm not sure if I see any downside with the xchg(), unless
this path is actually performance-critical.

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