linux-kernel - patch "x86: MOVE PCI IO ECS code to x86/pci" breaks CPU hotplug

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Date:	Thu, 21 Aug 2008 13:45:20 +0100
From:	"Jan Beulich" <jbeulich@...ell.com>
To:	<robert.richter@....com>, "Ingo Molnar" <mingo@...e.hu>
Cc:	<linux-kernel@...r.kernel.org>
Subject: patch "x86: MOVE PCI IO ECS code to x86/pci" breaks CPU
	hotplug

Converting __cpuinit functions called out of init_amd() (and similar others)
to __init (and making them subject of xxx_initcall() handling isn't valid, as
they would no longer be called for hot plugged CPUs.

Further, since it's likely that in virtualized environments the MSR write
would at best be ignored, I'd also recommend using the fault-safe
accessors here *and* check that the bit actually got set before setting
PCI_HAS_IO_ECS (one would obviously have to BUG() when hot-plugged
CPUs fail to set the bit when those available at boot successfully did so).

Jan

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