From: Jeremy Fitzhardinge <jeremy@goop.org>
Date: Tue, 8 Jul 2008 22:06:42 +0000 (-0700)
Subject: x86_64: add workaround for no %gs-based percpu
X-Git-Tag: v2.6.27-rc1~955^2~1^20~48
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5b09b2876ed1a8e34a0da8f069575fc6174e2077;p=pandora-kernel.git

x86_64: add workaround for no %gs-based percpu

As a stopgap until Mike Travis's x86-64 gs-based percpu patches are
ready, provide workaround functions for x86_read/write_percpu for
Xen's use.

Specifically, this means that we can't really make use of vcpu
placement, because we can't use a single gs-based memory access to get
to vcpu fields.  So disable all that for now.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Cc: Stephen Tweedie <sct@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Cc: Mark McLoughlin <markmc@redhat.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
---

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