From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 7 Nov 2007 17:37:48 +0000 (+0100)
Subject: x86: ignore the sys_getcpu() tcache parameter
X-Git-Tag: v2.6.24-rc4~114^2~12
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4307d1e5ada595c87f9a4d16db16ba5edb70dcb1;p=pandora-kernel.git

x86: ignore the sys_getcpu() tcache parameter

dont use the vgetcpu tcache - it's causing problems with tasks
migrating, they'll see the old cache up to a jiffy after the
migration, further increasing the costs of the migration.

In the worst case they see a complete bogus information from
the tcache, when a sys_getcpu() call "invalidated" the cache
info by incrementing the jiffies _and_ the cpuid info in the
cache and the following vdso_getcpu() call happens after
vdso_jiffies have been incremented.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Ulrich Drepper <drepper@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
---

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