From: Ingo Molnar <mingo@elte.hu>
Date: Wed, 7 Mar 2007 17:12:31 +0000 (+0100)
Subject: [PATCH] CPU hotplug: call check_tsc_sync_source() with irqs off
X-Git-Tag: v2.6.21-rc4~105
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d04f41e35343f1d788551fd3f753f51794f4afcf;p=pandora-kernel.git

[PATCH] CPU hotplug: call check_tsc_sync_source() with irqs off

check_tsc_sync_source() depends on being called with irqs disabled (it
checks whether the TSC is coherent across two specific CPUs). This is
incidentally true during bootup, but not during cpu hotplug __cpu_up().
This got found via smp_processor_id() debugging.

disable irqs explicitly and remove the unconditional enabling of
interrupts. Add touch_nmi_watchdog() to the cpu_online_map busy loop.

this bug is present both on i386 and on x86_64.

Reported-by: Michal Piotrowski <michal.k.k.piotrowski@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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