From: Thomas Gleixner <tglx@linutronix.de>
Date: Sat, 24 Mar 2007 22:02:49 +0000 (+0100)
Subject: [PATCH] i386: Prevent early access to TSC to avoid crash on TSCless systems
X-Git-Tag: v2.6.21-rc5~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d9a5c0a4e0b4c84850a1a5bbacba3f7858b67037;p=pandora-kernel.git

[PATCH] i386: Prevent early access to TSC to avoid crash on TSCless systems

commit f9690982b8c2f9a2c65acdc113e758ec356676a3 removed the check for
cpu_khz from sched_clock(), which prevented early access to the TSC by
non obvious magic.

This is harmless as long as the CPU has a TSC. On TSCless systems this
results in an illegal instruction trap.

Replace tsc_disabled and tsc_unstable by tsc_enabled, which is only set
when the tsc is available and not unstable.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

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