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

[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 <[email protected]>
Acked-by: Ingo Molnar <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>