failsafe mechanism to HPET clock calibration
Provide a failsafe mechanism to avoid kernel spinning forever at read_hpet_tsc during early kernel bootup. This failsafe mechanism was originally introduced in commit 2f7a2a79, but looks like the hpet split from time.c lost it again. This reintroduces the failsafe mechanism Signed-off-by: NRavikiran Thirumalai <kiran@scalex86.org> Signed-off-by: NShai Fultheim <shai@scalex86.org> Cc: Jack Steiner <steiner@sgi.com> Cc: john stultz <johnstul@us.ibm.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>
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