Re: [PATCH] x86_64: sync_tsc fix the race (so we can boot)

From: Eric W. Biederman
Date: Fri Jul 29 2005 - 10:54:58 EST

Andi Kleen <ak@xxxxxxx> writes:

> There are some style problems, but that can be fixed later.
> How did you track that nasty it down?

I had a consistent reproducer.

I ruled out hangs in the tsc sync code itself,
by implementing timeouts in all of the loops.

I looked for differences with the ia64 code.

I noticed that sometimes the machine would reboot
and not just hang.

I implemented smp_call_function_single since that was what the ia64
code did. It worked and all of my pieces of evidence just fell

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