Re: [PATCH 08/10] x86-32: support atomic64_t on 386/486 UP/SMP

[Peter Zijlstra]

On Wed, 2010-02-17 at 12:42 +0100, Luca Barbieri wrote:
> This patch makes atomic64 use either the generic implementation or
> the rewritten cmpxchg8b one just introduced by inserting a "call" to
> either, using the alternatives system to dynamically switch the calls.
> 
> This allows to use atomic64_t on 386/486 which lack cmpxchg8b

IIRC we dropped <i586 SMP support, and since we don't have a PMU on
those chips atomic64_t doesn't need to be NMI safe, so a simple
UP-IRQ-disable implementation should suffice.

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