| Subject | Re: [PATCH 08/10] x86-32: support atomic64_t on 386/486 UP/SMP | From | Peter Zijlstra <> | Date | Thu, 18 Feb 2010 11:25:46 +0100 |
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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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