linux-kernel - Re: [PATCH 08/10] x86-32: support atomic64

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Message-ID: <1266488746.26719.120.camel@laptop>
Date:	Thu, 18 Feb 2010 11:25:46 +0100
From:	Peter Zijlstra <peterz@...radead.org>
To:	Luca Barbieri <luca@...a-barbieri.com>
Cc:	mingo@...e.hu, hpa@...or.com, akpm@...ux-foundation.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 08/10] x86-32: support atomic64_t on 386/486 UP/SMP

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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