linux-kernel - Re: uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG

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Message-ID: <20090512165727.363bf109@lxorguk.ukuu.org.uk>
Date:	Tue, 12 May 2009 16:57:27 +0100
From:	Alan Cox <alan@...rguk.ukuu.org.uk>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Jan Beulich <JBeulich@...ell.com>, Ingo Molnar <mingo@...e.hu>,
	Thomas Gleixner <tglx@...utronix.de>, hpa@...or.com,
	linux-kernel@...r.kernel.org
Subject: Re: uses of cmpxchg/xadd in spinlock.h and rwsem.h vs. CONFIG_M386

> Oh, hmm, we do actually attempt to support 386 SMP kernels... I thought
> that config wasn't allowed, but looking at the atomic.h code, it has
> ifdef fallbacks.

We don't support running on SMP 386 hardware but we do in theory support
running uniproc on it.

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