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Date: Wed, 25 Sep 2002 11:18:20 +0400
From: Oleg Drokin <green@namesys.com>
To: Pete Zaitcev <zaitcev@redhat.com>
Cc: mingo@redhat.com, linux-kernel@vger.kernel.org
Subject: Re: cmpxchg in 2.5.38
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References: <20020925010044.A4464@devserv.devel.redhat.com>
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Hello!

On Wed, Sep 25, 2002 at 01:00:44AM -0400, Pete Zaitcev wrote:
> The cmpxchg() is used in kernel/pid.c:next_free_map():
> It is implemented on alpha, i386, ia64, ppc64, ppc, sparc64,
> x86_64, but not on mips, cris, arm, s390, s390x, sparc, sh, parisc.
> Do all architectures have to have it?

Ingo said that arches that cannot do cmpxchg in hardware should
provide spinlock-based version.

Bye,
    Oleg
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