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Date: Wed, 25 Sep 2002 01:00:44 -0400
From: Pete Zaitcev <zaitcev@redhat.com>
To: mingo@redhat.com, torvalds@transmeta.com
Cc: Pete Zaitcev <zaitcev@redhat.com>, linux-kernel@vger.kernel.org
Subject: cmpxchg in 2.5.38
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The cmpxchg() is used in kernel/pid.c:next_free_map():

                        if (cmpxchg(&map->page, NULL, (void *) page))
                                free_page(page);

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?

-- Pete