From: "David S. Miller" <davem@redhat.com>
To: zaitcev@redhat.com
Cc: mingo@redhat.com, torvalds@transmeta.com, linux-kernel@vger.kernel.org
Subject: Re: cmpxchg in 2.5.38
Date: Tue, 24 Sep 2002 21:54:58 -0700 (PDT) [thread overview]
Message-ID: <20020924.215458.66723020.davem@redhat.com> (raw)
In-Reply-To: <20020925010044.A4464@devserv.devel.redhat.com>
From: Pete Zaitcev <zaitcev@redhat.com>
Date: Wed, 25 Sep 2002 01:00:44 -0400
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?
Indeed, we can't really make cmpxchg a requirement, many
cpus lack it.
next prev parent reply other threads:[~2002-09-25 4:59 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-09-25 5:00 cmpxchg in 2.5.38 Pete Zaitcev
2002-09-25 4:54 ` David S. Miller [this message]
2002-09-25 7:18 ` Oleg Drokin
2002-09-25 7:47 ` David S. Miller
2002-09-25 8:07 ` Oleg Drokin
2002-09-25 8:26 ` Ingo Molnar
2002-09-25 8:48 ` [patch] pidhash-2.5.38-A0 Ingo Molnar
2002-09-25 12:04 ` cmpxchg in 2.5.38 Geert Uytterhoeven
2002-09-25 17:42 ` Pete Zaitcev
2002-09-25 19:34 ` Ingo Molnar
2002-09-25 20:03 ` David S. Miller
2002-09-25 18:59 ` David S. Miller
2002-09-25 19:02 ` David S. Miller
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