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Date: Tue, 29 Aug 2006 17:20:55 +0100 From: Ralf Baechle <ralf@...ux-mips.org> To: Christoph Lameter <clameter@....com> Cc: David Howells <dhowells@...hat.com>, Nick Piggin <nickpiggin@...oo.com.au>, Arjan van de Ven <arjan@...radead.org>, Dong Feng <middle.fengdong@...il.com>, ak@...e.de, Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org, linux-arch@...r.kernel.org Subject: Re: Why Semaphore Hardware-Dependent? On Tue, Aug 29, 2006 at 08:56:36AM -0700, Christoph Lameter wrote: > > Because i386 (and x86_64) can do better by using XADDL/XADDQ. > > And Ia64 would like to use fetchadd.... > > > CMPXCHG is not available on all archs, and may not be implemented on all archs > > through other atomic instructions. > > Which arches do not support cmpxchg? MIPS, Alpha - probably any pure RISC load/store architecture. Ralf - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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