linux-kernel - Re: [PATCH] FRV: Wire up new syscalls

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Message-ID: <32707.1246452087@redhat.com>
Date:	Wed, 01 Jul 2009 13:41:27 +0100
From:	David Howells <dhowells@...hat.com>
To:	Paul Mackerras <paulus@...ba.org>
Cc:	dhowells@...hat.com, Ingo Molnar <mingo@...e.hu>,
	Arnd Bergmann <arnd@...db.de>, torvalds@...l.org,
	akpm@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] FRV: Wire up new syscalls

Paul Mackerras <paulus@...ba.org> wrote:

> I did a generic implementation using irq disable on UP and hashed
> spin-locks on SMP.  See 09d4e0ed for the implementation

I can do better than that on FRV.  FRV has load/store-double instructions that
I can use to atomically load/store 64-bit memory locations by using paired
registers for the data.

David
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