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

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Message-ID: <20090701131326.GB13524@elte.hu>
Date:	Wed, 1 Jul 2009 15:13:26 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	David Howells <dhowells@...hat.com>
Cc:	Paul Mackerras <paulus@...ba.org>, 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


* David Howells <dhowells@...hat.com> wrote:

> 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.

Yeah - still i'd suggest to just go with the generic code initially, 
as then 'perf' output itself can be used to verify whether the FRV 
atomic64_t implementation is correct.

	Ingo
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