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From: Arnd Bergmann <arnd@arndb.de>
To: Catalin Marinas <catalin.marinas@arm.com>
Subject: Re: [PATCH v3 15/31] arm64: SMP support
Date: Fri, 7 Sep 2012 19:39:45 +0000
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On Friday 07 September 2012, Catalin Marinas wrote:
> This patch adds SMP initialisation and spinlocks implementation for
> AArch64. The spinlock support uses the new load-acquire/store-release
> instructions to avoid explicit barriers. The architecture also specifies
> that an event is automatically generated when clearing the exclusive
> monitor state to wake up processors in WFE, so there is no need for an
> explicit DSB/SEV instruction sequence. The SEVL instruction is used to
> set the exclusive monitor locally as there is no conditional WFE and a
> branch is more expensive.
> 
> For the SMP booting protocol, see Documentation/arm64/booting.txt.
> 
> Signed-off-by: Will Deacon <will.deacon@arm.com>
> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
> Acked-by: Arnd Bergmann <arnd@arndb.de>
> Acked-by: Tony Lindgren <tony@atomide.com>

Acked-by: Arnd Bergmann <arnd@arndb.de>