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SubjectRe: [PATCH v2 15/31] arm64: SMP support
On Tuesday 14 August 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 <>
> Signed-off-by: Marc Zyngier <>
> Signed-off-by: Catalin Marinas <>

Acked-by: Arnd Bergmann <>

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