From mboxrd@z Thu Jan 1 00:00:00 1970 From: tony@atomide.com (Tony Lindgren) Date: Fri, 17 Aug 2012 02:21:33 -0700 Subject: [PATCH v2 15/31] arm64: SMP support In-Reply-To: <1344966752-16102-16-git-send-email-catalin.marinas@arm.com> References: <1344966752-16102-1-git-send-email-catalin.marinas@arm.com> <1344966752-16102-16-git-send-email-catalin.marinas@arm.com> Message-ID: <20120817092133.GR11011@atomide.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org * Catalin Marinas [120814 11:05]: > 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. Do we always have SMP hardware on arm64? Or are we going to need to again add smp_on_up support later on? Other than that: Acked-by: Tony Lindgren