linux-kernel - [RFC PATCH v2 07/12] arm64: smp: add arch specific cpu parking helper

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Message-Id: <20190913181953.45748-8-cristian.marussi@arm.com>
Date:   Fri, 13 Sep 2019 19:19:48 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, mark.rutland@....com,
        peterz@...radead.org, catalin.marinas@....com,
        takahiro.akashi@...aro.org, james.morse@....com,
        hidehiro.kawai.ez@...achi.com, tglx@...utronix.de, will@...nel.org,
        dave.martin@....com, linux-arm-kernel@...ts.infradead.org,
        mingo@...hat.com, x86@...nel.org, dzickus@...hat.com,
        ehabkost@...hat.com, linux@...linux.org.uk, davem@...emloft.net,
        sparclinux@...r.kernel.org, hch@...radead.org
Subject: [RFC PATCH v2 07/12] arm64: smp: add arch specific cpu parking helper

Add an arm64 specific helper which parks the cpu in a more architecture
efficient way.

Signed-off-by: Cristian Marussi <cristian.marussi@....com>
---
 arch/arm64/kernel/smp.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index f0cc2bf84aaa..539e8db5c1ba 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -947,6 +947,12 @@ void tick_broadcast(const struct cpumask *mask)
 }
 #endif
 
+void arch_smp_cpu_park(void)
+{
+	while (1)
+		cpu_park_loop();
+}
+
 void arch_smp_cpus_stop_complete(void)
 {
 	sdei_mask_local_cpu();
-- 
2.17.1