linux-kernel - [RFC PATCH 7/7] arm64: smp: add arch specific cpu parking helper

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Message-Id: <20190823115720.605-8-cristian.marussi@arm.com>
Date:   Fri, 23 Aug 2019 12:57:20 +0100
From:   Cristian Marussi <cristian.marussi@....com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-arch@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        dave.martin@....com, james.morse@....com, mark.rutland@....com,
        catalin.marinas@....com, will@...nel.org, tglx@...utronix.de,
        peterz@...radead.org, takahiro.akashi@...aro.org,
        hidehiro.kawai.ez@...achi.com
Subject: [RFC PATCH 7/7] 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 c7497a885cfd..a3fb22b4c870 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