Commit dccc9da2 authored Jun 17, 2019 by Jayachandran C Committed by Catalin Marinas Jun 25, 2019

arm64: Improve parking of stopped CPUs



The current code puts the stopped cpus in an 'yield' instruction loop.
Using a busy loop here is unnecessary, we can use the cpu_park_loop()
function here to do a wfi/wfe.

Signed-off-by: Jayachandran C <jnair@caviumnetworks.com>
Signed-off-by: Aaro Koskinen <aaro.koskinen@nokia.com>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>

parent ca9503fc

arch/arm64/kernel/smp.c

+1 −3

Original line number	Diff line number	Diff line
		@@ -850,9 +850,7 @@ static void ipi_cpu_stop(unsigned int cpu)

		local_daif_mask();
		sdei_mask_local_cpu();

		while (1)
		cpu_relax();
		cpu_park_loop();
		}

		#ifdef CONFIG_KEXEC_CORE

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