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arm64: Improve parking of stopped CPUs

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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>
This commit is contained in:
Jayachandran C 2019-06-17 23:35:18 +03:00 committed by Catalin Marinas
parent ca9503fc9e
commit dccc9da22d
1 changed files with 1 additions and 3 deletions
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4
arch/arm64/kernel/smp.c
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@ -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