mirror of https://gitee.com/openkylin/linux.git
arm64: Add a helper for parking CPUs in a loop
Adds a routine which can be used to park CPUs (spinning in kernel) when they can't be killed. Cc: Mark Rutland <mark.rutland@arm.com> Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
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@ -78,4 +78,12 @@ extern int __cpu_disable(void);
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extern void __cpu_die(unsigned int cpu);
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extern void cpu_die(void);
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static inline void cpu_park_loop(void)
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{
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for (;;) {
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wfe();
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wfi();
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}
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}
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#endif /* ifndef __ASM_SMP_H */
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@ -890,10 +890,7 @@ static void fail_incapable_cpu(char *cap_type,
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/* Check if we can park ourselves */
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if (cpu_ops[cpu] && cpu_ops[cpu]->cpu_die)
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cpu_ops[cpu]->cpu_die(cpu);
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asm(
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"1: wfe\n"
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" wfi\n"
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" b 1b");
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cpu_park_loop();
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}
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/*
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