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arm64: read enable-method for CPU0

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With the advent of CPU_HOTPLUG, the enable-method property for CPU0 may
tells us something useful (i.e. how to hotplug it back on), so we must
read it along with all the enable-method for all the other CPUs.  Even
on UP the enable-method may tell us useful information (e.g. if a core
has some mechanism that might be usable for cpuidle), so we should
always read it.

This patch factors out the reading of the enable method, and ensures
that CPU0's enable method is read regardless of whether the kernel is
built with SMP support.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Mark Rutland
2013-10-24 20:30:17 +01:00
committed by Catalin Marinas
parent 652af89979
commit e8765b265a
4 changed files with 58 additions and 19 deletions
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3
arch/arm64/include/asm/cpu_ops.h
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@@ -44,6 +44,7 @@ struct cpu_operations {
};
extern const struct cpu_operations *cpu_ops[NR_CPUS];
extern const struct cpu_operations * __init cpu_get_ops(const char *name);
extern int __init cpu_read_ops(struct device_node *dn, int cpu);
extern void __init cpu_read_bootcpu_ops(void);
#endif /* ifndef __ASM_CPU_OPS_H */