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Use device tree instead of max_cpus to determine present cpus #8

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Use device tree instead of max_cpus to determine present cpus #8

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18 changes: 15 additions & 3 deletions arch/openrisc/kernel/smp.c
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Original file line number Diff line number Diff line change
Expand Up @@ -15,6 +15,7 @@
#include <linux/cpu.h>
#include <linux/sched.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <asm/cpuinfo.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
Expand Down Expand Up @@ -67,14 +68,25 @@ void __init smp_init_cpus(void)

void __init smp_prepare_cpus(unsigned int max_cpus)
{
int i;
u32 cpu_id;
struct device_node *cpu, *cpus;

/*
* Initialise the present map, which describes the set of CPUs
* actually populated at the present time.
*/
for (i = 0; i < max_cpus; i++)
set_cpu_present(i, true);
cpus = of_find_node_by_path("/cpus");
for_each_child_of_node(cpus, cpu) {
if (of_property_read_u32(cpu, "reg", &cpu_id)) {
pr_warn("%s missing reg property", cpu->full_name);
continue;
}

if (cpu_id >= max_cpus)
continue;

set_cpu_present(cpu_id, true);
}
}

void __init smp_cpus_done(unsigned int max_cpus)
Expand Down