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openrisc: Use devicetree to determine present cpus

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Use the device tree to determine the present cpus instead of assuming
all CONFIG_NRCPUS are actually present in the system.

Signed-off-by: Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de>
[shorne: Squashed 2 email commits and added summary from email]
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Stafford Horne <shorne@gmail.com>
This commit is contained in:
Jan Henrik Weinstock 2021-02-08 15:27:16 +01:00 committed by Stafford Horne
parent 2261352157
commit 8f722f6745
1 changed files with 17 additions and 6 deletions
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23
arch/openrisc/kernel/smp.c
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@ -16,6 +16,7 @@
#include <linux/sched.h>
#include <linux/sched/mm.h>
#include <linux/irq.h>
#include <linux/of.h>
#include <asm/cpuinfo.h>
#include <asm/mmu_context.h>
#include <asm/tlbflush.h>
@ -60,22 +61,32 @@ void __init smp_prepare_boot_cpu(void)
void __init smp_init_cpus(void)
{
int i;
struct device_node *cpu;
u32 cpu_id;
for (i = 0; i < NR_CPUS; i++)
set_cpu_possible(i, true);
for_each_of_cpu_node(cpu) {
if (of_property_read_u32(cpu, "reg", &cpu_id)) {
pr_warn("%s missing reg property", cpu->full_name);
continue;
}
if (cpu_id < NR_CPUS)
set_cpu_possible(cpu_id, true);
}
}
void __init smp_prepare_cpus(unsigned int max_cpus)
{
int i;
unsigned int cpu;
/*
* 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);
for_each_possible_cpu(cpu) {
if (cpu < max_cpus)
set_cpu_present(cpu, true);
}
}
void __init smp_cpus_done(unsigned int max_cpus)