Re: [PATCH] Use devicetree to determine present cpus

[Jan Henrik Weinstock]

Signed-off-by: Jan Henrik Weinstock <jan.weinst...@rwth-aachen.de>
---

Re-send patch with git sendmail

 arch/openrisc/kernel/smp.c | 18 +++++++++++++++---
 1 file changed, 15 insertions(+), 3 deletions(-)

diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c
index 29c82ef2e..75be7e34f 100644
--- a/arch/openrisc/kernel/smp.c
+++ b/arch/openrisc/kernel/smp.c
@@ -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>
@@ -68,14 +69,25 @@ 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)
-- 
2.17.1