From 8f722f67452f4b28cd8d7acf1658daa5796437c2 Mon Sep 17 00:00:00 2001 From: Jan Henrik Weinstock Date: Mon, 8 Feb 2021 15:27:16 +0100 Subject: [PATCH] openrisc: Use devicetree to determine present cpus 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 [shorne: Squashed 2 email commits and added summary from email] Cc: Geert Uytterhoeven Signed-off-by: Stafford Horne --- arch/openrisc/kernel/smp.c | 23 +++++++++++++++++------ 1 file changed, 17 insertions(+), 6 deletions(-) diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c index 29c82ef..48e1092 100644 --- a/arch/openrisc/kernel/smp.c +++ b/arch/openrisc/kernel/smp.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -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) -- 2.7.4