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| author | Jan Henrik Weinstock <jan.weinstock@rwth-aachen.de> | 2021-02-08 17:27:16 +0300 |
|---|---|---|
| committer | Stafford Horne <shorne@gmail.com> | 2021-02-08 23:38:50 +0300 |
| commit | 8f722f67452f4b28cd8d7acf1658daa5796437c2 (patch) | |
| tree | d3e81e4d84faa2716ccaa36c10b801283b60cf63 /arch | |
| parent | 2261352157a932717ec08b9dd18d1bfbb7c37c52 (diff) | |
| download | linux-8f722f67452f4b28cd8d7acf1658daa5796437c2.tar.xz | |
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 <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>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/openrisc/kernel/smp.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c index 29c82ef2e207..48e1092a64de 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> @@ -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) |