From cb8cf4f821044f140ea5b9c8d4f816f0c05fab44 Mon Sep 17 00:00:00 2001
From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Date: Thu, 8 Nov 2012 18:05:56 +0000
Subject: [PATCH] ARM: kernel: smp_setup_processor_id() updates
This patch applies some basic changes to the smp_setup_processor_id()
ARM implementation to make the code that builds cpu_logical_map more
uniform across the kernel.
The function now prints the full extent of the boot CPU MPIDR[23:0] and
initializes the cpu_logical_map for CPUs up to nr_cpu_ids.
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Acked-by: Nicolas Pitre <nico@linaro.org>
Acked-by: Will Deacon <will.deacon@arm.com>
---
arch/arm/kernel/setup.c | 7 ++++---
1 file changed, 4 insertions(+), 3 deletions(-)
diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index da1d1aa20ad95..4515bf6abee0e 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -426,13 +426,14 @@ int __cpu_logical_map[NR_CPUS];
void __init smp_setup_processor_id(void)
{
int i;
- u32 cpu = is_smp() ? read_cpuid_mpidr() & 0xff : 0;
+ u32 mpidr = is_smp() ? read_cpuid_mpidr() & MPIDR_HWID_BITMASK : 0;
+ u32 cpu = MPIDR_AFFINITY_LEVEL(mpidr, 0);
cpu_logical_map(0) = cpu;
- for (i = 1; i < NR_CPUS; ++i)
+ for (i = 1; i < nr_cpu_ids; ++i)
cpu_logical_map(i) = i == cpu ? 0 : i;
- printk(KERN_INFO "Booting Linux on physical CPU %d\n", cpu);
+ printk(KERN_INFO "Booting Linux on physical CPU 0x%x\n", mpidr);
}
static void __init setup_processor(void)
--
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