ARM: kernel: add MIDR to per-CPU information data

The advent of big.LITTLE ARM platforms requires the kernel to be able to identify the MIDRs of all online CPUs upon request. MIDRs are stashed at boot time so that kernel subsystems can detect the MIDR of online CPUs by simply retrieving per-CPU data updated by all booted CPUs. Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Acked-by: Nicolas Pitre <nico@linaro.org>
git-mirror · Nov 19, 2012 · e8d432c · e8d432c
1 parent 77b6706
commit e8d432c
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diff --git a/arch/arm/include/asm/cpu.h b/arch/arm/include/asm/cpu.h
@@ -15,6 +15,7 @@
 
 struct cpuinfo_arm {
 	struct cpu	cpu;
+	u32		cpuid;
 #ifdef CONFIG_SMP
 	unsigned int	loops_per_jiffy;
 #endif

diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
@@ -281,6 +281,7 @@ static void __cpuinit smp_store_cpu_info(unsigned int cpuid)
 	struct cpuinfo_arm *cpu_info = &per_cpu(cpu_data, cpuid);
 
 	cpu_info->loops_per_jiffy = loops_per_jiffy;
+	cpu_info->cpuid = read_cpuid_id();
 
 	store_cpu_topology(cpuid);
 }