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

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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>
This commit is contained in:
Lorenzo Pieralisi 2012-11-06 11:57:43 +00:00
parent 77b67063bb
commit e8d432c9cf
2 changed files with 2 additions and 0 deletions
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1
arch/arm/include/asm/cpu.h
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@ -15,6 +15,7 @@
struct cpuinfo_arm {
struct cpu cpu;
u32 cpuid;
#ifdef CONFIG_SMP
unsigned int loops_per_jiffy;
#endif

1
arch/arm/kernel/smp.c
View File

@ -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);
}