ARM: kernel: smp_setup_processor_id() updates (cb8cf4f8) · Commits · 戴 / test

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

+4 −3

Original line number	Diff line number	Diff line
		@@ -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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