RISC-V: Implement nosmp commandline option. (ab3d2650) · Commits · 戴 / test

nosmp command line option sets max_cpus to zero. No secondary harts will boot if this is enabled. But present cpu mask will still point to all possible masks. Fix present cpu mask for nosmp usecase. Signed-off-by:

Atish Patra <atish.patra@wdc.com> Reviewed-by:

Christoph Hellwig <hch@lst.de> Signed-off-by:

Palmer Dabbelt <palmer@sifive.com>

arch/riscv/kernel/smpboot.c

+11 −1

Original line number	Diff line number	Diff line
		@@ -47,6 +47,17 @@ void __init smp_prepare_boot_cpu(void)

		void __init smp_prepare_cpus(unsigned int max_cpus)
		{
		int cpuid;

		/* This covers non-smp usecase mandated by "nosmp" option */
		if (max_cpus == 0)
		return;

		for_each_possible_cpu(cpuid) {
		if (cpuid == smp_processor_id())
		continue;
		set_cpu_present(cpuid, true);
		}
		}

		void __init setup_smp(void)
		@@ -74,7 +85,6 @@ void __init setup_smp(void)

		cpuid_to_hartid_map(cpuid) = hart;
		set_cpu_possible(cpuid, true);
		set_cpu_present(cpuid, true);
		cpuid++;
		}

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