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RISC-V: Support nr_cpus command line option. 

If nr_cpus command line option is set, maximum possible cpu should be
set to that value.

Signed-off-by: Atish Patra <atish.patra@wdc.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Palmer Dabbelt <palmer@sifive.com>
This commit is contained in:
Atish Patra 2019-04-24 14:48:00 -07:00 committed by Palmer Dabbelt
parent ab3d265005
commit 8b4302a442
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GPG Key ID: EF4CA1502CCBAB41
1 changed files with 9 additions and 1 deletions
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10
arch/riscv/kernel/smpboot.c
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@ -84,11 +84,19 @@ void __init setup_smp(void)
}
cpuid_to_hartid_map(cpuid) = hart;
set_cpu_possible(cpuid, true);
cpuid++;
}
BUG_ON(!found_boot_cpu);
if (cpuid > nr_cpu_ids)
pr_warn("Total number of cpus [%d] is greater than nr_cpus option value [%d]\n",
cpuid, nr_cpu_ids);
for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID)
set_cpu_possible(cpuid, true);
}
}
int __cpu_up(unsigned int cpu, struct task_struct *tidle)