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RISC-V: Implement nosmp commandline option. 

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>
hifive-unleashed-5.2
Atish Patra 2019-04-24 14:47:59 -07:00 committed by Palmer Dabbelt
parent 70114560b2
commit ab3d265005
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GPG Key ID: EF4CA1502CCBAB41
1 changed files with 11 additions and 1 deletions
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12
arch/riscv/kernel/smpboot.c
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@ -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++;
}