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[PATCH] s390: possible_cpus parameter
Introduce possible_cpus command line option. Hard sets the number of bits set in cpu_possible_map. Unlike the additional_cpus parameter this one guarantees that num_possible_cpus() will stay constant even if the system gets rebooted and a different number of cpus are present at startup. Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -58,6 +58,12 @@ mark such hot-pluggable cpus as disabled entries, one could use this
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parameter "additional_cpus=x" to represent those cpus in the cpu_possible_map.
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possible_cpus=n [s390 only] use this to set hotpluggable cpus.
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This option sets possible_cpus bits in
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cpu_possible_map. Thus keeping the numbers of bits set
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constant even if the machine gets rebooted.
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This option overrides additional_cpus.
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CPU maps and such
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-----------------
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[More on cpumaps and primitive to manipulate, please check
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@ -673,15 +673,16 @@ __cpu_up(unsigned int cpu)
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}
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static unsigned int __initdata additional_cpus;
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static unsigned int __initdata possible_cpus;
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void __init smp_setup_cpu_possible_map(void)
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{
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unsigned int pcpus, cpu;
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pcpus = smp_count_cpus() + additional_cpus;
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pcpus = min(smp_count_cpus() + additional_cpus, (unsigned int) NR_CPUS);
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if (pcpus > NR_CPUS)
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pcpus = NR_CPUS;
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if (possible_cpus)
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pcpus = min(possible_cpus, (unsigned int) NR_CPUS);
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for (cpu = 0; cpu < pcpus; cpu++)
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cpu_set(cpu, cpu_possible_map);
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@ -698,6 +699,13 @@ static int __init setup_additional_cpus(char *s)
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}
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early_param("additional_cpus", setup_additional_cpus);
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static int __init setup_possible_cpus(char *s)
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{
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possible_cpus = simple_strtoul(s, NULL, 0);
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return 0;
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}
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early_param("possible_cpus", setup_possible_cpus);
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int
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__cpu_disable(void)
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{
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