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smp: Use nr_cpus= to set nr_cpu_ids early

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On x86, before prefill_possible_map(), nr_cpu_ids will be NR_CPUS aka
CONFIG_NR_CPUS.

Add nr_cpus= to set nr_cpu_ids. so we can simulate cpus <=8 are installed on
normal config.

-v2: accordging to Christoph, acpi_numa_init should use nr_cpu_ids in stead of
     NR_CPUS.
-v3: add doc in kernel-parameters.txt according to Andrew.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
LKML-Reference: <1265793639-15071-34-git-send-email-yinghai@kernel.org>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
Cc: Tony Luck <tony.luck@intel.com>
This commit is contained in:
Yinghai Lu
2010-02-10 01:20:37 -08:00
committed by H. Peter Anvin
parent 6738762d73
commit 2b633e3fac
5 changed files with 28 additions and 7 deletions
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7
arch/x86/kernel/smpboot.c
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@ -1213,11 +1213,12 @@ __init void prefill_possible_map(void)
total_cpus = max_t(int, possible, num_processors + disabled_cpus);
if (possible > CONFIG_NR_CPUS) {
/* nr_cpu_ids could be reduced via nr_cpus= */
if (possible > nr_cpu_ids) {
printk(KERN_WARNING
"%d Processors exceeds NR_CPUS limit of %d\n",
possible, CONFIG_NR_CPUS);
possible = CONFIG_NR_CPUS;
possible, nr_cpu_ids);
possible = nr_cpu_ids;
}
printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",