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authorYinghai Lu <yinghai@kernel.org>2010-02-10 01:20:37 -0800
committerH. Peter Anvin <hpa@zytor.com>2010-02-17 17:30:22 -0800
commit2b633e3fac5efada088b57d31e65401f22bcc18f (patch)
treea5a63de9ef9db656dd9c87c7eaf360762fe69759 /init/main.c
parent6738762d73a237ec322b04d8b9d55c8fd5d84713 (diff)
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smp: Use nr_cpus= to set nr_cpu_ids early
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>
Diffstat (limited to 'init/main.c')
-rw-r--r--init/main.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/init/main.c b/init/main.c
index 845187822e5..05b5283e98f 100644
--- a/init/main.c
+++ b/init/main.c
@@ -149,6 +149,20 @@ static int __init nosmp(char *str)
early_param("nosmp", nosmp);
+/* this is hard limit */
+static int __init nrcpus(char *str)
+{
+ int nr_cpus;
+
+ get_option(&str, &nr_cpus);
+ if (nr_cpus > 0 && nr_cpus < nr_cpu_ids)
+ nr_cpu_ids = nr_cpus;
+
+ return 0;
+}
+
+early_param("nr_cpus", nrcpus);
+
static int __init maxcpus(char *str)
{
get_option(&str, &setup_max_cpus);