On MIPS currently, only the soft limit of cpu count (maxcpus) has its
effect, this patch enable the hard limit (nr_cpus) as well. Processor
cores which greater than maxcpus and less than nr_cpus can be taken up
via cpu hotplug. The code is borrowed from X86.
Signed-off-by: Huacai Chen <chenhc@xxxxxxxxxx>
---
arch/mips/kernel/setup.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index a842154..7ffda01 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -729,6 +729,23 @@ static void __init resource_init(void)
}
}
+static void __init prefill_possible_map(void)
+{
+#ifdef CONFIG_SMP
+ int i, possible = num_possible_cpus();
+
+ if (possible > nr_cpu_ids)
+ possible = nr_cpu_ids;
+
+ for (i = 0; i < possible; i++)
+ set_cpu_possible(i, true);
+ for (; i < NR_CPUS; i++)
+ set_cpu_possible(i, false);
+
+ nr_cpu_ids = possible;
+#endif
+}
+
void __init setup_arch(char **cmdline_p)
{
cpu_probe();
@@ -752,6 +769,7 @@ void __init setup_arch(char **cmdline_p)
resource_init();
plat_smp_setup();
+ prefill_possible_map();
cpu_cache_init();
}
--
1.7.7.3
