3 files changed, 19 insertions, 13 deletions

diff --git a/arch/x86/kernel/mpparse_64.c b/arch/x86/kernel/mpparse_64.c
index 72ab1403fed7..2a1f7881c75b 100644
--- a/arch/x86/kernel/mpparse_64.c
+++ b/arch/x86/kernel/mpparse_64.c
@@ -32,6 +32,7 @@
 
 /* Have we found an MP table */
 int smp_found_config;
+unsigned int __cpuinitdata maxcpus = NR_CPUS;
 
 /*
  * Various Linux-internal data structures created from the
@@ -115,6 +116,12 @@ static void __cpuinit MP_processor_info(struct mpc_config_processor *m)
                 return;
         }
 
+        if (num_processors >= maxcpus) {
+                printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
+                        " Processor ignored.\n", maxcpus);
+                return;
+        }
+
         num_processors++;
         cpus_complement(tmp_map, cpu_present_map);
         cpu = first_cpu(tmp_map);
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index c35cd319d1ed..34c31178041b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -268,3 +268,15 @@ void __cpu_die(unsigned int cpu)
 }
 #endif
 
+/*
+ * If the BIOS enumerates physical processors before logical,
+ * maxcpus=N at enumeration-time can be used to disable HT.
+ */
+static int __init parse_maxcpus(char *arg)
+{
+        extern unsigned int maxcpus;
+
+        maxcpus = simple_strtoul(arg, NULL, 0);
+        return 0;
+}
+early_param("maxcpus", parse_maxcpus);
diff --git a/arch/x86/kernel/smpboot_32.c b/arch/x86/kernel/smpboot_32.c
index 00b1b59cd560..3236e843a9ad 100644
--- a/arch/x86/kernel/smpboot_32.c
+++ b/arch/x86/kernel/smpboot_32.c
@@ -1113,16 +1113,3 @@ void __init smp_intr_init(void)
         /* IPI for generic function call */
         set_intr_gate(CALL_FUNCTION_VECTOR, call_function_interrupt);
 }
-
-/*
- * If the BIOS enumerates physical processors before logical,
- * maxcpus=N at enumeration-time can be used to disable HT.
- */
-static int __init parse_maxcpus(char *arg)
-{
-        extern unsigned int maxcpus;
-
-        maxcpus = simple_strtoul(arg, NULL, 0);
-        return 0;
-}
-early_param("maxcpus", parse_maxcpus);