1 files changed, 22 insertions, 16 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 04c662ba18f..38988491c62 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -86,6 +86,7 @@ void *x86_bios_cpu_apicid_early_ptr;
 
 #ifdef CONFIG_X86_32
 u8 apicid_2_node[MAX_APICID];
+static int low_mappings;
 #endif
 
 /* State of each CPU */
@@ -299,7 +300,7 @@ static void __cpuinit smp_callin(void)
 /*
  * Activate a secondary processor.
  */
-void __cpuinit start_secondary(void *unused)
+static void __cpuinit start_secondary(void *unused)
 {
 	/*
 	 * Don't put *anything* before cpu_init(), SMP booting is too
@@ -326,6 +327,12 @@ void __cpuinit start_secondary(void *unused)
 		enable_8259A_irq(0);
 	}
 
+#ifdef CONFIG_X86_32
+	while (low_mappings)
+		cpu_relax();
+	__flush_tlb_all();
+#endif
+
 	/* This must be done before setting cpu_online_map */
 	set_cpu_sibling_map(raw_smp_processor_id());
 	wmb();
@@ -1040,14 +1047,20 @@ int __cpuinit native_cpu_up(unsigned int cpu)
 #ifdef CONFIG_X86_32
 	/* init low mem mapping */
 	clone_pgd_range(swapper_pg_dir, swapper_pg_dir + KERNEL_PGD_BOUNDARY,
-			min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
+		min_t(unsigned long, KERNEL_PGD_PTRS, KERNEL_PGD_BOUNDARY));
 	flush_tlb_all();
-#endif
+	low_mappings = 1;
+
+	err = do_boot_cpu(apicid, cpu);
 
+	zap_low_mappings();
+	low_mappings = 0;
+#else
 	err = do_boot_cpu(apicid, cpu);
-	if (err < 0) {
+#endif
+	if (err) {
 		Dprintk("do_boot_cpu failed %d\n", err);
-		return err;
+		return -EIO;
 	}
 
 	/*
@@ -1149,14 +1162,10 @@ static int __init smp_sanity_check(unsigned max_cpus)
 				 "forcing use of dummy APIC emulation.\n");
 		smpboot_clear_io_apic();
 #ifdef CONFIG_X86_32
-		if (nmi_watchdog == NMI_LOCAL_APIC) {
-			printk(KERN_INFO "activating minimal APIC for"
-					 "NMI watchdog use.\n");
-			connect_bsp_APIC();
-			setup_local_APIC();
-			end_local_APIC_setup();
-		}
+		connect_bsp_APIC();
 #endif
+		setup_local_APIC();
+		end_local_APIC_setup();
 		return -1;
 	}
 
@@ -1263,9 +1272,6 @@ void __init native_smp_cpus_done(unsigned int max_cpus)
 	setup_ioapic_dest();
 #endif
 	check_nmi_watchdog();
-#ifdef CONFIG_X86_32
-	zap_low_mappings();
-#endif
 }
 
 #ifdef CONFIG_HOTPLUG_CPU
@@ -1310,7 +1316,7 @@ static void remove_siblinginfo(int cpu)
 	cpu_clear(cpu, cpu_sibling_setup_map);
 }
 
-int additional_cpus __initdata = -1;
+static int additional_cpus __initdata = -1;
 
 static __init int setup_additional_cpus(char *s)
 {