1 files changed, 14 insertions, 6 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index a32da804252e..34826934d4a7 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -122,8 +122,9 @@ static void smp_callin(void)
          * Since CPU0 is not wakened up by INIT, it doesn't wait for the IPI.
          */
         cpuid = smp_processor_id();
-        if (apic->wait_for_init_deassert && cpuid != 0)
-                apic->wait_for_init_deassert(&init_deasserted);
+        if (apic->wait_for_init_deassert && cpuid)
+                while (!atomic_read(&init_deasserted))
+                        cpu_relax();
 
         /*
          * (This works even if the APIC is not enabled.)
@@ -701,11 +702,15 @@ wakeup_cpu_via_init_nmi(int cpu, unsigned long start_ip, int apicid,
         int id;
         int boot_error;
 
+        preempt_disable();
+
         /*
          * Wake up AP by INIT, INIT, STARTUP sequence.
          */
-        if (cpu)
-                return wakeup_secondary_cpu_via_init(apicid, start_ip);
+        if (cpu) {
+                boot_error = wakeup_secondary_cpu_via_init(apicid, start_ip);
+                goto out;
+        }
 
         /*
          * Wake up BSP by nmi.
@@ -725,6 +730,9 @@ wakeup_cpu_via_init_nmi(int cpu, unsigned long start_ip, int apicid,
                 boot_error = wakeup_secondary_cpu_via_nmi(id, start_ip);
         }
 
+out:
+        preempt_enable();
+
         return boot_error;
 }
 
@@ -758,10 +766,10 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
 #else
         clear_tsk_thread_flag(idle, TIF_FORK);
         initial_gs = per_cpu_offset(cpu);
+#endif
         per_cpu(kernel_stack, cpu) =
                 (unsigned long)task_stack_page(idle) -
                 KERNEL_STACK_OFFSET + THREAD_SIZE;
-#endif
         early_gdt_descr.address = (unsigned long)get_cpu_gdt_table(cpu);
         initial_code = (unsigned long)start_secondary;
         stack_start  = idle->thread.sp;
@@ -1379,7 +1387,7 @@ static inline void mwait_play_dead(void)
 
         if (!this_cpu_has(X86_FEATURE_MWAIT))
                 return;
-        if (!this_cpu_has(X86_FEATURE_CLFLSH))
+        if (!this_cpu_has(X86_FEATURE_CLFLUSH))
                 return;
         if (__this_cpu_read(cpu_info.cpuid_level) < CPUID_MWAIT_LEAF)
                 return;