Merge branch 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 fixes from Peter Anvin:
 "A significantly larger than I'd like set of patches for just below the
  wire.  All of these, however, fix real problems.

  The one thing that is genuinely scary in here is the change of SMP
  initialization, but that *does* fix a confirmed hang when booting
  virtual machines.

  There is also a patch to actually do the right thing about not
  offlining a CPU when there are not enough interrupt vectors available
  in the system; the accounting was done incorrectly.  The worst case
  for that patch is that we fail to offline CPUs when we should (the new
  code is strictly more conservative than the old), so is not
  particularly risky.

  Most of the rest is minor stuff; the EFI patches are all about
  exporting correct information to boot loaders and kexec"

* 'x86/urgent' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/boot: EFI_MIXED should not prohibit loading above 4G
  x86/smpboot: Initialize secondary CPU only if master CPU will wait for it
  x86/smpboot: Log error on secondary CPU wakeup failure at ERR level
  x86: Fix list/memory corruption on CPU hotplug
  x86: irq: Get correct available vectors for cpu disable
  x86/efi: Do not export efi runtime map in case old map
  x86/efi: earlyprintk=efi,keep fix

1 files changed, 32 insertions, 72 deletions

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index 34826934d4a7..bc52fac39dd3 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -111,7 +111,6 @@ atomic_t init_deasserted;
 static void smp_callin(void)
 {
         int cpuid, phys_id;
-        unsigned long timeout;
 
         /*
          * If waken up by an INIT in an 82489DX configuration
@@ -130,37 +129,6 @@ static void smp_callin(void)
          * (This works even if the APIC is not enabled.)
          */
         phys_id = read_apic_id();
-        if (cpumask_test_cpu(cpuid, cpu_callin_mask)) {
-                panic("%s: phys CPU#%d, CPU#%d already present??\n", __func__,
-                                        phys_id, cpuid);
-        }
-        pr_debug("CPU#%d (phys ID: %d) waiting for CALLOUT\n", cpuid, phys_id);
-
-        /*
-         * STARTUP IPIs are fragile beasts as they might sometimes
-         * trigger some glue motherboard logic. Complete APIC bus
-         * silence for 1 second, this overestimates the time the
-         * boot CPU is spending to send the up to 2 STARTUP IPIs
-         * by a factor of two. This should be enough.
-         */
-
-        /*
-         * Waiting 2s total for startup (udelay is not yet working)
-         */
-        timeout = jiffies + 2*HZ;
-        while (time_before(jiffies, timeout)) {
-                /*
-                 * Has the boot CPU finished it's STARTUP sequence?
-                 */
-                if (cpumask_test_cpu(cpuid, cpu_callout_mask))
-                        break;
-                cpu_relax();
-        }
-
-        if (!time_before(jiffies, timeout)) {
-                panic("%s: CPU%d started up but did not get a callout!\n",
-                      __func__, cpuid);
-        }
 
         /*
          * the boot CPU has finished the init stage and is spinning
@@ -750,8 +718,8 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
         unsigned long start_ip = real_mode_header->trampoline_start;
 
         unsigned long boot_error = 0;
-        int timeout;
         int cpu0_nmi_registered = 0;
+        unsigned long timeout;
 
         /* Just in case we booted with a single CPU. */
         alternatives_enable_smp();
@@ -799,6 +767,15 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
         }
 
         /*
+         * AP might wait on cpu_callout_mask in cpu_init() with
+         * cpu_initialized_mask set if previous attempt to online
+         * it timed-out. Clear cpu_initialized_mask so that after
+         * INIT/SIPI it could start with a clean state.
+         */
+        cpumask_clear_cpu(cpu, cpu_initialized_mask);
+        smp_mb();
+
+        /*
          * Wake up a CPU in difference cases:
          * - Use the method in the APIC driver if it's defined
          * Otherwise,
@@ -810,58 +787,41 @@ static int do_boot_cpu(int apicid, int cpu, struct task_struct *idle)
                 boot_error = wakeup_cpu_via_init_nmi(cpu, start_ip, apicid,
                                                      &cpu0_nmi_registered);
 
+
         if (!boot_error) {
                 /*
-                 * allow APs to start initializing.
+                 * Wait 10s total for a response from AP
                  */
-                pr_debug("Before Callout %d\n", cpu);
-                cpumask_set_cpu(cpu, cpu_callout_mask);
-                pr_debug("After Callout %d\n", cpu);
+                boot_error = -1;
+                timeout = jiffies + 10*HZ;
+                while (time_before(jiffies, timeout)) {
+                        if (cpumask_test_cpu(cpu, cpu_initialized_mask)) {
+                                /*
+                                 * Tell AP to proceed with initialization
+                                 */
+                                cpumask_set_cpu(cpu, cpu_callout_mask);
+                                boot_error = 0;
+                                break;
+                        }
+                        udelay(100);
+                        schedule();
+                }
+        }
 
+        if (!boot_error) {
                 /*
-                 * Wait 5s total for a response
+                 * Wait till AP completes initial initialization
                  */
-                for (timeout = 0; timeout < 50000; timeout++) {
-                        if (cpumask_test_cpu(cpu, cpu_callin_mask))
-                                break;  /* It has booted */
-                        udelay(100);
+                while (!cpumask_test_cpu(cpu, cpu_callin_mask)) {
                         /*
                          * Allow other tasks to run while we wait for the
                          * AP to come online. This also gives a chance
                          * for the MTRR work(triggered by the AP coming online)
                          * to be completed in the stop machine context.
                          */
+                        udelay(100);
                         schedule();
                 }
-
-                if (cpumask_test_cpu(cpu, cpu_callin_mask)) {
-                        print_cpu_msr(&cpu_data(cpu));
-                        pr_debug("CPU%d: has booted.\n", cpu);
-                } else {
-                        boot_error = 1;
-                        if (*trampoline_status == 0xA5A5A5A5)
-                                /* trampoline started but...? */
-                                pr_err("CPU%d: Stuck ??\n", cpu);
-                        else
-                                /* trampoline code not run */
-                                pr_err("CPU%d: Not responding\n", cpu);
-                        if (apic->inquire_remote_apic)
-                                apic->inquire_remote_apic(apicid);
-                }
-        }
-
-        if (boot_error) {
-                /* Try to put things back the way they were before ... */
-                numa_remove_cpu(cpu); /* was set by numa_add_cpu */
-
-                /* was set by do_boot_cpu() */
-                cpumask_clear_cpu(cpu, cpu_callout_mask);
-
-                /* was set by cpu_init() */
-                cpumask_clear_cpu(cpu, cpu_initialized_mask);
-
-                set_cpu_present(cpu, false);
-                per_cpu(x86_cpu_to_apicid, cpu) = BAD_APICID;
         }
 
         /* mark "stuck" area as not stuck */
@@ -921,7 +881,7 @@ int native_cpu_up(unsigned int cpu, struct task_struct *tidle)
 
         err = do_boot_cpu(apicid, cpu, tidle);
         if (err) {
-                pr_debug("do_boot_cpu failed %d\n", err);
+                pr_err("do_boot_cpu failed(%d) to wakeup CPU#%u\n", err, cpu);
                 return -EIO;
         }