Merge git://git.kernel.org/pub/scm/linux/kernel/git/sam/kbuild-bugfix

[linux-2.6-omap-h63xx.git] / arch / x86_64 / kernel / smpboot.c

diff --git a/arch/x86_64/kernel/smpboot.c b/arch/x86_64/kernel/smpboot.c
index 2b9ddba61b37a9e675e830b2172854ea565303b3..a28756ef7cef972dcfd8fff90b1f8a7a19ff5e4a 100644 (file)
--- a/arch/x86_64/kernel/smpboot.c
+++ b/arch/x86_64/kernel/smpboot.c
@@ -66,8 +66,6 @@ int smp_num_siblings = 1;
 u8 phys_proc_id[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
 /* core ID of each logical CPU */
 u8 cpu_core_id[NR_CPUS] __read_mostly = { [0 ... NR_CPUS-1] = BAD_APICID };
-EXPORT_SYMBOL(phys_proc_id);
-EXPORT_SYMBOL(cpu_core_id);
 
 /* Bitmask of currently online CPUs */
 cpumask_t cpu_online_map __read_mostly;
@@ -337,7 +335,13 @@ static __cpuinit void sync_tsc(unsigned int master)
 
 static void __cpuinit tsc_sync_wait(void)
 {
-       if (notscsync || !cpu_has_tsc)
+       /*
+        * When the CPU has synchronized TSCs assume the BIOS
+        * or the hardware already synced.  Otherwise we could
+        * mess up a possible perfect synchronization with a
+        * not-quite-perfect algorithm.
+        */
+       if (notscsync || !cpu_has_tsc || !unsynchronized_tsc())
                return;
        sync_tsc(0);
 }
@@ -507,6 +511,7 @@ void __cpuinit start_secondary(void)
         * things done here to the most necessary things.
         */
        cpu_init();
+       preempt_disable();
        smp_callin();
 
        /* otherwise gcc will move up the smp_processor_id before the cpu_init */
@@ -647,6 +652,7 @@ static int __cpuinit wakeup_secondary_via_INIT(int phys_apicid, unsigned int sta
                send_status = apic_read(APIC_ICR) & APIC_ICR_BUSY;
        } while (send_status && (timeout++ < 1000));
 
+       mb();
        atomic_set(&init_deasserted, 1);
 
        num_starts = 2;
@@ -660,7 +666,6 @@ static int __cpuinit wakeup_secondary_via_INIT(int phys_apicid, unsigned int sta
 
        for (j = 1; j <= num_starts; j++) {
                Dprintk("Sending STARTUP #%d.\n",j);
-               apic_read_around(APIC_SPIV);
                apic_write(APIC_ESR, 0);
                apic_read(APIC_ESR);
                Dprintk("After apic_write.\n");
@@ -699,7 +704,6 @@ static int __cpuinit wakeup_secondary_via_INIT(int phys_apicid, unsigned int sta
                 * Due to the Pentium erratum 3AP.
                 */
                if (maxlvt > 3) {
-                       apic_read_around(APIC_SPIV);
                        apic_write(APIC_ESR, 0);
                }
                accept_status = (apic_read(APIC_ESR) & 0xEF);
@@ -744,11 +748,35 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
        };
        DECLARE_WORK(work, do_fork_idle, &c_idle);
 
+       /* allocate memory for gdts of secondary cpus. Hotplug is considered */
+       if (!cpu_gdt_descr[cpu].address &&
+               !(cpu_gdt_descr[cpu].address = get_zeroed_page(GFP_KERNEL))) {
+               printk(KERN_ERR "Failed to allocate GDT for CPU %d\n", cpu);
+               return -1;
+       }
+
+       /* Allocate node local memory for AP pdas */
+       if (cpu_pda(cpu) == &boot_cpu_pda[cpu]) {
+               struct x8664_pda *newpda, *pda;
+               int node = cpu_to_node(cpu);
+               pda = cpu_pda(cpu);
+               newpda = kmalloc_node(sizeof (struct x8664_pda), GFP_ATOMIC,
+                                     node);
+               if (newpda) {
+                       memcpy(newpda, pda, sizeof (struct x8664_pda));
+                       cpu_pda(cpu) = newpda;
+               } else
+                       printk(KERN_ERR
+               "Could not allocate node local PDA for CPU %d on node %d\n",
+                               cpu, node);
+       }
+
+
        c_idle.idle = get_idle_for_cpu(cpu);
 
        if (c_idle.idle) {
                c_idle.idle->thread.rsp = (unsigned long) (((struct pt_regs *)
-                       (THREAD_SIZE + (unsigned long) c_idle.idle->thread_info)) - 1);
+                       (THREAD_SIZE +  task_stack_page(c_idle.idle))) - 1);
                init_idle(c_idle.idle, cpu);
                goto do_rest;
        }
@@ -779,14 +807,14 @@ static int __cpuinit do_boot_cpu(int cpu, int apicid)
 
 do_rest:
 
-       cpu_pda[cpu].pcurrent = c_idle.idle;
+       cpu_pda(cpu)->pcurrent = c_idle.idle;
 
        start_rip = setup_trampoline();
 
        init_rsp = c_idle.idle->thread.rsp;
        per_cpu(init_tss,cpu).rsp0 = init_rsp;
        initial_code = start_secondary;
-       clear_ti_thread_flag(c_idle.idle->thread_info, TIF_FORK);
+       clear_tsk_thread_flag(c_idle.idle, TIF_FORK);
 
        printk(KERN_INFO "Booting processor %d/%d APIC 0x%x\n", cpu,
                cpus_weight(cpu_present_map),
@@ -812,11 +840,8 @@ do_rest:
        /*
         * Be paranoid about clearing APIC errors.
         */
-       if (APIC_INTEGRATED(apic_version[apicid])) {
-               apic_read_around(APIC_SPIV);
-               apic_write(APIC_ESR, 0);
-               apic_read(APIC_ESR);
-       }
+       apic_write(APIC_ESR, 0);
+       apic_read(APIC_ESR);
 
        /*
         * Status is now clean
@@ -928,8 +953,8 @@ int additional_cpus __initdata = -1;
  *
  * Three ways to find out the number of additional hotplug CPUs:
  * - If the BIOS specified disabled CPUs in ACPI/mptables use that.
- * - otherwise use half of the available CPUs or 2, whatever is more.
  * - The user can overwrite it with additional_cpus=NUM
+ * - Otherwise don't reserve additional CPUs.
  * We do this because additional CPUs waste a lot of memory.
  * -AK
  */
@@ -939,13 +964,10 @@ __init void prefill_possible_map(void)
        int possible;
 
        if (additional_cpus == -1) {
-               if (disabled_cpus > 0) {
+               if (disabled_cpus > 0)
                        additional_cpus = disabled_cpus;
-               } else {
-                       additional_cpus = num_processors / 2;
-                       if (additional_cpus == 0)
-                               additional_cpus = 2;
-               }
+               else
+                       additional_cpus = 0;
        }
        possible = num_processors + additional_cpus;
        if (possible > NR_CPUS) 
@@ -997,7 +1019,7 @@ static int __init smp_sanity_check(unsigned max_cpus)
        /*
         * If we couldn't find a local APIC, then get out of here now!
         */
-       if (APIC_INTEGRATED(apic_version[boot_cpu_id]) && !cpu_has_apic) {
+       if (!cpu_has_apic) {
                printk(KERN_ERR "BIOS bug, local APIC #%d not detected!...\n",
                        boot_cpu_id);
                printk(KERN_ERR "... forcing use of dummy APIC emulation. (tell your hw vendor)\n");
@@ -1182,7 +1204,7 @@ int __cpu_disable(void)
        if (cpu == 0)
                return -EBUSY;
 
-       disable_APIC_timer();
+       clear_local_APIC();
 
        /*
         * HACK: