x86-32, mm: Add an initial page table for core bootstrapping

[pandora-kernel.git] / arch / x86 / kernel / smpboot.c

diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index a5e928b..e63bb51 100644 (file)
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -62,7 +62,6 @@
 #include <asm/pgtable.h>
 #include <asm/tlbflush.h>
 #include <asm/mtrr.h>
-#include <asm/vmi.h>
 #include <asm/apic.h>
 #include <asm/setup.h>
 #include <asm/uv/uv.h>
@@ -73,7 +72,6 @@
 
 #ifdef CONFIG_X86_32
 u8 apicid_2_node[MAX_APICID];
-static int low_mappings;
 #endif
 
 /* State of each CPU */
@@ -91,6 +89,25 @@ DEFINE_PER_CPU(int, cpu_state) = { 0 };
 static DEFINE_PER_CPU(struct task_struct *, idle_thread_array);
 #define get_idle_for_cpu(x)      (per_cpu(idle_thread_array, x))
 #define set_idle_for_cpu(x, p)   (per_cpu(idle_thread_array, x) = (p))
+
+/*
+ * We need this for trampoline_base protection from concurrent accesses when
+ * off- and onlining cores wildly.
+ */
+static DEFINE_MUTEX(x86_cpu_hotplug_driver_mutex);
+
+void cpu_hotplug_driver_lock()
+{
+        mutex_lock(&x86_cpu_hotplug_driver_mutex);
+}
+
+void cpu_hotplug_driver_unlock()
+{
+        mutex_unlock(&x86_cpu_hotplug_driver_mutex);
+}
+
+ssize_t arch_cpu_probe(const char *buf, size_t count) { return -1; }
+ssize_t arch_cpu_release(const char *buf, size_t count) { return -1; }
 #else
 static struct task_struct *idle_thread_array[NR_CPUS] __cpuinitdata ;
 #define get_idle_for_cpu(x)      (idle_thread_array[(x)])
@@ -281,11 +298,16 @@ notrace static void __cpuinit start_secondary(void *unused)
         * fragile that we want to limit the things done here to the
         * most necessary things.
         */
-       vmi_bringup();
        cpu_init();
        preempt_disable();
        smp_callin();
 
+#ifdef CONFIG_X86_32
+       /* switch away from the initial page table */
+       load_cr3(swapper_pg_dir);
+       __flush_tlb_all();
+#endif
+
        /* otherwise gcc will move up smp_processor_id before the cpu_init */
        barrier();
        /*
@@ -299,12 +321,6 @@ notrace static void __cpuinit start_secondary(void *unused)
                legacy_pic->chip->unmask(0);
        }
 
-#ifdef CONFIG_X86_32
-       while (low_mappings)
-               cpu_relax();
-       __flush_tlb_all();
-#endif
-
        /* This must be done before setting cpu_online_mask */
        set_cpu_sibling_map(raw_smp_processor_id());
        wmb();
@@ -897,20 +913,7 @@ int __cpuinit native_cpu_up(unsigned int cpu)
 
        per_cpu(cpu_state, cpu) = CPU_UP_PREPARE;
 
-#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));
-       flush_tlb_all();
-       low_mappings = 1;
-
-       err = do_boot_cpu(apicid, cpu);
-
-       zap_low_mappings(false);
-       low_mappings = 0;
-#else
        err = do_boot_cpu(apicid, cpu);
-#endif
        if (err) {
                pr_debug("do_boot_cpu failed %d\n", err);
                return -EIO;