1 files changed, 26 insertions, 20 deletions

diff --git a/init/main.c b/init/main.c
index 5f2ec2cdd900..e97fadeec856 100644
--- a/init/main.c
+++ b/init/main.c
@@ -65,11 +65,9 @@
 #include <linux/ftrace.h>
 #include <linux/async.h>
 #include <linux/kmemcheck.h>
-#include <linux/kmemtrace.h>
 #include <linux/sfi.h>
 #include <linux/shmem_fs.h>
 #include <linux/slab.h>
-#include <trace/boot.h>
 
 #include <asm/io.h>
 #include <asm/bugs.h>
@@ -124,7 +122,9 @@ static char *ramdisk_execute_command;
 
 #ifdef CONFIG_SMP
 /* Setup configured maximum number of CPUs to activate */
-unsigned int __initdata setup_max_cpus = NR_CPUS;
+unsigned int setup_max_cpus = NR_CPUS;
+EXPORT_SYMBOL(setup_max_cpus);
+
 
 /*
  * Setup routine for controlling SMP activation
@@ -421,18 +421,26 @@ static void __init setup_command_line(char *command_line)
  * gcc-3.4 accidentally inlines this function, so use noinline.
  */
 
+static __initdata DECLARE_COMPLETION(kthreadd_done);
+
 static noinline void __init_refok rest_init(void)
         __releases(kernel_lock)
 {
         int pid;
 
         rcu_scheduler_starting();
+        /*
+         * We need to spawn init first so that it obtains pid 1, however
+         * the init task will end up wanting to create kthreads, which, if
+         * we schedule it before we create kthreadd, will OOPS.
+         */
         kernel_thread(kernel_init, NULL, CLONE_FS | CLONE_SIGHAND);
         numa_default_policy();
         pid = kernel_thread(kthreadd, NULL, CLONE_FS | CLONE_FILES);
         rcu_read_lock();
         kthreadd_task = find_task_by_pid_ns(pid, &init_pid_ns);
         rcu_read_unlock();
+        complete(&kthreadd_done);
         unlock_kernel();
 
         /*
@@ -521,6 +529,7 @@ static void __init mm_init(void)
         page_cgroup_init_flatmem();
         mem_init();
         kmem_cache_init();
+        percpu_init_late();
         pgtable_cache_init();
         vmalloc_init();
 }
@@ -652,7 +661,6 @@ asmlinkage void __init start_kernel(void)
 #endif
         page_cgroup_init();
         enable_debug_pagealloc();
-        kmemtrace_init();
         kmemleak_init();
         debug_objects_mem_init();
         idr_init_cache();
@@ -714,38 +722,33 @@ int initcall_debug;
 core_param(initcall_debug, initcall_debug, bool, 0644);
 
 static char msgbuf[64];
-static struct boot_trace_call call;
-static struct boot_trace_ret ret;
 
 int do_one_initcall(initcall_t fn)
 {
         int count = preempt_count();
         ktime_t calltime, delta, rettime;
+        unsigned long long duration;
+        int ret;
 
         if (initcall_debug) {
-                call.caller = task_pid_nr(current);
-                printk("calling  %pF @ %i\n", fn, call.caller);
+                printk("calling  %pF @ %i\n", fn, task_pid_nr(current));
                 calltime = ktime_get();
-                trace_boot_call(&call, fn);
-                enable_boot_trace();
         }
 
-        ret.result = fn();
+        ret = fn();
 
         if (initcall_debug) {
-                disable_boot_trace();
                 rettime = ktime_get();
                 delta = ktime_sub(rettime, calltime);
-                ret.duration = (unsigned long long) ktime_to_ns(delta) >> 10;
-                trace_boot_ret(&ret, fn);
-                printk("initcall %pF returned %d after %Ld usecs\n", fn,
-                        ret.result, ret.duration);
+                duration = (unsigned long long) ktime_to_ns(delta) >> 10;
+                printk("initcall %pF returned %d after %lld usecs\n", fn,
+                        ret, duration);
         }
 
         msgbuf[0] = 0;
 
-        if (ret.result && ret.result != -ENODEV && initcall_debug)
-                sprintf(msgbuf, "error code %d ", ret.result);
+        if (ret && ret != -ENODEV && initcall_debug)
+                sprintf(msgbuf, "error code %d ", ret);
 
         if (preempt_count() != count) {
                 strlcat(msgbuf, "preemption imbalance ", sizeof(msgbuf));
@@ -759,7 +762,7 @@ int do_one_initcall(initcall_t fn)
                 printk("initcall %pF returned with %s\n", fn, msgbuf);
         }
 
-        return ret.result;
+        return ret;
 }
 
 
@@ -853,6 +856,10 @@ static noinline int init_post(void)
 
 static int __init kernel_init(void * unused)
 {
+        /*
+         * Wait until kthreadd is all set-up.
+         */
+        wait_for_completion(&kthreadd_done);
         lock_kernel();
 
         /*
@@ -878,7 +885,6 @@ static int __init kernel_init(void * unused)
         smp_prepare_cpus(setup_max_cpus);
 
         do_pre_smp_initcalls();
-        start_boot_trace();
 
         smp_init();
         sched_init_smp();