[PATCH] Register the boot-cpu in the cpu maps earlier

Register the boot-cpu in the cpu maps earlier to allow the early printk to
work, and to fix an obscure deadlock at boot.

Signed-off-by: Stas Sergeev <stsp@aknet.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 11 insertions, 6 deletions

diff --git a/init/main.c b/init/main.c
index 4c194c47395f..141e8896d252 100644
--- a/init/main.c
+++ b/init/main.c
@@ -438,6 +438,15 @@ void __init parse_early_param(void)
  *      Activate the first processor.
  */
 
+static void __init boot_cpu_init(void)
+{
+        int cpu = smp_processor_id();
+        /* Mark the boot cpu "present", "online" etc for SMP and UP case */
+        cpu_set(cpu, cpu_online_map);
+        cpu_set(cpu, cpu_present_map);
+        cpu_set(cpu, cpu_possible_map);
+}
+
 asmlinkage void __init start_kernel(void)
 {
         char * command_line;
@@ -447,17 +456,13 @@ asmlinkage void __init start_kernel(void)
  * enable them
  */
         lock_kernel();
+        boot_cpu_init();
         page_address_init();
         printk(KERN_NOTICE);
         printk(linux_banner);
         setup_arch(&command_line);
         setup_per_cpu_areas();
-
-        /*
-         * Mark the boot cpu "online" so that it can call console drivers in
-         * printk() and can access its per-cpu storage.
-         */
-        smp_prepare_boot_cpu();
+        smp_prepare_boot_cpu(); /* arch-specific boot-cpu hooks */
 
         /*
          * Set up the scheduler prior starting any interrupts (such as the