x86, ia64, smp: use workqueues unconditionally during do_boot_cpu()

Workqueues are now initialized as part of the early_initcall().  So they
are available for use during cold boot process aswell.

Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Tejun Heo <tj@kernel.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tony Luck <tony.luck@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 6 insertions, 9 deletions

diff --git a/arch/ia64/kernel/smpboot.c b/arch/ia64/kernel/smpboot.c
index 1d85d8cfaa7d..d003b502a432 100644
--- a/arch/ia64/kernel/smpboot.c
+++ b/arch/ia64/kernel/smpboot.c
@@ -508,21 +508,18 @@ do_boot_cpu (int sapicid, int cpu)
                 .done   = COMPLETION_INITIALIZER(c_idle.done),
         };
 
+        /*
+         * We can't use kernel_thread since we must avoid to
+         * reschedule the child.
+         */
         c_idle.idle = get_idle_for_cpu(cpu);
         if (c_idle.idle) {
                 init_idle(c_idle.idle, cpu);
                 goto do_rest;
         }
 
-        /*
-         * We can't use kernel_thread since we must avoid to reschedule the child.
-         */
-        if (!keventd_up())
-                c_idle.work.func(&c_idle.work);
-        else {
-                schedule_work(&c_idle.work);
-                wait_for_completion(&c_idle.done);
-        }
+        schedule_work(&c_idle.work);
+        wait_for_completion(&c_idle.done);
 
         if (IS_ERR(c_idle.idle))
                 panic("failed fork for CPU %d", cpu);