Change most LitmusRT spinlock_t in raw_spinlock_t

Adapt to new schema for spinlock:
(tglx 20091217)
spinlock - the weakest one, which might sleep in RT
raw_spinlock - spinlock which always spins even on RT
arch_spinlock - the hardware level architecture dependent implementation

----

Most probably, all the spinlocks changed by this commit will be true
spinning lock (raw_spinlock) in PreemptRT (so hopefully we'll need few
changes when porting Litmmus to PreemptRT).

There are a couple of spinlock that the kernel still defines as
spinlock_t (therefore no changes reported in this commit) that might cause
us troubles:

- wait_queue_t lock is defined as spinlock_t; it is used in:
  * fmlp.c -- sem->wait.lock
  * sync.c -- ts_release.wait.lock

- rwlock_t used in fifo implementation in sched_trace.c
  * this need probably to be changed to something always spinning in RT
    at the expense of increased locking time.

----

This commit also fixes warnings and errors due to the need to include
slab.h when using kmalloc() and friends.

----

This commit does not compile.

1 files changed, 5 insertions, 5 deletions

diff --git a/litmus/litmus.c b/litmus/litmus.c
index e43596a5104c..99714d06eed5 100644
--- a/litmus/litmus.c
+++ b/litmus/litmus.c
@@ -23,7 +23,7 @@
 
 /* Number of RT tasks that exist in the system */
 atomic_t rt_task_count          = ATOMIC_INIT(0);
-static DEFINE_SPINLOCK(task_transition_lock);
+static DEFINE_RAW_SPINLOCK(task_transition_lock);
 /* synchronize plugin switching */
 atomic_t cannot_use_plugin      = ATOMIC_INIT(0);
 
@@ -323,7 +323,7 @@ long litmus_admit_task(struct task_struct* tsk)
         INIT_LIST_HEAD(&tsk_rt(tsk)->list);
 
         /* avoid scheduler plugin changing underneath us */
-        spin_lock_irqsave(&task_transition_lock, flags);
+        raw_spin_lock_irqsave(&task_transition_lock, flags);
 
         /* allocate heap node for this task */
         tsk_rt(tsk)->heap_node = bheap_node_alloc(GFP_ATOMIC);
@@ -350,7 +350,7 @@ long litmus_admit_task(struct task_struct* tsk)
         }
 
 out_unlock:
-        spin_unlock_irqrestore(&task_transition_lock, flags);
+        raw_spin_unlock_irqrestore(&task_transition_lock, flags);
 out:
         return retval;
 }
@@ -396,7 +396,7 @@ int switch_sched_plugin(struct sched_plugin* plugin)
         smp_call_function(synch_on_plugin_switch, NULL, 0);
 
         /* stop task transitions */
-        spin_lock_irqsave(&task_transition_lock, flags);
+        raw_spin_lock_irqsave(&task_transition_lock, flags);
 
         /* don't switch if there are active real-time tasks */
         if (atomic_read(&rt_task_count) == 0) {
@@ -414,7 +414,7 @@ int switch_sched_plugin(struct sched_plugin* plugin)
         } else
                 ret = -EBUSY;
 out:
-        spin_unlock_irqrestore(&task_transition_lock, flags);
+        raw_spin_unlock_irqrestore(&task_transition_lock, flags);
         atomic_set(&cannot_use_plugin, 0);
         return ret;
 }