spinlock: try lock for use in interrupt

Signed-off-by: Sandro Rüegge <[email protected]>

Author: sparchatus

include/spinlock.h

@@ -37,9 +37,14 @@ typedef volatile unsigned int spinlock_t;
 
 /* Static declarations */
 
+static inline bool spin_try_lock(spinlock_t *lock) {
+    ASSERT(lock);
+    return atomic_test_and_set_bit(LOCK_BIT, lock);
+}
+
 static inline void spin_lock(spinlock_t *lock) {
     ASSERT(lock);
-    while (atomic_test_and_set_bit(LOCK_BIT, lock))
+    while (spin_try_lock(lock))
         cpu_relax();
 }