[PATCH] mutex subsystem, core

mutex implementation, core files: just the basic subsystem, no users of it.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>

1 files changed, 35 insertions, 0 deletions

diff --git a/kernel/mutex.h b/kernel/mutex.h
new file mode 100644
index 000000000000..00fe84e7b672
--- /dev/null
+++ b/kernel/mutex.h
@@ -0,0 +1,35 @@
+/*
+ * Mutexes: blocking mutual exclusion locks
+ *
+ * started by Ingo Molnar:
+ *
+ *  Copyright (C) 2004, 2005, 2006 Red Hat, Inc., Ingo Molnar <mingo@redhat.com>
+ *
+ * This file contains mutex debugging related internal prototypes, for the
+ * !CONFIG_DEBUG_MUTEXES case. Most of them are NOPs:
+ */
+
+#define spin_lock_mutex(lock)                   spin_lock(lock)
+#define spin_unlock_mutex(lock)                 spin_unlock(lock)
+#define mutex_remove_waiter(lock, waiter, ti) \
+                __list_del((waiter)->list.prev, (waiter)->list.next)
+
+#define DEBUG_WARN_ON(c)                                do { } while (0)
+#define debug_mutex_set_owner(lock, new_owner)          do { } while (0)
+#define debug_mutex_clear_owner(lock)                   do { } while (0)
+#define debug_mutex_init_waiter(waiter)                 do { } while (0)
+#define debug_mutex_wake_waiter(lock, waiter)           do { } while (0)
+#define debug_mutex_free_waiter(waiter)                 do { } while (0)
+#define debug_mutex_add_waiter(lock, waiter, ti, ip)    do { } while (0)
+#define debug_mutex_unlock(lock)                        do { } while (0)
+#define debug_mutex_init(lock, name)                    do { } while (0)
+
+/*
+ * Return-address parameters/declarations. They are very useful for
+ * debugging, but add overhead in the !DEBUG case - so we go the
+ * trouble of using this not too elegant but zero-cost solution:
+ */
+#define __IP_DECL__
+#define __IP__
+#define __RET_IP__
+