[PATCH] pi-futex: futex_lock_pi/futex_unlock_pi support
This adds the actual pi-futex implementation, based on rt-mutexes.
[dino@in.ibm.com: fix an oops-causing race]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Dinakar Guniguntala <dino@in.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
diff --git a/include/linux/futex.h b/include/linux/futex.h
index f05a3f4..34c3a21 100644
--- a/include/linux/futex.h
+++ b/include/linux/futex.h
@@ -12,6 +12,9 @@
#define FUTEX_REQUEUE 3
#define FUTEX_CMP_REQUEUE 4
#define FUTEX_WAKE_OP 5
+#define FUTEX_LOCK_PI 6
+#define FUTEX_UNLOCK_PI 7
+#define FUTEX_TRYLOCK_PI 8
/*
* Support for robust futexes: the kernel cleans up held futexes at
@@ -97,10 +100,14 @@
#ifdef CONFIG_FUTEX
extern void exit_robust_list(struct task_struct *curr);
+extern void exit_pi_state_list(struct task_struct *curr);
#else
static inline void exit_robust_list(struct task_struct *curr)
{
}
+static inline void exit_pi_state_list(struct task_struct *curr)
+{
+}
#endif
#define FUTEX_OP_SET 0 /* *(int *)UADDR2 = OPARG; */