[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>

1 files changed, 8 insertions, 3 deletions

diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 7e57c31670a3..d1d92b441fb7 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -129,14 +129,19 @@ asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
         unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
         int val2 = 0;
 
-        if (utime && (op == FUTEX_WAIT)) {
+        if (utime && (op == FUTEX_WAIT || op == FUTEX_LOCK_PI)) {
                 if (get_compat_timespec(&t, utime))
                         return -EFAULT;
                 if (!timespec_valid(&t))
                         return -EINVAL;
-                timeout = timespec_to_jiffies(&t) + 1;
+                if (op == FUTEX_WAIT)
+                        timeout = timespec_to_jiffies(&t) + 1;
+                else {
+                        timeout = t.tv_sec;
+                        val2 = t.tv_nsec;
+                }
         }
-        if (op >= FUTEX_REQUEUE)
+        if (op == FUTEX_REQUEUE || op == FUTEX_CMP_REQUEUE)
                 val2 = (int) (unsigned long) utime;
 
         return do_futex(uaddr, op, val, timeout, uaddr2, val2, val3);