X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;ds=sidebyside;f=kernel%2Ffutex_compat.c;h=ff90f049f8f6de9e5c6a01782bcb09f7df5c4bc8;hb=83f7a2c118833d3738b4d162ea3c17d0bd8ffa94;hp=133d558db452e38b68c664e9560457f7c3902fc9;hpb=c64768a7d671bcde80bca2aed93f9e07edc069c3;p=~andy%2Flinux

diff --git a/kernel/futex_compat.c b/kernel/futex_compat.c
index 133d558db45..ff90f049f8f 100644
--- a/kernel/futex_compat.c
+++ b/kernel/futex_compat.c
@@ -54,6 +54,9 @@ void compat_exit_robust_list(struct task_struct *curr)
 	compat_long_t futex_offset;
 	int rc;
 
+	if (!futex_cmpxchg_enabled)
+		return;
+
 	/*
 	 * Fetch the list head (which was registered earlier, via
 	 * sys_set_robust_list()):
@@ -115,6 +118,9 @@ asmlinkage long
 compat_sys_set_robust_list(struct compat_robust_list_head __user *head,
 			   compat_size_t len)
 {
+	if (!futex_cmpxchg_enabled)
+		return -ENOSYS;
+
 	if (unlikely(len != sizeof(*head)))
 		return -EINVAL;
 
@@ -130,6 +136,9 @@ compat_sys_get_robust_list(int pid, compat_uptr_t __user *head_ptr,
 	struct compat_robust_list_head __user *head;
 	unsigned long ret;
 
+	if (!futex_cmpxchg_enabled)
+		return -ENOSYS;
+
 	if (!pid)
 		head = current->compat_robust_list;
 	else {
@@ -176,7 +185,7 @@ asmlinkage long compat_sys_futex(u32 __user *uaddr, int op, u32 val,
 
 		t = timespec_to_ktime(ts);
 		if (cmd == FUTEX_WAIT)
-			t = ktime_add(ktime_get(), t);
+			t = ktime_add_safe(ktime_get(), t);
 		tp = &t;
 	}
 	if (cmd == FUTEX_REQUEUE || cmd == FUTEX_CMP_REQUEUE)