From 48fa072fe980f347934f378a87ea11fb8857cb92 Mon Sep 17 00:00:00 2001
From: Kyle McMartin <kyle@shortfin.cabal.ca>
Date: Sat, 1 Mar 2008 10:25:52 -0800
Subject: [PATCH] --- yaml --- r: 87407 b: refs/heads/master c:
 c20a84c91048c76c1379011c96b1a5cee5c7d9a0 h: refs/heads/master i:   87405:
 001ecb36437690f768123a86285db2c6a876b7cc   87403:
 fa6e5b6e885ddd3d951196b1a78cba1bf23fd5d8   87399:
 387d32408746a020818985b2d95774d704a980e5   87391:
 ab99768d75ab83548794972c037b6ba9d3f7624d v: v3

---
 [refs]                           |  2 +-
 trunk/include/asm-parisc/futex.h | 10 ++++++++--
 2 files changed, 9 insertions(+), 3 deletions(-)

diff --git a/[refs] b/[refs]
index 9341536bedae..eb706d76e51f 100644
--- a/[refs]
+++ b/[refs]
@@ -1,2 +1,2 @@
 ---
-refs/heads/master: dc39455e7948ec9bc5f3f2dced5c2f5ac8a8dfd9
+refs/heads/master: c20a84c91048c76c1379011c96b1a5cee5c7d9a0
diff --git a/trunk/include/asm-parisc/futex.h b/trunk/include/asm-parisc/futex.h
index dbee6e60aa81..fdc6d055ef7f 100644
--- a/trunk/include/asm-parisc/futex.h
+++ b/trunk/include/asm-parisc/futex.h
@@ -56,6 +56,12 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
 	int err = 0;
 	int uval;
 
+	/* futex.c wants to do a cmpxchg_inatomic on kernel NULL, which is
+	 * our gateway page, and causes no end of trouble...
+	 */
+	if (segment_eq(KERNEL_DS, get_fs()) && !uaddr)
+		return -EFAULT;
+
 	if (!access_ok(VERIFY_WRITE, uaddr, sizeof(int)))
 		return -EFAULT;
 
@@ -67,5 +73,5 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
 	return uval;
 }
 
-#endif
-#endif
+#endif /*__KERNEL__*/
+#endif /*_ASM_PARISC_FUTEX_H*/