[S390] fix futex_atomic_cmpxchg_inatomic

futex_atomic_cmpxchg_inatomic has the same bug as the other
atomic futex operations: the operation needs to be done in the
user address space, not the kernel address space. Add the missing
sacf 256 & sacf 0.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/include/asm-s390/futex.h b/include/asm-s390/futex.h
index 1802775..ffedf14 100644 (file)
--- a/include/asm-s390/futex.h
+++ b/include/asm-s390/futex.h
@@ -98,9 +98,10 @@ futex_atomic_cmpxchg_inatomic(int __user *uaddr, int oldval, int newval)
 
        if (! access_ok (VERIFY_WRITE, uaddr, sizeof(int)))
                return -EFAULT;
-       asm volatile("   cs   %1,%4,0(%5)\n"
+       asm volatile("   sacf 256\n"
+                    "   cs   %1,%4,0(%5)\n"
                     "0: lr   %0,%1\n"
-                    "1:\n"
+                    "1: sacf 0\n"
 #ifndef __s390x__
                     ".section __ex_table,\"a\"\n"
                     "   .align 4\n"