[patch 3/5] lightweight robust futexes: arch defaults

[Ingo Molnar <mingo@elte.hu>]

add placeholder futex_atomic_cmpxchg_inuser() implementations to every
architecture that supports futexes. It returns -ENOSYS.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Arjan van de Ven <arjan@infradead.org>
Acked-by: Ulrich Drepper <drepper@redhat.com>

----

 include/asm-frv/futex.h     |    6 ++++++
 include/asm-generic/futex.h |    6 ++++++
 include/asm-mips/futex.h    |    6 ++++++
 include/asm-powerpc/futex.h |    6 ++++++
 4 files changed, 24 insertions(+)

Index: linux-robust-list.q/include/asm-frv/futex.h
===================================================================
--- linux-robust-list.q.orig/include/asm-frv/futex.h
+++ linux-robust-list.q/include/asm-frv/futex.h
@@ -9,5 +9,11 @@
 
 extern int futex_atomic_op_inuser(int encoded_op, int __user *uaddr);
 
+static inline int
+futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval)
+{
+	return -ENOSYS;
+}
+
 #endif
 #endif
Index: linux-robust-list.q/include/asm-generic/futex.h
===================================================================
--- linux-robust-list.q.orig/include/asm-generic/futex.h
+++ linux-robust-list.q/include/asm-generic/futex.h
@@ -49,5 +49,11 @@ futex_atomic_op_inuser (int encoded_op, 
 	return ret;
 }
 
+static inline int
+futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval)
+{
+	return -ENOSYS;
+}
+
 #endif
 #endif
Index: linux-robust-list.q/include/asm-mips/futex.h
===================================================================
--- linux-robust-list.q.orig/include/asm-mips/futex.h
+++ linux-robust-list.q/include/asm-mips/futex.h
@@ -99,5 +99,11 @@ futex_atomic_op_inuser (int encoded_op, 
 	return ret;
 }
 
+static inline int
+futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval)
+{
+	return -ENOSYS;
+}
+
 #endif
 #endif
Index: linux-robust-list.q/include/asm-powerpc/futex.h
===================================================================
--- linux-robust-list.q.orig/include/asm-powerpc/futex.h
+++ linux-robust-list.q/include/asm-powerpc/futex.h
@@ -81,5 +81,11 @@ static inline int futex_atomic_op_inuser
 	return ret;
 }
 
+static inline int
+futex_atomic_cmpxchg_inuser(int __user *uaddr, int oldval, int newval)
+{
+	return -ENOSYS;
+}
+
 #endif /* __KERNEL__ */
 #endif /* _ASM_POWERPC_FUTEX_H */
-
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