ia64/xen: introduce synch bitops which is necessary for ia64/xen supp

define sync bitops which is necessary for ia64/xen.

Cc: Robin Holt <holtsgi.com>
Cc: Jeremy Fitzhardinge <jeremygoop.org>
Signed-off-by: Isaku Yamahata <yamahatavalinux.co.jp>
---
 include/asm-ia64/sync_bitops.h |   57
++++++++++++++++++++++++++++++++++++++++
 1 files changed, 57 insertions(+), 0 deletions(-)
 create mode 100644 include/asm-ia64/sync_bitops.h

diff --git a/include/asm-ia64/sync_bitops.h
b/include/asm-ia64/sync_bitops.h
new file mode 100644
index 0000000..27dc777
--- /dev/null
+++ b/include/asm-ia64/sync_bitops.h
 -0,0
+1,57 
+#ifndef _ASM_IA64_SYNC_BITOPS_H
+#define _ASM_IA64_SYNC_BITOPS_H
+
+/*
+ * Copyright 1992, Linus Torvalds.
+ * Heavily modified to provide guaranteed strong
synchronisation
+ * when communicating with Xen or other guest OSes running
on other CPUs.
+ */
+
+static inline void sync_set_bit(int nr, volatile void
*addr)
+{
+	set_bit(nr, addr);
+}
+
+static inline void sync_clear_bit(int nr, volatile void
*addr)
+{
+	clear_bit(nr, addr);
+}
+
+static inline void sync_change_bit(int nr, volatile void
*addr)
+{
+	change_bit(nr, addr);
+}
+
+static inline int sync_test_and_set_bit(int nr, volatile
void *addr)
+{
+	return test_and_set_bit(nr, addr);
+}
+
+static inline int sync_test_and_clear_bit(int nr, volatile
void *addr)
+{
+	return test_and_clear_bit(nr, addr);
+}
+
+static inline int sync_test_and_change_bit(int nr, volatile
void *addr)
+{
+	return test_and_change_bit(nr, addr);
+}
+
+static inline int sync_const_test_bit(int nr, const
volatile void *addr)
+{
+	return test_bit(nr, addr);
+}
+
+static inline int sync_var_test_bit(int nr, volatile void
*addr)
+{
+	return test_bit(nr, addr);
+}
+
+#define sync_cmpxchg(ptr, old, new) cmpxchg_acq((ptr),
(old), (new))
+
+#define sync_test_bit(nr,addr)			
+	(__builtin_constant_p(nr) ?		
+	 sync_const_test_bit((nr), (addr)) :	
+	 sync_var_test_bit((nr), (addr)))
+
+#endif /* _ASM_IA64_SYNC_BITOPS_H */
-- 
1.5.3


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