Linux Virtualization - Jun 2008 - [PATCH] ia64/xen: introduce synch bitops which is necessary for ia64/xen support.

define sync bitops which is necessary for ia64/xen.

Cc: Robin Holt <holt at sgi.com>
Cc: Jeremy Fitzhardinge <jeremy at goop.org>
Signed-off-by: Isaku Yamahata <yamahata at valinux.co.jp>
Cc: "Luck, Tony" <tony.luck at intel.com>
---
 include/asm-ia64/sync_bitops.h |   50 ++++++++++++++++++++++++++++++++++++++++
 1 files changed, 50 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..8d4b9af
--- /dev/null
+++ b/include/asm-ia64/sync_bitops.h
@@ -0,0 +1,50 @@
+#ifndef _ASM_IA64_SYNC_BITOPS_H
+#define _ASM_IA64_SYNC_BITOPS_H
+
+/*
+ * Copyright (C) 2008 Isaku Yamahata <yamahata at valinux co jp>
+ *
+ * Based on synch_bitops.h which Dan Magenhaimer wrote.
+ *
+ * bit operations which 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_test_bit(int nr, const volatile void *addr)
+{
+	return test_bit(nr, addr);
+}
+
+#define sync_cmpxchg(ptr, old, new) cmpxchg_acq((ptr), (old), (new))
+
+#endif /* _ASM_IA64_SYNC_BITOPS_H */
-- 
1.5.3



-- 
yamahata