Define mmiowb() macro if necessary.

diff --git a/include/asm/io.h b/include/asm/io.h
new file mode 100644 (file)
index 0000000..a3e8b20
--- /dev/null
+++ b/include/asm/io.h
@@ -0,0 +1,42 @@
+/*
+ * asm/io.h compatibility header
+ */
+
+#ifndef __COMPAT_ASM_IO_H_
+#define __COMPAT_ASM_IO_H_
+
+#include <linux/config.h>
+
+#include_next <asm/io.h>
+
+#ifndef mmiowb                 /* Defined in 2.6.10 */
+
+#if defined(CONFIG_MIPS)
+
+/* Depends on MIPS II instruction set */
+#define mmiowb() asm volatile ("sync" ::: "memory")
+
+#elif defined(CONFIG_IA64)
+
+/* IA64 */
+#ifdef CONFIG_IA64_SGI_SN2
+#include <asm/sn/io.h>
+#define platform_mmiowb sn_mmiob
+#endif
+
+#ifndef platform_mmiowb
+#define platform_mmiowb ia64_mfa
+#endif
+
+#define mmiowb() platform_mmiowb()
+
+#else
+
+/* Other architectures */
+#define mmiowb()
+
+#endif
+
+#endif /* mmiowb */
+
+#endif