Add missing header for gcc3

When include/linux/compiler.h is included, the associated gcc3
header is required for older build environments.

Signed-off-by: Scott McNutt <smcnutt@psyent.com>
Acked-by: Mike Frysinger <vapier@gentoo.org>
[backport from u-boot mainline for gcc6]
Signed-off-by: Seung-Woo Kim <sw0312.kim@samsung.com>
Change-Id: I21ca3964ba7508c441582276120a9cf93425cf30

diff --git a/include/linux/compiler-gcc3.h b/include/linux/compiler-gcc3.h
new file mode 100644 (file)
index 0000000..2befe65
--- /dev/null
+++ b/include/linux/compiler-gcc3.h
@@ -0,0 +1,21 @@
+#ifndef __LINUX_COMPILER_H
+#error "Please don't include <linux/compiler-gcc3.h> directly, include <linux/compiler.h> instead."
+#endif
+
+#if __GNUC_MINOR__ >= 3
+# define __used                        __attribute__((__used__))
+#else
+# define __used                        __attribute__((__unused__))
+#endif
+
+#if __GNUC_MINOR__ >= 4
+#define __must_check           __attribute__((warn_unused_result))
+#endif
+
+/*
+ * A trick to suppress uninitialized variable warning without generating any
+ * code
+ */
+#define uninitialized_var(x) x = x
+
+#define __always_inline                inline __attribute__((always_inline))