X-Git-Url: https://git.kernel.dk/?a=blobdiff_plain;f=compiler%2Fcompiler.h;h=e1afcb424b8efa06380311cd1e865df3fb6f0d64;hb=8ad3b3dd6b1fc9a63f5932340b17d504c9e4ce56;hp=72e84197584e1aa8872e2905bc70710989443416;hpb=67bf982340d95ca98098ea050b54b4c7adb116c0;p=fio.git

diff --git a/compiler/compiler.h b/compiler/compiler.h
index 72e84197..e1afcb42 100644
--- a/compiler/compiler.h
+++ b/compiler/compiler.h
@@ -13,4 +13,24 @@
 #define __must_check
 #endif
 
+/*
+ * Mark unused variables passed to ops functions as unused, to silence gcc
+ */
+#define fio_unused	__attribute__((__unused__))
+#define fio_init	__attribute__((constructor))
+#define fio_exit	__attribute__((destructor))
+
+#define fio_unlikely(x)	__builtin_expect(!!(x), 0)
+
+/*
+ * Check at compile time that something is of a particular type.
+ * Always evaluates to 1 so you may use it easily in comparisons.
+ */
+#define typecheck(type,x) \
+({	type __dummy; \
+	typeof(x) __dummy2; \
+	(void)(&__dummy == &__dummy2); \
+	1; \
+})
+
 #endif