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-rw-r--r--include/linux/compiler-gcc.h17
-rw-r--r--include/linux/compiler.h8
2 files changed, 25 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 8efb40e61d6e..02fa6176120d 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -210,6 +210,23 @@
#define __visible __attribute__((externally_visible))
#endif
+
+#if GCC_VERSION >= 40900
+/*
+ * __assume_aligned(n, k): Tell the optimizer that the returned
+ * pointer can be assumed to be k modulo n. The second argument is
+ * optional (default 0), so we use a variadic macro to make the
+ * shorthand.
+ *
+ * Beware: Do not apply this to functions which may return
+ * ERR_PTRs. Also, it is probably unwise to apply it to functions
+ * returning extra information in the low bits (but in that case the
+ * compiler should see some alignment anyway, when the return value is
+ * massaged by 'flags = ptr & 3; ptr &= ~3;').
+ */
+#define __assume_aligned(a, ...) __attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
+#endif
+
/*
* GCC 'asm goto' miscompiles certain code sequences:
*
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index 52a459ff75f4..4dac1036594f 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -417,6 +417,14 @@ static __always_inline void __write_once_size(volatile void *p, void *res, int s
#define __visible
#endif
+/*
+ * Assume alignment of return value.
+ */
+#ifndef __assume_aligned
+#define __assume_aligned(a, ...)
+#endif
+
+
/* Are two types/vars the same type (ignoring qualifiers)? */
#ifndef __same_type
# define __same_type(a, b) __builtin_types_compatible_p(typeof(a), typeof(b))