[PATCH v10 03/10] compiler_types.h: Introduce 128-bit unqualified scalar type support

[Suravee Suthikulpanit]

From: Uros Bizjak <ubizjak@xxxxxxxxx>

Currently, __READ_ONCE() cannot support 128-bit data type due to the lack
of 128-bit support in __unqual_scalar_typeof() macro.

To ensure ordering for 128-bit data type when atomicity is not required,
introduce support for an unqualified scalar type __int128 if supported by
the architecture.

Cc: Arnd Bergmann <arnd@xxxxxxxx>
Cc: linux-arch@xxxxxxxxxxxxxxx
Reviewed-by: Jason Gunthorpe <jgg@xxxxxxxxxx>
Signed-off-by: Uros Bizjak <ubizjak@xxxxxxxxx>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@xxxxxxx>
---
 include/linux/compiler_types.h | 13 +++++++++++++
 1 file changed, 13 insertions(+)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index 1a957ea2f4fe..394e0e60bb27 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -469,6 +469,7 @@ struct ftrace_likely_data {
 		unsigned type:	(unsigned type)0,			\
 		signed type:	(signed type)0
 
+#if defined(CONFIG_ARCH_SUPPORTS_INT128) && defined(__SIZEOF_INT128__)
 #define __unqual_scalar_typeof(x) typeof(				\
 		_Generic((x),						\
 			 char:	(char)0,				\
@@ -477,7 +478,19 @@ struct ftrace_likely_data {
 			 __scalar_type_to_expr_cases(int),		\
 			 __scalar_type_to_expr_cases(long),		\
 			 __scalar_type_to_expr_cases(long long),	\
+			 __scalar_type_to_expr_cases(__int128),		\
 			 default: (x)))
+#else
+#define __unqual_scalar_typeof(x) typeof(				\
+		_Generic((x),						\
+			 char:	(char)0,				\
+			 __scalar_type_to_expr_cases(char),		\
+			 __scalar_type_to_expr_cases(short),		\
+			 __scalar_type_to_expr_cases(int),		\
+			 __scalar_type_to_expr_cases(long),		\
+			 __scalar_type_to_expr_cases(long long),	\
+			 default: (x)))
+#endif
 
 /* Is this type a native word size -- useful for atomic operations */
 #define __native_word(t) \
-- 
2.34.1