linux-kernel - [PATCH v8 03/10] asm/rwonce: Introduce [READ|WRITE]_ONCE() support for _

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Message-ID: <20241031184243.4184-4-suravee.suthikulpanit@amd.com>
Date: Thu, 31 Oct 2024 18:42:36 +0000
From: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To: <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>
CC: <joro@...tes.org>, <robin.murphy@....com>, <vasant.hegde@....com>,
	<jgg@...dia.com>, <kevin.tian@...el.com>, <jon.grimm@....com>,
	<santosh.shukla@....com>, <pandoh@...gle.com>, <kumaranand@...gle.com>, "Uros
 Bizjak" <ubizjak@...il.com>, Suravee Suthikulpanit
	<suravee.suthikulpanit@....com>
Subject: [PATCH v8 03/10] asm/rwonce: Introduce [READ|WRITE]_ONCE() support for __int128

From: Uros Bizjak <ubizjak@...il.com>

Currently, [READ|WRITE]_ONCE() do not support variable of type __int128.
Re-define "__dword_type" from type "long long" to __int128 if supported.

Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 include/asm-generic/rwonce.h   | 2 +-
 include/linux/compiler_types.h | 8 +++++++-
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/include/asm-generic/rwonce.h b/include/asm-generic/rwonce.h
index 8d0a6280e982..8bf942ad5ef3 100644
--- a/include/asm-generic/rwonce.h
+++ b/include/asm-generic/rwonce.h
@@ -33,7 +33,7 @@
  * (e.g. a virtual address) and a strong prevailing wind.
  */
 #define compiletime_assert_rwonce_type(t)					\
-	compiletime_assert(__native_word(t) || sizeof(t) == sizeof(long long),	\
+	compiletime_assert(__native_word(t) || sizeof(t) == sizeof(__dword_type), \
 		"Unsupported access size for {READ,WRITE}_ONCE().")
 
 /*
diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index 1a957ea2f4fe..54b56ae25db7 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -469,6 +469,12 @@ struct ftrace_likely_data {
 		unsigned type:	(unsigned type)0,			\
 		signed type:	(signed type)0
 
+#ifdef __SIZEOF_INT128__
+#define __dword_type __int128
+#else
+#define __dword_type long long
+#endif
+
 #define __unqual_scalar_typeof(x) typeof(				\
 		_Generic((x),						\
 			 char:	(char)0,				\
@@ -476,7 +482,7 @@ struct ftrace_likely_data {
 			 __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),	\
+			 __scalar_type_to_expr_cases(__dword_type),	\
 			 default: (x)))
 
 /* Is this type a native word size -- useful for atomic operations */
-- 
2.34.1