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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20241113120327.5239-4-suravee.suthikulpanit@amd.com>
Date: Wed, 13 Nov 2024 12:03:20 +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>,
	<arnd@...db.de>, <ubizjak@...il.com>, <linux-arch@...r.kernel.org>,
	<jgg@...dia.com>, <kevin.tian@...el.com>, <jon.grimm@....com>,
	<santosh.shukla@....com>, <pandoh@...gle.com>, <kumaranand@...gle.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v10 03/10] compiler_types.h: Introduce 128-bit unqualified scalar type support

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

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@...db.de>
Cc: linux-arch@...r.kernel.org
Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 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