From: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-kernel@vger.kernel.org,
Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Luc Van Oostenryck <luc.vanoostenryck@gmail.com>,
Eli Friedman <efriedma@codeaurora.org>,
Christopher Li <sparse@chrisli.org>,
Kees Cook <keescook@chromium.org>, Ingo Molnar <mingo@kernel.org>,
Geert Uytterhoeven <geert@linux-m68k.org>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Masahiro Yamada <yamada.masahiro@socionext.com>,
Joe Perches <joe@perches.com>,
Dominique Martinet <asmadeus@codewreck.org>,
linux-sparse@vger.kernel.org
Subject: [PATCH v4 04/13] Compiler Attributes: homogenize __must_be_array
Date: Sat, 8 Sep 2018 23:24:50 +0200 [thread overview]
Message-ID: <20180908212459.19736-5-miguel.ojeda.sandonis@gmail.com> (raw)
In-Reply-To: <20180908212459.19736-1-miguel.ojeda.sandonis@gmail.com>
Different definitions of __must_be_array:
* gcc: disabled for __CHECKER__
* clang: same definition as gcc's, but without __CHECKER__
* intel: the comment claims __builtin_types_compatible_p()
is unsupported; but icc seems to support it since 13.0.1
(released in 2012). See https://godbolt.org/z/S0l6QQ
Therefore, we can remove all of them and have a single definition
in compiler.h
Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk>
Cc: Luc Van Oostenryck <luc.vanoostenryck@gmail.com>
Cc: Eli Friedman <efriedma@codeaurora.org>
Cc: Christopher Li <sparse@chrisli.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Cc: Joe Perches <joe@perches.com>
Cc: Dominique Martinet <asmadeus@codewreck.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: linux-sparse@vger.kernel.org
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>
Signed-off-by: Miguel Ojeda <miguel.ojeda.sandonis@gmail.com>
---
include/linux/compiler-clang.h | 1 -
include/linux/compiler-gcc.h | 7 -------
include/linux/compiler-intel.h | 3 ---
include/linux/compiler.h | 7 +++++++
4 files changed, 7 insertions(+), 11 deletions(-)
diff --git a/include/linux/compiler-clang.h b/include/linux/compiler-clang.h
index d11cad61ba5c..fa9532f8d885 100644
--- a/include/linux/compiler-clang.h
+++ b/include/linux/compiler-clang.h
@@ -41,6 +41,5 @@
* compilers, like ICC.
*/
#define barrier() __asm__ __volatile__("" : : : "memory")
-#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
#define __assume_aligned(a, ...) \
__attribute__((__assume_aligned__(a, ## __VA_ARGS__)))
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index 371b6fa2d074..76f4907ef707 100644
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -68,13 +68,6 @@
*/
#define uninitialized_var(x) x = x
-#ifdef __CHECKER__
-#define __must_be_array(a) 0
-#else
-/* &a[0] degrades to a pointer: a different type from an array */
-#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
-#endif
-
#ifdef RETPOLINE
#define __noretpoline __attribute__((__indirect_branch__("keep")))
#endif
diff --git a/include/linux/compiler-intel.h b/include/linux/compiler-intel.h
index fef8bb3e53ef..6004b4588bd4 100644
--- a/include/linux/compiler-intel.h
+++ b/include/linux/compiler-intel.h
@@ -29,9 +29,6 @@
*/
#define OPTIMIZER_HIDE_VAR(var) barrier()
-/* Intel ECC compiler doesn't support __builtin_types_compatible_p() */
-#define __must_be_array(a) 0
-
#endif
/* icc has this, but it's called _bswap16 */
diff --git a/include/linux/compiler.h b/include/linux/compiler.h
index ec4a28bad2c6..165b1d5683ed 100644
--- a/include/linux/compiler.h
+++ b/include/linux/compiler.h
@@ -357,4 +357,11 @@ static inline void *offset_to_ptr(const int *off)
compiletime_assert(__native_word(t), \
"Need native word sized stores/loads for atomicity.")
+#ifdef __CHECKER__
+#define __must_be_array(a) 0
+#else
+/* &a[0] degrades to a pointer: a different type from an array */
+#define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
+#endif
+
#endif /* __LINUX_COMPILER_H */
--
2.17.1
next prev parent reply other threads:[~2018-09-08 21:26 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-08 21:24 [PATCH v4 00/13] Compiler Attributes Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 01/13] Compiler Attributes: remove unused attributes Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 02/13] Compiler Attributes: always use the extra-underscores syntax Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 03/13] Compiler Attributes: remove unneeded tests Miguel Ojeda
2018-09-08 21:24 ` Miguel Ojeda [this message]
2018-09-08 21:24 ` [PATCH v4 05/13] Compiler Attributes: naked was fixed in gcc 4.6 Miguel Ojeda
2018-09-10 17:45 ` Stefan Agner
2018-09-08 21:24 ` [PATCH v4 06/13] Compiler Attributes: naked can be shared Miguel Ojeda
2018-09-10 17:50 ` Stefan Agner
2018-09-08 21:24 ` [PATCH v4 07/13] Compiler Attributes: remove unneeded sparse (__CHECKER__) tests Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 08/13] Compiler Attributes: add missing SPDX ID in compiler_types.h Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 09/13] Compiler Attributes: use feature checks instead of version checks Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 10/13] Compiler Attributes: KENTRY used twice the "used" attribute Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 11/13] Compiler Attributes: remove uses of __attribute__ from compiler.h Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 12/13] Compiler Attributes: add Doc/process/programming-language.rst Miguel Ojeda
2018-09-09 18:19 ` Jonathan Corbet
2018-09-09 19:15 ` Miguel Ojeda
2018-09-08 21:24 ` [PATCH v4 13/13] Compiler Attributes: Add MAINTAINERS entry Miguel Ojeda
2018-09-09 8:02 ` [PATCH v4 00/13] Compiler Attributes Luc Van Oostenryck
2018-09-09 15:21 ` Miguel Ojeda
2018-09-09 16:52 ` Miguel Ojeda
2018-09-10 17:17 ` Nick Desaulniers
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