compiler-gcc: remove attribute support check for `__no_sanitize_undefined__`

The attribute was added in GCC 4.9, while the minimum GCC version
supported by the kernel is GCC 5.1.

Therefore, remove the check.

Link: https://godbolt.org/z/GrMeo6fYr
Link: https://lkml.kernel.org/r/20221021115956.9947-4-ojeda@kernel.org
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Dan Li <ashimida@linux.alibaba.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Cc: Marco Elver <elver@google.com>
Cc: Nick Desaulniers <ndesaulniers@google.com>
Cc: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>

diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
index ba207de..7f2c2bb 100644 (file)
--- a/include/linux/compiler-gcc.h
+++ b/include/linux/compiler-gcc.h
@@ -90,11 +90,7 @@
 #define __no_sanitize_thread
 #endif
 
-#if __has_attribute(__no_sanitize_undefined__)
 #define __no_sanitize_undefined __attribute__((__no_sanitize_undefined__))
-#else
-#define __no_sanitize_undefined
-#endif
 
 #if defined(CONFIG_KCOV) && __has_attribute(__no_sanitize_coverage__)
 #define __no_sanitize_coverage __attribute__((__no_sanitize_coverage__))