The patch titled Subject: linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP* has been removed from the -mm tree. Its filename was linux-compiler-clangh-define-have_builtin_bswap.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------ From: Arnd Bergmann arnd@arndb.de Subject: linux/compiler-clang.h: define HAVE_BUILTIN_BSWAP*

Separating compiler-clang.h from compiler-gcc.h inadventently dropped the definitions of the three HAVE_BUILTIN_BSWAP macros, which requires falling back to the open-coded version and hoping that the compiler detects it.

Since all versions of clang support the __builtin_bswap interfaces, add back the flags and have the headers pick these up automatically.

This results in a 4% improvement of compilation speed for arm defconfig.

Link: https://lkml.kernel.org/r/20210225164513.3667778-1-arnd@kernel.org Fixes: 815f0ddb346c ("include/linux/compiler*.h: make compiler-*.h mutually exclusive") Signed-off-by: Arnd Bergmann arnd@arndb.de Cc: Masahiro Yamada masahiroy@kernel.org Cc: Nathan Chancellor nathan@kernel.org Cc: Nick Desaulniers ndesaulniers@google.com Cc: Miguel Ojeda ojeda@kernel.org Cc: Kees Cook keescook@chromium.org Cc: Marco Elver elver@google.com Cc: Sami Tolvanen samitolvanen@google.com Cc: Arvind Sankar nivedita@alum.mit.edu Cc: Randy Dunlap rdunlap@infradead.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---

include/linux/compiler-clang.h | 10 ++++++++++ 1 file changed, 10 insertions(+)

--- a/include/linux/compiler-clang.h~linux-compiler-clangh-define-have_builtin_bswap +++ a/include/linux/compiler-clang.h @@ -31,6 +31,16 @@ #define __no_sanitize_thread #endif

+/* + * sparse (__CHECKER__) pretends to be gcc, but can't do constant + * folding in __builtin_bswap*() (yet), so don't set these for it. + */ +#if defined(CONFIG_ARCH_USE_BUILTIN_BSWAP) && !defined(__CHECKER__) +#define __HAVE_BUILTIN_BSWAP32__ +#define __HAVE_BUILTIN_BSWAP64__ +#define __HAVE_BUILTIN_BSWAP16__ +#endif /* CONFIG_ARCH_USE_BUILTIN_BSWAP && !__CHECKER__ */ + #if __has_feature(undefined_behavior_sanitizer) /* GCC does not have __SANITIZE_UNDEFINED__ */ #define __no_sanitize_undefined \ _

Patches currently in -mm which might be from arnd@arndb.de are

memblock-fix-section-mismatch-warning.patch stop_machine-mark-helpers-__always_inline.patch