linux-kernel - [PATCH RFC 2/6] mm, slab: Remove compiler check in __kmalloc

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Date:   Mon, 29 Nov 2021 09:57:59 -0700
From:   Nathan Chancellor <nathan@...nel.org>
To:     Nick Desaulniers <ndesaulniers@...gle.com>,
        Kees Cook <keescook@...omium.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Arnd Bergmann <arnd@...db.de>
Cc:     Masahiro Yamada <masahiroy@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Tom Stellard <tstellar@...hat.com>,
        Michael Ellerman <mpe@...erman.id.au>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        Jakub Kicinski <kuba@...nel.org>, cki-project@...hat.com,
        kernelci@...ups.io, llvm@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        Nathan Chancellor <nathan@...nel.org>
Subject: [PATCH RFC 2/6] mm, slab: Remove compiler check in __kmalloc_index

The minimum supported version of LLVM has been raised to 11.0.0, meaning
this check is always true, so it can be dropped.

Signed-off-by: Nathan Chancellor <nathan@...nel.org>
---
 include/linux/slab.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/include/linux/slab.h b/include/linux/slab.h
index 181045148b06..d3fb5ac71c24 100644
--- a/include/linux/slab.h
+++ b/include/linux/slab.h
@@ -411,8 +411,7 @@ static __always_inline unsigned int __kmalloc_index(size_t size,
 	if (size <=  16 * 1024 * 1024) return 24;
 	if (size <=  32 * 1024 * 1024) return 25;
 
-	if ((IS_ENABLED(CONFIG_CC_IS_GCC) || CONFIG_CLANG_VERSION >= 110000)
-	    && !IS_ENABLED(CONFIG_PROFILE_ALL_BRANCHES) && size_is_constant)
+	if (!IS_ENABLED(CONFIG_PROFILE_ALL_BRANCHES) && size_is_constant)
 		BUILD_BUG_ON_MSG(1, "unexpected size in kmalloc_index()");
 	else
 		BUG();
-- 
2.34.1