linux-kernel - [PATCH V4 06/50] compiler_types.h: Add __noinstr

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Date:   Tue, 26 Oct 2021 22:20:14 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     x86@...nel.org, Lai Jiangshan <laijs@...ux.alibaba.com>,
        Borislav Petkov <bp@...en8.de>,
        Miguel Ojeda <miguel.ojeda.sandonis@...il.com>,
        Kees Cook <keescook@...omium.org>,
        Nathan Chancellor <nathan@...nel.org>,
        Miguel Ojeda <ojeda@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Masahiro Yamada <masahiroy@...nel.org>,
        Marco Elver <elver@...gle.com>, Arnd Bergmann <arnd@...db.de>,
        Ard Biesheuvel <ardb@...nel.org>
Subject: [PATCH V4 06/50] compiler_types.h: Add __noinstr_section() for noinstr

From: Lai Jiangshan <laijs@...ux.alibaba.com>

And it will be extended for C entry code.

Cc: Borislav Petkov <bp@...en8.de>
Cc: Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Reviewed-by: Kees Cook <keescook@...omium.org>
Suggested-by: Nick Desaulniers <ndesaulniers@...gle.com>
Suggested-by: Peter Zijlstra <peterz@...radead.org>
Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 include/linux/compiler_types.h | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index b6ff83a714ca..df6f7252047e 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -208,9 +208,11 @@ struct ftrace_likely_data {
 #endif
 
 /* Section for code which can't be instrumented at all */
-#define noinstr								\
-	noinline notrace __attribute((__section__(".noinstr.text")))	\
-	__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
+#define __noinstr_section(section)				\
+	noinline notrace __section(section) __no_profile	\
+	__no_kcsan __no_sanitize_address __no_sanitize_coverage
+
+#define noinstr __noinstr_section(".noinstr.text")
 
 #endif /* __KERNEL__ */
 
-- 
2.19.1.6.gb485710b