linux-kernel - [PATCH V3 06/49] compiler_types.h: Add __noinstr

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Date:   Thu, 14 Oct 2021 11:33:29 +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>,
        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 V3 06/49] 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>
Reviewed-by: Kees Cook <keescook@...omium.org>
Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 include/linux/compiler_types.h | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/include/linux/compiler_types.h b/include/linux/compiler_types.h
index b6ff83a714ca..3c77631c68bd 100644
--- a/include/linux/compiler_types.h
+++ b/include/linux/compiler_types.h
@@ -208,10 +208,12 @@ struct ftrace_likely_data {
 #endif
 
 /* Section for code which can't be instrumented at all */
-#define noinstr								\
-	noinline notrace __attribute((__section__(".noinstr.text")))	\
+#define __noinstr_section(section)				\
+	noinline notrace __attribute((__section__(section)))	\
 	__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
 
+#define noinstr __noinstr_section(".noinstr.text")
+
 #endif /* __KERNEL__ */
 
 #endif /* __ASSEMBLY__ */
-- 
2.19.1.6.gb485710b