linux-kernel - [PATCH 05/24] x86/entry: Introduce __entry

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Message-Id: <20210831175025.27570-6-jiangshanlai@gmail.com>
Date:   Wed,  1 Sep 2021 01:50:06 +0800
From:   Lai Jiangshan <jiangshanlai@...il.com>
To:     linux-kernel@...r.kernel.org
Cc:     Lai Jiangshan <laijs@...ux.alibaba.com>,
        Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org, "H. Peter Anvin" <hpa@...or.com>
Subject: [PATCH 05/24] x86/entry: Introduce __entry_text for entry code written in C

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

Some entry code will be implemented in traps.c.  We need __entry_text
to set them in .entry.text section.

Signed-off-by: Lai Jiangshan <laijs@...ux.alibaba.com>
---
 arch/x86/entry/traps.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/entry/traps.c b/arch/x86/entry/traps.c
index f71db7934f90..ef07ae5fb3a0 100644
--- a/arch/x86/entry/traps.c
+++ b/arch/x86/entry/traps.c
@@ -69,6 +69,11 @@
 extern unsigned char native_irq_return_iret[];
 extern unsigned char asm_load_gs_index_gs_change[];
 
+/* Entry code written in C. Must be only used in traps.c */
+#define __entry_text							\
+	noinline notrace __attribute((__section__(".entry.text")))	\
+	__no_kcsan __no_sanitize_address __no_profile __no_sanitize_coverage
+
 #else
 #include <asm/processor-flags.h>
 #include <asm/setup.h>
-- 
2.19.1.6.gb485710b