linux-kernel - [PATCH] ARM: stacktrace: include asm/sections.h in asm/stacktrace.h

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Message-Id: <20250807071902.4077714-1-arnd@kernel.org>
Date: Thu,  7 Aug 2025 09:18:58 +0200
From: Arnd Bergmann <arnd@...nel.org>
To: Russell King <linux@...linux.org.uk>,
	Li Huafei <lihuafei1@...wei.com>,
	"Russell King (Oracle)" <rmk+kernel@...linux.org.uk>,
	Linus Waleij <linus.walleij@...aro.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Kees Cook <kees@...nel.org>,
	linux-arm-kernel@...ts.infradead.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ARM: stacktrace: include asm/sections.h in asm/stacktrace.h

From: Arnd Bergmann <arnd@...db.de>

The recent kstack erase changes appear to have uncovered an existing
issue with a missing header inclusion:

In file included from drivers/misc/lkdtm/kstack_erase.c:12:
In file included from include/linux/kstack_erase.h:16:
arch/arm/include/asm/stacktrace.h:48:21: error: call to undeclared function 'in_entry_text'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
   48 |                 frame->ex_frame = in_entry_text(frame->pc);
      |                                   ^

Include asm/sections.h here so the compiler can see the in_entry_text()
declaration.

Fixes: 752ec621ef5c ("ARM: 9234/1: stacktrace: Avoid duplicate saving of exception PC value")
Cc: Kees Cook <kees@...nel.org>
Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 arch/arm/include/asm/stacktrace.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/arm/include/asm/stacktrace.h b/arch/arm/include/asm/stacktrace.h
index f80a85b091d6..ba2f771cca23 100644
--- a/arch/arm/include/asm/stacktrace.h
+++ b/arch/arm/include/asm/stacktrace.h
@@ -2,8 +2,9 @@
 #ifndef __ASM_STACKTRACE_H
 #define __ASM_STACKTRACE_H
 
-#include <asm/ptrace.h>
 #include <linux/llist.h>
+#include <asm/ptrace.h>
+#include <asm/sections.h>
 
 struct stackframe {
 	/*
-- 
2.39.5