linux-kernel - [tip: objtool/core] s390/vmlinux.lds.S: Prevent thunk functions from getting placed with normal text

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Message-ID: <176060839926.709179.1306478390979270982.tip-bot2@tip-bot2>
Date: Thu, 16 Oct 2025 09:53:19 -0000
From: "tip-bot2 for Josh Poimboeuf" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Vasily Gorbik <gor@...ux.ibm.com>,
 Alexander Gordeev <agordeev@...ux.ibm.com>,
 Heiko Carstens <hca@...ux.ibm.com>, Petr Mladek <pmladek@...e.com>,
 Joe Lawrence <joe.lawrence@...hat.com>, Josh Poimboeuf <jpoimboe@...nel.org>,
 x86@...nel.org, linux-kernel@...r.kernel.org
Subject: [tip: objtool/core] s390/vmlinux.lds.S: Prevent thunk functions from
 getting placed with normal text

The following commit has been merged into the objtool/core branch of tip:

Commit-ID:     68e71067ec9ad08e1e51c06123a155d0814aff7c
Gitweb:        https://git.kernel.org/tip/68e71067ec9ad08e1e51c06123a155d0814aff7c
Author:        Josh Poimboeuf <jpoimboe@...nel.org>
AuthorDate:    Wed, 17 Sep 2025 09:03:09 -07:00
Committer:     Josh Poimboeuf <jpoimboe@...nel.org>
CommitterDate: Tue, 14 Oct 2025 14:45:21 -07:00

s390/vmlinux.lds.S: Prevent thunk functions from getting placed with normal text

The s390 indirect thunks are placed in the .text.__s390_indirect_jump_*
sections.

Certain config options which enable -ffunction-sections have a custom
version of the TEXT_TEXT macro:

  .text.[0-9a-zA-Z_]*

That unintentionally matches the thunk sections, causing them to get
grouped with normal text rather than being handled by their intended
rule later in the script:

  *(.text.*_indirect_*)

Fix that by adding another period to the thunk section names, following
the kernel's general convention for distinguishing code-generated text
sections from compiler-generated ones.

Cc: Vasily Gorbik <gor@...ux.ibm.com>
Cc: Alexander Gordeev <agordeev@...ux.ibm.com>
Acked-by: Heiko Carstens <hca@...ux.ibm.com>
Acked-by: Petr Mladek <pmladek@...e.com>
Tested-by: Joe Lawrence <joe.lawrence@...hat.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@...nel.org>
---
 arch/s390/include/asm/nospec-insn.h | 2 +-
 arch/s390/kernel/vmlinux.lds.S      | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/include/asm/nospec-insn.h b/arch/s390/include/asm/nospec-insn.h
index 6ce6b56..46f92bb 100644
--- a/arch/s390/include/asm/nospec-insn.h
+++ b/arch/s390/include/asm/nospec-insn.h
@@ -19,7 +19,7 @@
 #ifdef CONFIG_EXPOLINE_EXTERN
 	SYM_CODE_START(\name)
 #else
-	.pushsection .text.\name,"axG",@progbits,\name,comdat
+	.pushsection .text..\name,"axG",@progbits,\name,comdat
 	.globl \name
 	.hidden \name
 	.type \name,@function
diff --git a/arch/s390/kernel/vmlinux.lds.S b/arch/s390/kernel/vmlinux.lds.S
index d74d4c5..8609126 100644
--- a/arch/s390/kernel/vmlinux.lds.S
+++ b/arch/s390/kernel/vmlinux.lds.S
@@ -51,7 +51,7 @@ SECTIONS
 		IRQENTRY_TEXT
 		SOFTIRQENTRY_TEXT
 		FTRACE_HOTPATCH_TRAMPOLINES_TEXT
-		*(.text.*_indirect_*)
+		*(.text..*_indirect_*)
 		*(.gnu.warning)
 		. = ALIGN(PAGE_SIZE);
 		_etext = .;		/* End of text section */