linux-kernel - 6.12.y: vmlinux.o: warning: objtool: .text+0x0: unreachable instruction

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Message-ID: <1123639a-7d72-46a1-a241-f48317f4123f@gmx.de>
Date: Thu, 2 Jan 2025 12:01:32 +0100
From: Toralf Förster <toralf.foerster@....de>
To: Linux Kernel <linux-kernel@...r.kernel.org>
Subject: 6.12.y: vmlinux.o: warning: objtool: .text+0x0: unreachable
 instruction

In 6.12.y I get this warning if compiling the kernel for a hardened
stable Gentoo Linux:

make -f ./scripts/Makefile.vmlinux_o
# LD      vmlinux.o
   ld -m elf_x86_64 -z noexecstack --no-warn-rwx-segments -r -o
vmlinux.o   --whole-archive vmlinux.a --no-whole-archive --start-group
lib/lib.a arch/x86/lib/lib.a --end-group  ; ./tools/objtool/objtool
--hacks=jump_label --hacks=noinstr --ibt --orc --retpoline --rethunk
--sls --static-call --uaccess --link vmlinux.o
vmlinux.o: warning: objtool: .text+0x0: unreachable instruction
vmlinux.o: warning: objtool: .text+0x4: unreachable instruction
vmlinux.o: warning: objtool: .text+0xb: unreachable instruction
vmlinux.o: warning: objtool: .text+0x10: unreachable instruction
vmlinux.o: warning: objtool: .text+0x17: unreachable instruction
vmlinux.o: warning: objtool: .text+0x1e: unreachable instruction


Shall I ignore it ?
--
Toralf