linux-kernel - [PATCH v1 0/3] Fix objtool warnings if LTO is enabled for LoongArch (Part 2)

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250901072156.31361-1-yangtiezhu@loongson.cn>
Date: Mon,  1 Sep 2025 15:21:53 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Huacai Chen <chenhuacai@...nel.org>,
	Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Nathan Chancellor <nathan@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v1 0/3] Fix objtool warnings if LTO is enabled for LoongArch (Part 2)

The previous patches [1] [2] are to fix most of the warnings (total 3030):

  sibling call from callable instruction with modified stack frame

This series is a follow up to fix 2 kinds of warnings (total 24), it only
touches the objtool and LoongArch related code:

  falls through to next function
  unreachable instruction

With this series, there is only 1 kind of warning (total 3), it does not
only touch the objtool and LoongArch related code:

  missing __noreturn in .c/.h or NORETURN() in noreturns.h

In order to silence the above warnings, it needs to change the related
code to give the functions __noreturn attribute, and have a NORETURN()
annotation in tools/objtool/noreturns.h. IMO, it will touch all of the
archs and the generic code, so this needs much more work to avoid the
side effect or regression, once it is done I will send out the patch.

Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a47bc954cf0e [1]
Link: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=5dfea6644d20 [2]

Tiezhu Yang (3):
  objtool/LoongArch: Fix fall through warning about efi_boot_kernel()
  objtool/LoongArch: Fix unreachable instruction warnings about EFISTUB
  LoongArch: Fix unreachable instruction warnings about entry functions

 arch/loongarch/kernel/Makefile | 2 --
 arch/loongarch/kernel/head.S   | 6 ++----
 tools/objtool/check.c          | 8 ++++++++
 3 files changed, 10 insertions(+), 6 deletions(-)

-- 
2.42.0