linux-kernel - [PATCH v2 0/3] Fix objtool warning about do

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Message-ID: <20240805032700.16038-1-yangtiezhu@loongson.cn>
Date: Mon,  5 Aug 2024 11:26:57 +0800
From: Tiezhu Yang <yangtiezhu@...ngson.cn>
To: Josh Poimboeuf <jpoimboe@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Huacai Chen <chenhuacai@...nel.org>
Cc: loongarch@...ts.linux.dev,
	linux-kernel@...r.kernel.org
Subject: [PATCH v2 0/3] Fix objtool warning about do_syscall() on LoongArch

With this series, there is no objtool warning about do_syscall() and
there is handle_syscall() which is the previous frame of do_syscall()
in the call trace when running "echo l > /proc/sysrq-trigger", tested
with the following two configs:

(1) CONFIG_RANDOMIZE_KSTACK_OFFSET=y &&
    CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=n
(2) CONFIG_RANDOMIZE_KSTACK_OFFSET=y &&
    CONFIG_RANDOMIZE_KSTACK_OFFSET_DEFAULT=y

Tiezhu Yang (3):
  objtool/LoongArch: Decode secondary stack instruction
  objtool: Handle secondary stack related instructions
  LoongArch: Remove STACK_FRAME_NON_STANDARD(do_syscall)

 arch/loongarch/kernel/syscall.c         |  4 ----
 tools/arch/loongarch/include/asm/inst.h | 12 ++++++++++
 tools/objtool/arch/loongarch/decode.c   | 29 ++++++++++++++++++++++++-
 tools/objtool/check.c                   | 22 +++++++++++++++++++
 tools/objtool/include/objtool/elf.h     |  1 +
 5 files changed, 63 insertions(+), 5 deletions(-)

-- 
2.42.0