linux-kernel - [PATCH v4 0/7] Fix the failure issue of the module

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Message-Id: <20251217061435.802204-1-duanchenghao@kylinos.cn>
Date: Wed, 17 Dec 2025 14:14:28 +0800
From: Chenghao Duan <duanchenghao@...inos.cn>
To: yangtiezhu@...ngson.cn,
	rostedt@...dmis.org,
	mhiramat@...nel.org,
	mark.rutland@....com,
	hengqi.chen@...il.com,
	chenhuacai@...nel.org
Cc: kernel@...0n.name,
	zhangtianyang@...ngson.cn,
	masahiroy@...nel.org,
	linux-kernel@...r.kernel.org,
	loongarch@...ts.linux.dev,
	bpf@...r.kernel.org,
	duanchenghao@...inos.cn,
	youling.tang@...ux.dev,
	jianghaoran@...inos.cn,
	vincent.mc.li@...il.com,
	linux-trace-kernel@...r.kernel.org
Subject: [PATCH v4 0/7] Fix the failure issue of the module_attach test case

v4:
My sincere apologies for the misunderstanding in my interpretation of
Tiezhu's reply in the v2 email thread. After the release of v3, Tiezhu
reminded me again of the importance of splitting the patches, and I am
very grateful for this. Below are the changes made for v4.

Split the patch titled "LoongArch: BPF: Enhance trampoline support for
kernel and module tracing" into the following smaller patches by
functionality to facilitate code reading and review, while ensuring the
code logic and modification locations remain unchanged:
"LoongArch: BPF: Enable and fix trampoline-based tracing for module functions"
"LoongArch: BPF: Save return address register ra to t0 before trampoline"
"LoongArch: BPF: Adjust the jump offset of tail calls"
"LoongArch: BPF: Enhance the bpf_arch_text_poke() function"

--------------------------Changelog------------------------------------
v3:
links: https://lore.kernel.org/all/20251216094753.1317231-1-duanchenghao@kylinos.cn/
1. Adjust the position of fixup_exception() in the patch "LoongArch:
Enable exception fixup for specific ADE": move its invocation to within
the code block wrapped by irqentry_enter()/irqentry_exit().

2. Add the relevant test items to the patch commit log.

3. Adjust the sequence of patches

With the exception of the patch "LoongArch: Enable exception fixup for
specific ADE", no source code changes have been made in the other
patches.

v2:
links: https://lore.kernel.org/all/20251212091103.1247753-1-duanchenghao@kylinos.cn/
Referring to Tiezhu's suggestion, split the v1 patch titled
"LoongArch: Modify the jump logic of the trampoline" into three parts:
 (1) ftrace code
 (2) sample test
 (3) bpf code
The code logic and implementation remain unchanged.

v1:
links: https://lore.kernel.org/all/20251209093405.1309253-1-duanchenghao@kylinos.cn/
The following test cases under the tools/testing/selftests/bpf/
directory have passed the test：

./test_progs -t module_attach
./test_progs -t module_fentry_shadow
./test_progs -t subprogs
./test_progs -t subprogs_extable
./test_progs -t tailcalls
./test_progs -t struct_ops -d struct_ops_multi_pages
./test_progs -t fexit_bpf2bpf
./test_progs -t fexit_stress
./test_progs -t module_fentry_shadow
./test_progs -t fentry_test/fentry
./test_progs -t fexit_test/fexit
./test_progs -t fentry_fexit
./test_progs -t modify_return
./test_progs -t fexit_sleep
./test_progs -t test_overhead
./test_progs -t trampoline_count

Chenghao Duan (7):
  LoongArch: ftrace: Refactor register restoration in
    ftrace_common_return
  LoongArch: Enable exception fixup for specific ADE subcode
  LoongArch: BPF: Enable and fix trampoline-based tracing for module
    functions
  LoongArch: BPF: Save return address register ra to t0 before
    trampoline
  LoongArch: BPF: Adjust the jump offset of tail calls
  LoongArch: BPF: Enhance the bpf_arch_text_poke() function
  LoongArch: ftrace: Adjust register stack restore order in direct call
    trampolines

 arch/loongarch/kernel/mcount_dyn.S          | 14 +++++---
 arch/loongarch/kernel/traps.c               |  9 ++++-
 arch/loongarch/net/bpf_jit.c                | 38 +++++++++++++++------
 samples/ftrace/ftrace-direct-modify.c       |  8 ++---
 samples/ftrace/ftrace-direct-multi-modify.c |  8 ++---
 samples/ftrace/ftrace-direct-multi.c        |  4 +--
 samples/ftrace/ftrace-direct-too.c          |  4 +--
 samples/ftrace/ftrace-direct.c              |  4 +--
 8 files changed, 59 insertions(+), 30 deletions(-)

-- 
2.25.1