From: Song Liu <song@kernel.org>
To: live-patching@vger.kernel.org
Cc: jpoimboe@kernel.org, jikos@kernel.org, mbenes@suse.cz,
pmladek@suse.com, joe.lawrence@redhat.com, kernel-team@meta.com,
Song Liu <song@kernel.org>
Subject: [PATCH 0/8] objtool/klp: klp-build LTO support and tests
Date: Thu, 12 Feb 2026 11:21:53 -0800 [thread overview]
Message-ID: <20260212192201.3593879-1-song@kernel.org> (raw)
Add support for LTO in klp-build toolchain. The key changes are to the
symbol correlation logic.Basically, we want to:
1. Match symbols with differerent .llvm.<hash> suffixes, e.g., foo.llvm.123
to foo.llvm.456.
2. Match local symbols with promoted global symbols, e.g., local foo
with global foo.llvm.123.
1/8 and 2/8 are small cleanup/fix for existing code.
3/8 through 7/8 contains the core logic changes to correlate_symbols().
8/8 contains tests for klp-build toolchain.
Song Liu (8):
objtool/klp: Remove redundent strcmp in correlate_symbols
objtool/klp: Remove trailing '_' in demangle_name()
objtool/klp: Use sym->demangled_name for symbol_name hash
objtool/klp: Also demangle global objects
objtool/klp: Remove .llvm suffix in demangle_name()
objtool/klp: Match symbols based on demangled_name for global
variables
objtool/klp: Correlate locals to globals
livepatch: Add tests for klp-build toolchain
kernel/livepatch/Kconfig | 20 +++
kernel/livepatch/Makefile | 2 +
kernel/livepatch/tests/Makefile | 6 +
kernel/livepatch/tests/klp_test_module.c | 111 ++++++++++++++
kernel/livepatch/tests/klp_test_module.h | 8 +
kernel/livepatch/tests/klp_test_vmlinux.c | 138 ++++++++++++++++++
kernel/livepatch/tests/klp_test_vmlinux.h | 16 ++
kernel/livepatch/tests/klp_test_vmlinux_aux.c | 59 ++++++++
scripts/setlocalversion | 9 ++
tools/objtool/elf.c | 95 +++++++++---
tools/objtool/include/objtool/elf.h | 2 +
tools/objtool/klp-diff.c | 59 +++++++-
.../selftests/livepatch/test_patches/README | 15 ++
.../test_patches/klp_test_hash_change.patch | 30 ++++
.../test_patches/klp_test_module.patch | 18 +++
.../klp_test_nonstatic_to_static.patch | 40 +++++
.../klp_test_static_to_nonstatic.patch | 39 +++++
.../test_patches/klp_test_vmlinux.patch | 18 +++
18 files changed, 663 insertions(+), 22 deletions(-)
create mode 100644 kernel/livepatch/tests/Makefile
create mode 100644 kernel/livepatch/tests/klp_test_module.c
create mode 100644 kernel/livepatch/tests/klp_test_module.h
create mode 100644 kernel/livepatch/tests/klp_test_vmlinux.c
create mode 100644 kernel/livepatch/tests/klp_test_vmlinux.h
create mode 100644 kernel/livepatch/tests/klp_test_vmlinux_aux.c
create mode 100644 tools/testing/selftests/livepatch/test_patches/README
create mode 100644 tools/testing/selftests/livepatch/test_patches/klp_test_hash_change.patch
create mode 100644 tools/testing/selftests/livepatch/test_patches/klp_test_module.patch
create mode 100644 tools/testing/selftests/livepatch/test_patches/klp_test_nonstatic_to_static.patch
create mode 100644 tools/testing/selftests/livepatch/test_patches/klp_test_static_to_nonstatic.patch
create mode 100644 tools/testing/selftests/livepatch/test_patches/klp_test_vmlinux.patch
--
2.47.3
next reply other threads:[~2026-02-12 19:22 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-12 19:21 Song Liu [this message]
2026-02-12 19:21 ` [PATCH 1/8] objtool/klp: Remove redundent strcmp in correlate_symbols Song Liu
2026-02-12 19:21 ` [PATCH 2/8] objtool/klp: Remove trailing '_' in demangle_name() Song Liu
2026-02-12 19:21 ` [PATCH 3/8] objtool/klp: Use sym->demangled_name for symbol_name hash Song Liu
2026-02-12 19:21 ` [PATCH 4/8] objtool/klp: Also demangle global objects Song Liu
2026-02-12 19:21 ` [PATCH 5/8] objtool/klp: Remove .llvm suffix in demangle_name() Song Liu
2026-02-12 19:21 ` [PATCH 6/8] objtool/klp: Match symbols based on demangled_name for global variables Song Liu
2026-02-12 19:22 ` [PATCH 7/8] objtool/klp: Correlate locals to globals Song Liu
2026-02-12 19:22 ` [PATCH 8/8] livepatch: Add tests for klp-build toolchain Song Liu
2026-02-18 23:00 ` [PATCH 0/8] objtool/klp: klp-build LTO support and tests Joe Lawrence
2026-02-19 3:08 ` Song Liu
2026-02-19 20:47 ` Song Liu
2026-02-19 20:51 ` Josh Poimboeuf
2026-02-19 21:31 ` Song Liu
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