[PATCH v3 0/8] objtool/klp: klp-build LTO support and tests

[Song Liu <song@kernel.org>]

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.

Changes v2 => v3:
1. Fix a bug in global => local correlations (patch 7/8).
2. Remove a WARN().
3. Some empty line changes.

Changes v1 => v2:
1. Error out on ambiguous .llvm.<hash>

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 ++++++++
 tools/objtool/elf.c                           |  95 +++++++++---
 tools/objtool/include/objtool/elf.h           |   3 +
 tools/objtool/klp-diff.c                      |  93 +++++++++++-
 .../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 +++
 17 files changed, 689 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