Messages in this thread | | | Date | Tue, 27 Jun 2023 13:20:57 +0200 | From | Ingo Molnar <> | Subject | [GIT PULL] objtool changes for v6.5 |
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Linus,
Please pull the latest objtool/core git tree from:
git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git objtool-core-2023-06-27
# HEAD: 301cf77e21317b3465c5e2bb0188df24bbf1c2e2 x86/orc: Make the is_callthunk() definition depend on CONFIG_BPF_JIT=y
objtool changes for v6.5:
- Build footprint & performance improvements:
- Reduce memory usage with CONFIG_DEBUG_INFO=y
In the worst case of an allyesconfig+CONFIG_DEBUG_INFO=y kernel, DWARF creates almost 200 million relocations, ballooning objtool's peak heap usage to 53GB. These patches reduce that to 25GB.
On a distro-type kernel with kernel IBT enabled, they reduce objtool's peak heap usage from 4.2GB to 2.8GB.
These changes also improve the runtime significantly.
- Debuggability improvements:
- Add the unwind_debug command-line option, for more extend unwinding debugging output. - Limit unreachable warnings to once per function - Add verbose option for disassembling affected functions - Include backtrace in verbose mode - Detect missing __noreturn annotations - Ignore exc_double_fault() __noreturn warnings - Remove superfluous global_noreturns entries - Move noreturn function list to separate file - Add __kunit_abort() to noreturns
- Unwinder improvements:
- Allow stack operations in UNWIND_HINT_UNDEFINED regions - drm/vmwgfx: Add unwind hints around RBP clobber
- Cleanups:
- Move the x86 entry thunk restore code into thunk functions - x86/unwind/orc: Use swap() instead of open coding it - Remove unnecessary/unused variables
- Fixes for modern stack canary handling
Thanks,
Ingo
------------------> Ingo Molnar (1): x86/orc: Make the is_callthunk() definition depend on CONFIG_BPF_JIT=y
Jiapeng Chong (1): x86/unwind/orc: Use swap() instead of open coding it
Josh Poimboeuf (36): x86/unwind/orc: Add 'unwind_debug' cmdline option objtool: Limit unreachable warnings to once per function objtool: Add verbose option for disassembling affected functions objtool: Include backtrace in verbose mode objtool: Detect missing __noreturn annotations objtool: Ignore exc_double_fault() __noreturn warnings objtool: Remove superfluous global_noreturns entries tools/lib/subcmd: Replace NORETURN usage with __noreturn objtool: Move noreturn function list to separate file objtool: Add __kunit_abort() to noreturns Revert "x86/orc: Make it callthunk aware" x86/entry: Move thunk restore code into thunk functions objtool: Allow stack operations in UNWIND_HINT_UNDEFINED regions drm/vmwgfx: Add unwind hints around RBP clobber objtool: Tidy elf.h objtool: Remove flags argument from elf_create_section() objtool: Improve reloc naming objtool: Consolidate rel/rela handling objtool: Fix reloc_hash size objtool: Add mark_sec_changed() objtool: Add elf_create_section_pair() objtool: Keep GElf_Rel[a] structs synced objtool: Don't free memory in elf_close() objtool: Add for_each_reloc() objtool: Allocate relocs in advance for new rela sections objtool: Get rid of reloc->list objtool: Get rid of reloc->idx objtool: Get rid of reloc->offset objtool: Get rid of reloc->type objtool: Get rid of reloc->addend objtool: Get rid of reloc->jump_table_start objtool: Shrink reloc->sym_reloc_entry objtool: Shrink elf hash nodes objtool: Get rid of reloc->rel[a] objtool: Free insns when done objtool: Skip reading DWARF section data
Lu Hongfei (1): tools: Remove unnecessary variables
Peter Zijlstra (1): lkdtm: Avoid objtool/ibt warning
ndesaulniers@google.com (2): start_kernel: Add __no_stack_protector function attribute start_kernel: Omit prevent_tail_call_optimization() for newer toolchains
Documentation/admin-guide/kernel-parameters.txt | 6 + arch/powerpc/kernel/smp.c | 1 + arch/x86/entry/thunk_64.S | 20 +- arch/x86/include/asm/alternative.h | 5 - arch/x86/include/asm/unwind_hints.h | 9 + arch/x86/kernel/callthunks.c | 4 +- arch/x86/kernel/unwind_orc.c | 75 ++- drivers/gpu/drm/vmwgfx/vmwgfx_msg_x86.h | 16 +- drivers/misc/lkdtm/bugs.c | 1 + include/linux/compiler_attributes.h | 12 + init/main.c | 9 +- tools/lib/subcmd/parse-options.h | 8 +- tools/lib/subcmd/subcmd-util.h | 5 +- tools/objtool/Documentation/objtool.txt | 10 + tools/objtool/arch/powerpc/include/arch/elf.h | 11 +- tools/objtool/arch/x86/decode.c | 6 +- tools/objtool/arch/x86/include/arch/elf.h | 11 +- tools/objtool/arch/x86/special.c | 6 +- tools/objtool/builtin-check.c | 5 + tools/objtool/check.c | 643 ++++++++++++++---------- tools/objtool/elf.c | 537 ++++++++------------ tools/objtool/include/objtool/builtin.h | 1 + tools/objtool/include/objtool/cfi.h | 1 + tools/objtool/include/objtool/elf.h | 327 ++++++++---- tools/objtool/include/objtool/warn.h | 21 +- tools/objtool/noreturns.h | 46 ++ tools/objtool/orc_gen.c | 8 +- tools/objtool/special.c | 4 +- 28 files changed, 1038 insertions(+), 770 deletions(-) create mode 100644 tools/objtool/noreturns.h
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