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c2970d8b52
linux/scripts
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Lorenzo Stoakes (ARM) c2970d8b52
kbuild: do not sort nm output where the order is irrelevant 
Unless instructed otherwise, nm sorts by name.

There are places where this is unnecessary - an invocation from
scripts/sorttable every vmlinux link, scripts/check-function-names.sh run
after every vmlinux.o link, and the x86 VOFFSET and ZOFFSET listings
between vmlinux and bzImage.

Both GNU nm and llvm-nm accept the same '-p' parameter to disable sorting
in these instances, so use that to prevent this unnecessary work.

Each nm run on its own, x86-64, median of 5:

                             GNU nm 2.47              llvm-nm 22
                          before  after   delta    before  after   delta
  defconfig
  sorttable, nm -S vmlinux 0.080s 0.039s -0.041s   0.265s 0.113s -0.152s
  check-function-names.sh  0.072s 0.033s -0.039s   0.244s 0.102s -0.142s
  VOFFSET                  0.077s 0.034s -0.043s   0.261s 0.113s -0.148s
  ZOFFSET                  0.007s 0.005s -0.002s   0.005s 0.005s  0.000s
  TOTAL                                  -0.125s                 -0.442s

  allmodconfig
  sorttable, nm -S vmlinux 0.156s 0.063s -0.093s   0.539s 0.223s -0.316s
  check-function-names.sh  0.149s 0.054s -0.095s   0.537s 0.217s -0.320s
  VOFFSET                  0.146s 0.052s -0.094s   0.524s 0.221s -0.303s
  ZOFFSET                  0.007s 0.005s -0.002s   0.006s 0.004s -0.002s
  TOTAL                                  -0.284s                 -0.941s

llvm-nm appears to be a lot slower than GNU nm, so these builds naturally
improve the most.

The four run one after another in the serial tail of every build that links
vmlinux so impact kernel builds directly.

In an allmodconfig the decompressor is built in parallel while the modules,
so only the two before the vmlinux link contribute to build time.

The build outputs remain unchanged.

Whole build, 128-thread Threadripper 9980X, best of N runs:

                                          before    after     delta
                                        ---------------------------------
  x86 defconfig, touch mm/vma.c, gcc        9.7s     9.5s    -0.18s (-2%)
  x86 defconfig, touch mm/vma.c, clang      9.3s     9.0s    -0.27s (-3%)
  x86 defconfig, clean, gcc                30.3s    30.1s    -0.16s (-1%)
  x86 defconfig, clean, clang              31.7s    31.2s    -0.55s (-2%)
  x86 allmodconfig, touch mm/vma.c, clang  36.4s    35.8s    -0.67s (-2%)

Assisted-by: LLM
Reviewed-by: Nicolas Schier <n.schier@fritz.com>
Reviewed-by: Kees Cook <kees@kernel.org>
Signed-off-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
Link: https://patch.msgid.link/20260923-build-speedup-v4-5-73128809a4a4@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
2026-09-26 00:16:34 +01:00
..
atomic rust: helpers: Move #define __rust_helper out of atomic.c 2026-01-09 19:01:42 +08:00
bash-completion kbuild: add Kbuild bash completion 2025-03-15 21:22:52 +09:00
basic fixdep: make gendered language gender-neutral 2026-08-05 14:46:50 +02:00
clang-tools linux_kselftest-kunit-7.2-rc1 2026-06-16 16:33:57 +05:30
coccinelle coccinelle: ifnulldev_put: update error message 2026-08-30 14:36:11 +02:00
crypto lib/crypto: tests: Add KUnit test suite for AES-GCM 2026-08-10 20:17:56 -07:00
dtc dtc: dt-check-style: Simplify setting depth of DtsLine 2026-08-14 15:43:24 -05:00
dummy-tools kbuild: dummy-tools: Add python3 2026-01-29 17:12:13 -07:00
gcc-plugins gcc-plugins: Always define CONST_CAST_GIMPLE and CONST_CAST_TREE 2026-05-14 09:24:32 -07:00
gdb mm/page_owner: add MR_NEVER to enum migrate_reason and use it for last_migrate_reason 2026-07-28 21:11:50 -07:00
gendwarfksyms gendwarfksyms: Fix build on 32-bit hosts 2025-12-22 16:35:54 +00:00
genksyms genksyms: Fix parsing a declarator with a preceding attribute 2026-02-26 11:53:05 -07:00
include scripts: import more list macros 2024-10-07 02:12:27 +09:00
ipe scripts: ipe: polgen: remove redundant close and error exit path 2024-11-19 13:57:03 -08:00
kconfig kconfig: Add "def_string", "def_int" and "def_hex" 2026-09-24 11:37:05 -04:00
ksymoops
livepatch objtool/klp: Fix symbol resolution for duplicate data symbols 2026-08-03 07:12:39 +02:00
mod Objtool updates for v7.3: 2026-08-18 12:18:33 -07:00
package kbuild: rpm-pkg: Preserve BTF sections in kernel modules during debuginfo stripping 2026-07-29 16:21:42 -07:00
sbom scripts/sbom: catch ValueError from malformed shell quoting 2026-07-31 14:19:36 +02:00
selinux docs: Remove remainders of reiserfs 2025-08-18 10:45:43 -06:00
tracing scripts/tracing: Remove scripts/tracing/draw_functrace.py 2025-03-20 07:02:21 -04:00
.gitignore scripts: add tracepoint-update to the list of ignores files 2025-10-29 08:46:05 -04:00
as-version.sh
asn1_compiler.c
bloat-o-meter scripts/bloat-o-meter: ignore _sdata 2026-05-28 21:24:48 -07:00
bootgraph.pl
bpf_doc.py bpf: Finish constification of 1st parameter of bpf_d_path() 2025-10-04 09:05:23 -07:00
build-version
cc-can-link.sh kbuild: Fix CC_CAN_LINK detection 2026-02-13 14:23:06 -05:00
cc-version.sh
check_extable.sh
check-function-names.sh kbuild: do not sort nm output where the order is irrelevant 2026-09-26 00:16:34 +01:00
check-git
check-sysctl-docs docs: Replace spaces with tabs in check-sysctl-docs 2025-07-23 11:57:05 +02:00
check-uapi.sh check-uapi: use dummy libc includes 2026-03-20 21:43:56 +01:00
checkdeclares.pl
checker-valid.sh compiler: Use __typeof_unqual__() for __unqual_scalar_typeof() 2026-01-18 10:32:03 +01:00
checkincludes.pl
checkkconfigsymbols.py
checkpatch.pl mm.git review status for master..mm-nonmm-stable 2026-08-23 08:07:11 -07:00
checkstack.pl
checksyscalls.sh checksyscalls: only run when necessary 2026-04-05 09:21:31 +02:00
checkversion.pl
cleanfile
cleanpatch
coccicheck coccinelle: update Coccinelle website URL 2026-08-23 22:12:10 +02:00
config scripts/config: Use in-place editing (-i) in sed portably 2026-08-05 14:52:00 +02:00
const_structs.checkpatch const_structs.checkpatch: add bin_attribute 2025-06-17 10:44:07 +02:00
container scripts: add tool to run containerized builds 2026-01-22 15:30:48 -07:00
context-analysis-suppression.txt locking/rtmutex: Add context analysis 2026-03-08 11:06:53 +01:00
decode_stacktrace.sh decode_stacktrace: decode caller address 2026-03-27 21:19:45 -07:00
decodecode scripts/decodecode: return 0 on success 2026-03-27 21:19:48 -07:00
depmod.sh kbuild: add $(objtree)/ prefix to some in-kernel build artifacts 2024-11-27 09:38:27 +09:00
dev-needs.sh
diffconfig
elf-parse.c sorttable: Move ELF parsing into scripts/elf-parse.[ch] 2025-10-24 16:43:14 -04:00
elf-parse.h sorttable: Move ELF parsing into scripts/elf-parse.[ch] 2025-10-24 16:43:14 -04:00
extract_xc3028.pl
extract-fwblobs scripts: add script to extract built-in firmware blobs 2025-03-16 22:30:46 -07:00
extract-ikconfig
extract-module-sig.pl
extract-sys-certs.pl
extract-vmlinux extract-vmlinux: Output used decompression method 2025-08-28 15:25:48 -07:00
faddr2line scripts/faddr2line: Fix "Argument list too long" error 2025-10-14 14:45:20 -07:00
file-size.sh
gen_packed_field_checks.c lib: packing: add pack_fields() and unpack_fields() 2024-12-11 20:13:00 -08:00
gen-btf.sh scripts/gen-btf.sh: Use CONFIG_SHELL for execution 2026-01-21 12:36:32 -08:00
gen-crc-consts.py riscv/crc: add "template" for Zbc optimized CRC functions 2025-03-10 09:29:08 -07:00
gen-randstruct-seed.sh
generate_builtin_ranges.awk kbuild: exclude .rodata.(cst|str)* when building ranges 2025-03-15 21:22:52 +09:00
generate_initcall_order.pl
generate_rust_analyzer.py rust: zerocopy-derive: enable support in kbuild 2026-06-09 04:13:23 +02:00
generate_rust_target.rs s390 updates for 7.2 merge window 2026-06-16 05:08:13 +05:30
get_dvb_firmware
get_maintainer.pl get_maintainer: add --json output mode 2026-05-28 21:24:42 -07:00
gfp-translate scripts: fix gfp-translate after ___GFP_*_BITS conversion to an enum 2024-09-01 17:59:01 -07:00
git-resolve.sh git-resolve: add SPDX and copyright line 2025-04-25 15:54:24 +02:00
git.orderFile
head-object-list.txt openrisc: place exception table at the head of vmlinux 2024-12-10 12:04:19 +00:00
headerdep.pl
headers_install.sh scripts: headers_install.sh: Normalize __ASSEMBLY__ to __ASSEMBLER__ 2026-08-04 22:34:06 +02:00
insert-sys-cert.c
install.sh kbuild: Create INSTALL_PATH directory if it does not exist 2024-07-20 13:34:54 +09:00
integer-wrap-ignore.scl ubsan/overflow: Enable ignorelist parsing and add type filter 2025-03-07 19:58:05 -08:00
jobserver-exec scripts/jobserver-exec: propagate child exit status 2026-06-10 13:37:05 -05:00
kallsyms.c kallsyms: output binary data to speed output and kallsyms assembly 2026-09-26 00:16:34 +01:00
Kbuild.include kbuild: add $(objtree)/ prefix to some in-kernel build artifacts 2024-11-27 09:38:27 +09:00
Kconfig.include kconfig: Add "ld-option-str" 2026-09-24 11:37:05 -04:00
kernel-doc docs: add a scripts/kernel-doc symbolic link 2026-01-20 15:57:06 -07:00
ld-version.sh
leaking_addresses.pl
Lindent
link-vmlinux.sh kbuild: do not sort nm output where the order is irrelevant 2026-09-26 00:16:34 +01:00
macro_checker.py scripts: add macro_checker script to check unused parameters in macros 2024-09-01 20:43:28 -07:00
make_fit.py scripts/make_fit.py: Drop explicit LZMA parallel compression 2026-02-13 14:24:01 -05:00
Makefile sign-file: use 'struct module_signature' from the UAPI headers 2026-03-24 21:42:37 +00:00
Makefile.asm-headers kbuild: don't delete in-flight filechk temporaries in asm-headers 2026-09-12 20:01:13 +02:00
Makefile.autofdo kbuild: rust: rename flag to -Zdebuginfo-for-profiling for Rust >= 1.98 2026-06-04 09:26:57 +02:00
Makefile.btf resolve_btfids: Emit bpf_kfunc and bpf_fastcall decl tags 2026-08-06 22:01:28 -07:00
Makefile.build kbuild: rust: keep Rust objects out of Clang LTO with inline helpers 2026-08-23 21:27:17 +02:00
Makefile.clang kbuild: clang: Support building UM with SUBARCH=i386 2025-03-04 09:40:13 -08:00
Makefile.clean kbuild: change working directory to external module directory with M= 2024-11-28 08:10:23 +09:00
Makefile.compiler rust: kasan/kbuild: fix rustc-option when cross-compiling 2026-05-26 09:44:54 +02:00
Makefile.context-analysis compiler-context-analysis: Introduce header suppressions 2026-01-05 16:43:33 +01:00
Makefile.debug
Makefile.defconf kbuild: suppress stdout from merge_config for silent builds 2025-01-10 23:01:21 +09:00
Makefile.dtbinst
Makefile.dtbs scripts/dtc: Update to upstream version v1.7.2-62-ga26ef6400bd8 2026-02-03 20:58:12 -06:00
Makefile.gcc-plugins scripts/gcc-plugins: suppress recorded GCC switches for extmod builds 2026-09-01 16:12:15 -07:00
Makefile.headersinst
Makefile.host kbuild: support building external modules in a separate build directory 2024-11-28 08:11:55 +09:00
Makefile.kasan rust: kasan: add support for Software Tag-Based KASAN 2026-05-27 01:54:22 +02:00
Makefile.kcov - The 2 patch series "zram: support algorithm-specific parameters" from 2025-06-02 16:00:26 -07:00
Makefile.kcsan
Makefile.kmsan
Makefile.kstack_erase kstack_erase: Fix missed export of renamed KSTACK_ERASE_CFLAGS 2025-07-29 17:17:46 -07:00
Makefile.lib Objtool updates for v7.2: 2026-06-15 14:31:58 +05:30
Makefile.modfinal kbuild/btf: Remove broken module relinking exclusion 2026-04-29 18:03:49 -07:00
Makefile.modinst kbuild: Use objtree for module signing key path 2025-11-08 12:17:58 +01:00
Makefile.modpost modpost: Allow extended modversions without basic MODVERSIONS 2025-01-11 02:36:32 +09:00
Makefile.package kbuild: modules-cpio-pkg: Respect INSTALL_MOD_PATH 2026-03-30 07:38:26 +02:00
Makefile.propeller kbuild: Fix Propeller build option 2024-11-27 09:38:27 +09:00
Makefile.randstruct
Makefile.thinlto kbuild: distributed build support for Clang ThinLTO 2026-05-29 13:44:29 -07:00
Makefile.ubsan ARM: 2025-05-29 08:10:01 -07:00
Makefile.userprogs
Makefile.vdsoinst kbuild: vdso_install: drop build ID architecture allow-list 2026-04-02 17:50:40 +02:00
Makefile.vmlinux kbuild: do not allocate .modinfo in vmlinux 2026-09-26 00:16:33 +01:00
Makefile.vmlinux_a kbuild: Remove unnecessary 'T' modifier in cmd_ar_builtin_fixup 2026-06-02 18:41:50 -07:00
Makefile.vmlinux_o objtool/klp: Add .klp.symid for sympos disambiguation 2026-08-03 07:12:39 +02:00
Makefile.warn scripts/Makefile.warn: Drop -Wformat handling for clang < 16 2026-05-27 15:20:05 -07:00
makelst
markup_oops.pl
min-tool-version.sh rust/powerpc: Set min rustc version for powerpc 2026-07-31 16:57:48 +05:30
misc-check scripts/misc-check: update export checks for EXPORT_SYMBOL_FOR_MODULES() 2025-08-26 12:00:17 -07:00
mkcompile_h scripts/mkcompile_h: Update LINUX_COMPILE_HOST command substitution syntax 2026-08-31 16:57:04 -07:00
mksysmap scripts/mksysmap: fix escape of '$' in the __pi_ pattern 2026-09-12 20:01:19 +02:00
mkuboot.sh
module-common.c kbuild: compile constant module information only once 2024-09-07 17:24:08 +09:00
module.lds.S module: Remove unused DISCARD_EH_FRAME definition from module.lds.S 2026-08-06 13:29:02 +02:00
modules-check.sh
nsdeps coccinelle: update Coccinelle website URL 2026-08-23 22:12:10 +02:00
objdiff
objdump-func
orc_hash.sh
pahole-version.sh
parse-maintainers.pl
patch-kernel
profile2linkerlist.pl
prune-kernel
recordmcount.c
recordmcount.h
recordmcount.pl tracing: Remove redundant config HAVE_FTRACE_MCOUNT_RECORD 2025-07-22 20:15:56 -04:00
relocs_check.sh
remove-stale-files selinux: move genheaders to security/selinux/ 2024-10-03 16:07:51 -04:00
rust_is_available_bindgen_libclang_22.h rust: rust_is_available: warn for bindgen < 0.72.1 && libclang >= 22 2026-08-03 14:08:42 +02:00
rust_is_available_bindgen_libclang.h
rust_is_available_test.py rust: rust_is_available: warn for bindgen < 0.72.1 && libclang >= 22 2026-08-03 14:08:42 +02:00
rust_is_available.sh rust: rust_is_available: warn for bindgen < 0.72.1 && libclang >= 22 2026-08-03 14:08:42 +02:00
rustc-llvm-version.sh kbuild: rust: avoid errors with old rustcs without LLVM patch version 2024-10-28 00:27:16 +01:00
rustc-version.sh kbuild: rust: add CONFIG_RUSTC_VERSION 2024-09-05 22:44:18 +02:00
rustdoc_test_builder.rs rust: doctest: fix incorrect pattern in replacement 2026-06-19 09:39:50 +02:00
rustdoc_test_gen.rs rust: macros: auto-insert OwnerModule in #[vtable] 2026-08-12 09:36:26 +02:00
setlocalversion setlocalversion: make tag local to try_tag() 2026-08-31 16:57:21 -07:00
show_delta scripts: make python shebangs specific about desired version 2025-03-15 21:19:44 +09:00
sign-file.c sign-file: use 'struct module_signature' from the UAPI headers 2026-03-24 21:42:37 +00:00
sorttable.c sorttable: parse nm output correctly 2026-09-26 00:16:34 +01:00
spdxcheck-test.sh
spdxcheck.py treewide: Update email address 2026-01-11 06:09:11 -10:00
spdxexclude
spelling.txt treewide: fix transposed "sign" typos and update spelling.txt 2026-06-17 15:37:47 -07:00
ssl-common.h sign-file,extract-cert: avoid using deprecated ERR_get_error_line() 2024-09-20 19:49:52 +03:00
stackdelta
stackusage
subarch.include scripts: subarch.include: fix SUBARCH on macOS hosts 2024-09-10 13:56:37 +09:00
syscall.tbl arch: hookup fchroot() system call 2026-07-27 17:18:00 +02:00
syscallhdr.sh
syscallnr.sh
syscalltbl.sh
tags.sh scripts/tags.sh: Add support for rust source files 2026-08-05 14:31:55 +02:00
timer_migration_tree.py scripts/timers: Add timer_migration_tree.py 2026-05-06 08:33:07 +02:00
tools-support-relr.sh
tracepoint-update.c scripts/tracepoint-update: Fix memory leak in add_string() on failure 2026-01-23 13:34:45 -05:00
unifdef.c
update-intel-ucode-defs.py scripts/x86/intel: Add a script to update the old microcode list 2026-04-29 15:53:19 -07:00
ver_linux docs: changes.rst and ver_linux: sort the lists 2026-03-30 10:36:11 -06:00
verify_builtin_ranges.awk scripts: add verifier script for builtin module range data 2024-09-20 09:21:52 +09:00
xen-hypercalls.sh
xz_wrap.sh xz: adjust arch-specific options for better kernel compression 2024-09-01 20:43:27 -07:00