kernel/git/stable/linux.git/tools/lib/bpf/Makefile, branch master

tools/build: Allow versioning LLVM readelf

2026-07-26T05:25:00+00:00

Documentation/kbuild/llvm.rst mentions that readelf is included in the LLVM toolchain, but it's not currently included in this block. Add it so that LLVM=... options also apply to readelf. Users in tools/ were Perf which was hardcoding it, and another was the BPF makefile. Both already include Makefile.include so convert them to use the new variables. Where readelf wasn't doing anything arch specific, use HOSTREADELF because it's more likely to be installed. Reviewed-by: Ian Rogers Signed-off-by: James Clark Acked-by: Ihor Solodrai Acked-by: Kumar Kartikeya Dwivedi Signed-off-by: Namhyung Kim

libbpf: Initialize CFLAGS before including Makefile.include

2026-06-15T00:32:53+00:00

tools/scripts/Makefile.include may expand EXTRA_CFLAGS in a future change. This could alter the initialization of CFLAGS, as the default options "-g -O2" would never be set once EXTRA_CFLAGS is expanded. Prepare for this by moving the CFLAGS initialization before including tools/scripts/Makefile.include, so it is not affected by the extended EXTRA_CFLAGS. Append EXTRA_CFLAGS to CFLAGS only after including Makefile.include and place it last so that the extra flags propagate properly and can override the default options. tools/scripts/Makefile.include already appends $(CLANG_CROSS_FLAGS) to CFLAGS, the Makefile appends $(CLANG_CROSS_FLAGS) again, remove the redundant append. Signed-off-by: Leo Yan Acked-by: Ihor Solodrai Link: https://lore.kernel.org/r/20260602-tools_build_fix_zero_init_bpf_only-v2-4-c76e5250ea1c@arm.com Signed-off-by: Alexei Starovoitov

tools: Remove redundant quiet setup

2025-02-18T19:27:43+00:00

Q is exported from Makefile.include so it is not necessary to manually set it. Reviewed-by: Jiri Olsa Signed-off-by: Charlie Jenkins Acked-by: Andrii Nakryiko Acked-by: Quentin Monnet Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Alexei Starovoitov Cc: Benjamin Tissoires Cc: Daniel Borkmann Cc: Daniel Lezcano Cc: Eduard Zingerman Cc: Hao Luo Cc: Ian Rogers Cc: Ingo Molnar Cc: Jiri Kosina Cc: John Fastabend Cc: Josh Poimboeuf Cc: KP Singh Cc: Lukasz Luba Cc: Mark Rutland Cc: Martin KaFai Lau Cc: Mykola Lysenko Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Rafael J. Wysocki Cc: Shuah Khan Cc: Song Liu Cc: Stanislav Fomichev Cc: Steven Rostedt (VMware) Cc: Yonghong Song Cc: Zhang Rui Link: https://lore.kernel.org/r/20250213-quiet_tools-v3-2-07de4482a581@rivosinc.com Signed-off-by: Arnaldo Carvalho de Melo

libbpf: Add missing per-arch include path

2024-10-08T03:20:55+00:00

libbpf does not include the per-arch tools include path, e.g. tools/arch/riscv/include. Some architectures depend those files to build properly. Include tools/arch/$(SUBARCH)/include in the libbpf build. Fixes: 6d74d178fe6e ("tools: Add riscv barrier implementation") Signed-off-by: Björn Töpel Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20240927131355.350918-1-bjorn@kernel.org

tools build: Correct bpf fixdep dependencies

2024-08-05T15:19:48+00:00

The dependencies in tools/lib/bpf/Makefile are incorrect. Before we recurse to build $(BPF_IN_STATIC), we need to build its 'fixdep' executable. I can't use the usual shortcut from Makefile.include: : fixdep because its 'fixdep' target relies on $(OUTPUT), and $(OUTPUT) differs in the parent 'make' versus the child 'make' -- so I imitate it via open-coding. I tweak a few $(MAKE) invocations while I'm at it, because 1. I'm adding a new recursive make; and 2. these recursive 'make's print spurious lines about files that are "up to date" (which isn't normally a feature in Kbuild subtargets) or "jobserver not available" (see [1]) I also need to tweak the assignment of the OUTPUT variable, so that relative path builds work. For example, for 'make tools/lib/bpf', OUTPUT is unset, and is usually treated as "cwd" -- but recursive make will change cwd and so OUTPUT has a new meaning. For consistency, I ensure OUTPUT is always an absolute path. And $(Q) gets a backup definition in tools/build/Makefile.include, because Makefile.include is sometimes included without tools/build/Makefile, so the "quiet command" stuff doesn't actually work consistently without it. After this change, top-level builds result in an empty grep result from: $ grep 'cannot find fixdep' $(find tools/ -name '*.cmd') [1] https://www.gnu.org/software/make/manual/html_node/MAKE-Variable.html If we're not using $(MAKE) directly, then we need to use more '+'. Signed-off-by: Brian Norris Acked-by: Andrii Nakryiko Acked-by: Jiri Olsa Cc: Ian Rogers Cc: Josh Poimboeuf Cc: Masahiro Yamada Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Thomas Richter Link: https://lore.kernel.org/r/20240715203325.3832977-4-briannorris@chromium.org Signed-off-by: Arnaldo Carvalho de Melo

kbuild: unexport abs_srctree and abs_objtree

2024-03-10T08:27:17+00:00

Commit 25b146c5b8ce ("kbuild: allow Kbuild to start from any directory") exported abs_srctree and abs_objtree to avoid recomputation after the sub-make. However, this approach turned out to be fragile. Commit 5fa94ceb793e ("kbuild: set correct abs_srctree and abs_objtree for package builds") moved them above "ifneq ($(sub_make_done),1)", eliminating the need for exporting them. These are only needed in the top Makefile. If an absolute path is required in sub-directories, you can use $(abspath ) or $(realpath ) as needed. Signed-off-by: Masahiro Yamada Reviewed-by: Nicolas Schier

libbpf: fix typos in Makefile

2023-08-02T20:58:51+00:00

Capitalize ABI (acronym) and fix spelling of "destination". Fixes: 706819495921 ("libbpf: Improve usability of libbpf Makefile") Signed-off-by: Randy Dunlap Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Andrii Nakryiko Cc: bpf@vger.kernel.org Cc: Xin Liu Link: https://lore.kernel.org/r/20230722065236.17010-1-rdunlap@infradead.org Signed-off-by: Alexei Starovoitov

Merge remote-tracking branch 'torvalds/master' into perf/core

2022-12-16T12:53:53+00:00

To resolve a trivial merge conflict with c302378bc157f6a7 ("libbpf: Hashmap interface update to allow both long and void* keys/values"), where a function present upstream was removed in the perf tools development tree. Signed-off-by: Arnaldo Carvalho de Melo

libbpf: Improve usability of libbpf Makefile

2022-12-03T00:30:34+00:00

Current libbpf Makefile does not contain the help command, which is inconvenient to use. Similar to the Makefile help command of the perf, a help command is provided to list the commands supported by libbpf make and the functions of the commands. Signed-off-by: Xin Liu Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20221202081738.128513-1-liuxin350@huawei.com

tools lib bpf: Avoid install_headers make warning

2022-11-20T14:32:23+00:00

The perf build makes the install_headers target, however, as there is no action for this target a warning is always produced of: make[3]: Nothing to be done for 'install_headers'. Solve this by adding a display of 'INSTALL libbpf_headers'. Signed-off-by: Ian Rogers Acked-by: Andrii Nakryiko Cc: Alexander Shishkin Cc: Alexei Starovoitov Cc: Daniel Borkmann Cc: Hao Luo Cc: Ingo Molnar Cc: Jiri Olsa Cc: John Fastabend Cc: KP Singh Cc: Mark Rutland Cc: Martin KaFai Lau Cc: Masahiro Yamada Cc: Namhyung Kim Cc: Nicolas Schier Cc: Peter Zijlstra Cc: Song Liu Cc: Stanislav Fomichev Cc: Stephane Eranian Cc: Yonghong Song Cc: bpf@vger.kernel.org Link: https://lore.kernel.org/r/20221117004356.279422-3-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo