kernel/git/next/linux-next.git/tools/build/feature, branch master

tools build: Fix timerfd feature detection with clang

2026-09-12T20:22:18+00:00

Clang's uninitialized-const-pointer warning causes a feature test to fail when building perf with clang. This disables support for 'perf kvm stat live'. Add default initialization to new_value as a workaround. test-timerfd.c:15:30: error: variable 'new_value' is uninitialized when passed as a const pointer argument here [-Werror,-Wuninitialized-const-pointer] 15 | if (timerfd_settime(fd, 0, &new_value, NULL) != 0) | ^~~~~~~~~ 1 error generated. Signed-off-by: Ian Rogers Link: https://lore.kernel.org/r/20260910213907.3206529-1-irogers@google.com Signed-off-by: Arnaldo Carvalho de Melo

tools build: Add zstd to the binutils library feature tests

2026-09-09T20:00:36+00:00

Recently zstd became needed with the binutils libraries, add it to the mix. Signed-off-by: Arnaldo Carvalho de Melo

tools: Port perf ui from GTK 2 to GTK 4

2026-09-09T20:00:04+00:00

Port straight to GTK 4 rather than GTK 3, since GTK 4 is where new development happens and GTK 3 is old itself now. GTK 4 drops GtkContainer, GdkScreen, and the gtk_main()/ gtk_dialog_run() family perf's GTK UI relied on. Containers get per-widget setters (gtk_box_append() and friends), monitor geometry comes from GdkMonitor instead of GdkScreen, and the main and error-dialog loops become explicit GMainLoops quit from the "close-request" and "response" signals. Widgets are visible by default now, so gtk_widget_show_all()/set_no_show_all() go away, and the remaining gtk_widget_show()/gtk_widget_hide() calls become gtk_widget_set_visible() (with a small wrapper where "response" needs to pass gtk_widget_hide() as a callback, since it no longer exists as a plain function). gtk_ui_progress__finish() skips destroying a progress dialog that was never created, since gtk_window_destroy() asserts on NULL where the old widget destroy tolerated it. Two spots the GTK 2 to GTK 3 port had missed (builtin-annotate.c, ui/gtk/setup.c still using HAVE_GTK2_SUPPORT and gtk_main_quit()) are fixed to match. Runtime fallout from the new signal-driven loops: the error dialog's nested loop hung if the parent window closed (GTK_DIALOG_DESTROY_WITH_PARENT destroys without emitting "response"); gtk_info_bar_get_content_area() is gone, breaking GTK_INFO_BAR_SUPPORT; the progress dialog's static widget pointers dangled after a manual close; perf_gtk__error() and the warning functions reused an exhausted va_list when vasprintf() failed. The error loop is tracked in a list instead of a single pointer, since perf_gtk__error() can be called re-entrantly (the dialog isn't modal) and a lone global leaked the outer loop when that happened. The list is only ever touched from the main thread: perf_gtk__error() updates it while handling a dialog, and SIGINT/SIGQUIT/SIGTERM are deferred to a GLib source via g_unix_signal_add() rather than calling perf_gtk__exit() straight out of a real signal handler, so quitting on those signals is serialized with the list update instead of racing it from signal-handler context. SIGSEGV/SIGFPE keep a real handler, since they're synchronous faults with no "later" to defer to, but it's pared down to reporting and reraising the default disposition (perf_gtk__fatal_signal()): there's no safe way to run GTK/GLib code from the faulting context. stdarg.h, stdio.h, and string.h are now included explicitly where used (util.c, hists.c, annotate.c) rather than relying on transitive includes, which musl doesn't guarantee. The gtk4-infobar feature check is dropped: GtkInfoBar has existed unconditionally since GTK 3.10, so the check can only ever pass, and it was failing outright here anyway since gtk_info_bar_new() is deprecated and the check treats deprecation warnings as errors. HAVE_GTK_INFO_BAR_SUPPORT and its statusbar-only fallback go away; the info bar is now built unconditionally. Signed-off-by: Matt Turner Link: https://lore.kernel.org/r/20260908-perf-gtk2-v8-1-e90d5d155f0d@gmail.com [ Fixed up some patch fuzz ] [ Removed gtk2 from FEATURES_DISPLAY, it is opt-in use 'make VF=1' to see if it was detected ] Signed-off-by: Arnaldo Carvalho de Melo

perf build: Remove leftover feature tests for removed cxx and clang support

2026-08-12T13:17:49+00:00

56b11a2126bf2f42 ("perf bpf: Remove support for embedding clang for compiling BPF events (-e foo.c)") removed the test-cxx.cpp and test-clang.cpp sources, but left behind their entries in the feature test FILES list, the build rules and the cxx and clang entries in FEATURE_TESTS_EXTRA. Since the sources no longer exist, those rules would always fail, making the artificial feature-cxx and feature-clang results to be perpetually disabled/absent, remove the leftover entries, making the feature test scripts list match the available sources. Fixes: 56b11a2126bf2f42 ("perf bpf: Remove support for embedding clang for compiling BPF events (-e foo.c)") Cc: Ian Rogers Assisted-by: opencode:deepseek-v4-flash-free Signed-off-by: Arnaldo Carvalho de Melo Signed-off-by: Namhyung Kim

Merge tag 'perf-tools-for-v7.2-1-2026-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools

2026-06-23T18:34:49+00:00

Pull perf tools updates from Arnaldo Carvalho de Melo: - Introduce 'perf inject --aslr' to remap ASLR-randomized addresses in perf.data files, enabling reproducible analysis across runs with different address space layouts - Refactor evsel out of sample processing paths: store evsel in struct perf_sample and remove the redundant evsel parameter from tool APIs, tracepoint handlers, hist entry iterators, and db-export, simplifying the entire tool callback chain - Switch architecture detection from string-based perf_env__arch() comparisons to the numeric ELF e_machine field across the codebase (capstone, print_insn, c2c, lock-contention, sort, sample-raw, machine, header), making cross-analysis more robust - Overhaul ARM CoreSight ETM tests: add deterministic and named_threads workloads, speed up basic and disassembly tests, add process attribution and concurrent threads tests, remove unused workloads and duplicate tests, queue context packets for the frontend decoder - Add ARM SPE IMPDEF event decoding for Arm Neoverse N1, store MIDR in arm_spe_pkt for per-CPU event mapping, handle missing CPU IDs gracefully - Refactor libunwind support: remove the libunwind-local backend, make register reading cross-platform, add RISC-V libunwind support, allow dynamic selection between libdw and libunwind unwinding at runtime - Extensive hardening of perf.data parsing against crafted files: add bounds checks and byte-swap validation for session records, feature sections, header attributes, BPF metadata, auxtrace errors, compressed events, CPU maps, build ID notes, and ELF program headers. Add minimum event size validation and file offset diagnostics - Fix libdw API contract violations across dwarf-aux, libdw, probe-finder, annotate-data, and debuginfo subsystems. Fix callchain parent update in ORDER_CALLER mode, support DWARF line 0 in inline lists, handle multiple address spaces in callchains - Fix numerous 'perf sched' bugs: thread reference leaks, memory leaks, heap overflows with cross-machine recordings, NULL dereferences, replace BUG_ON assertions with graceful error handling, bounds-check CPU indices, fix SIGCHLD vs pause() races in sched stats - Overhaul the build system: move BPF skeleton generation out of Makefile.perf into bpf_skel.mak, decouple pmu-events from the prepare target, make beauty generated C code standalone .o files, compile BPF skeletons with -mcpu=v3, fix continuous rebuilds, various cleanups - Add 'perf test' JUnit XML reporting with -j/--junit option, split monolithic test suites into sub-tests, add summary reporting, refactor parallel poll loop, fix test failures on musl-based systems - Fix 'perf c2c' memory leaks in hist entry and format list handling, use-after-free in error paths, bounds-check CPU and node IDs - Fix 'perf bpf' metadata leaks on duplicate insert and alloc failure, bounds-check array offsets, validate event sizes and func_info fields, add NULL checks - Fix hwmon PMU: off-by-one null termination on sysfs reads, strlcpy buffer overflow in parse_hwmon_filename(), fd 0 check, empty label reads, scnprintf usage - Fix symbols subsystem: bounds-check ELF and sysfs build ID note iteration, validate p_filesz, fix 32-bit ELF bswap error, fix signed overflow in size checks, bounds-check .gnu_debuglink section - Fix tools lib api: null termination in filename__read_int/ull(), uninitialized stack data in filename__write_int(), snprintf truncation in mount_overload() - Replace libbabeltrace with babeltrace2-ctf-writer for CTF conversion in 'perf data' - Add RISC-V SDT argument parsing for static tracepoints - Add 'perf trace --show-cpu' option to display CPU id - Add 'perf bench sched pipe --write-size' option - Add a perf-specific .clang-format that overrides some kernel style behaviors - Update Intel vendor events for Alder Lake, Arrow Lake, Clearwater Forest, Emerald Rapids, Granite Rapids, Grand Ridge, Lunar Lake, Meteor Lake, Panther Lake, Sapphire Rapids, Sierra Forest - Add IOMMU metrics for AMD and Intel - Fix AMD event: switch l2_itlb_misses to bp_l1_tlb_miss_l2_tlb_miss.all - Add AMD IBS improvements: decode Streaming-store and Remote-Socket flags, suppress bogus fields on Zen4+, skip privilege test on Zen6+ - Fix 'perf lock contention' SIGCHLD vs pause() race, allow 'mmap_lock' in -L filter, enable end-timestamp for cgroup aggregation, fix non-atomic data updates - Fix 'perf stat' false NMI watchdog warning in aggregation modes, bounds-check CPU index in topology callbacks, add aggr_nr metric parser support for uncore scaling - Fix 'perf timechart' memory leaks, CPU bounds checking, use-after-free on corrupted callchains - Fix 'perf inject' itrace branch stack synthesis, fix synthesized sample size with branch stacks - Fix DSO heap overflow on decompressed paths, uninitialized pathname on fallback, set proper error codes - Fix various snprintf/scnprintf usages to prevent buffer overflows and truncation across the codebase - Fix off-by-one stack buffer overflow in kallsyms__parse() - Fix 'perf kwork' memory management, address sanitizer issues, bounds check work->cpu - Fix 'perf tpebs' concurrent stop races and PID reuse hazards - Add O_CLOEXEC to open() calls and use mkostemp() for temporary files to prevent file descriptor leaks to child processes - Fix s390 Python extension TEXTREL by compiling as PIC - Fix build with ASAN for jitdump - Fix build failure due to btf_vlen() return type change * tag 'perf-tools-for-v7.2-1-2026-06-22' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (343 commits) perf bpf: Fix up build failure due to change of btf_vlen() return type perf dso: Set standard errno on decompression failure perf bpf: Validate array presence before casting BPF prog info pointers perf c2c: Fix hist entry and format list leaks in c2c_he_free() perf c2c: Free format list entries when c2c_hists__init() fails perf cs-etm: Bounds-check CPU in cs_etm__get_queue() perf cs-etm: Require full global header in auxtrace_info size check perf cs-etm: Validate num_cpu before metadata allocation perf machine: Use snprintf() for guestmount path construction perf machine: Propagate machine__init() error to callers perf trace: Guard __probe_ip suppression with evsel__is_probe() perf evsel: Add lazy-initialized probe type detection helpers perf evsel: Add no-libtraceevent stubs for evsel__field() and evsel__common_field() perf cs-etm: Reject CPU IDs that would overflow signed comparison perf c2c: Free format list entries when releasing c2c hist entries perf bpf: Bounds-check array offsets in bpil_offs_to_addr() perf bpf: Reject oversized BPF metadata events that truncate header.size perf bpf: Validate func_info_rec_size and sub_id in synthesize_bpf_prog_name() perf sched: Replace (void*)1 sentinel with proper runtime allocation perf hwmon: Fix fd check to accept fd 0 in hwmon_pmu__describe_items() ...

perf data ctf: replace libbabeltrace with babeltrace2-ctf-writer

2026-06-04T20:34:52+00:00

The 1.x branch of Babeltrace has been superseded by 2.x in 2020 and has been unmaintained since 2022, efforts have started to remove it from popular distributions. Babeltrace 2.x offers a very similar 'ctf-writer' library that can be used with minimal changes for the '--to-ctf' feature and has been packaged since Debian 11 and Fedora 32. This patch replaces the 'libbabeltrace' build feature with 'babeltrace2-ctf-writer' using pkgconfig detection, adjusts the naming of the public headers and applies minor API cleanups. There is no changes to the output ctf traces, the ctf-writer API still implements version 1.8 of the CTF specification that can be read by either Babeltrace 1 / 2 or any CTF compliant reader. Also remove some ifdefs in the cli option parsing to allow printing the helpful error message with '--to-ctf' when built without babeltrace2. Reviewed-by: Ian Rogers Signed-off-by: Michael Jeanson Cc: Adrian Hunter Cc: Alexander Shishkin Cc: Derek Foreman Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Mark Rutland Cc: Mathieu Desnoyers Cc: Namhyung Kim Cc: Peter Zijlstra Signed-off-by: Arnaldo Carvalho de Melo

tools build: Fix feature checks to touch target files on success

2026-06-04T13:58:47+00:00

In tools/build/feature/Makefile, test-clang-bpf-co-re.bin and test-bpftool-skeletons.bin redirected grep output but never touched or created the $@ target file upon success. Because the target file was never created on disk, Kbuild could never cache the result of the check. Consequently, Make treated the prerequisite as missing and continuously re-executed the Clang BPF backend and bpftool feature checks on every single sub-make evaluation during build startup, or on every incremental build. Refactor both feature check recipes to touch $@ on success. For test-clang-bpf-co-re.bin, group the shell pipeline within curly braces and redirect both stdout and stderr to .make.output to allow errors to be inspected and not appear in build output. List test-clang-bpf-co-re.bin's input C file as a dependency so modification triggers a rebuild. For test-bpftool-skeletons.bin, add it to the FILES list so that it will be cleaned. Assisted-by: Gemini:gemini-3.1-pro-preview Signed-off-by: Ian Rogers Tested-by: James Clark Cc: Bill Wendling Cc: Costa Shulyupin Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Justin Stitt Cc: Leo Yan Cc: Namhyung Kim Cc: Nathan Chancellor Cc: Nick Desaulniers Cc: Yuzhuo Jing Signed-off-by: Arnaldo Carvalho de Melo

libbpf: Add __NR_bpf definition for LoongArch

2026-05-28T21:38:15+00:00

LoongArch uses the generic syscall table, where __NR_bpf is defined as 280 in include/uapi/asm-generic/unistd.h. To align with other architectures, add the __NR_bpf definition for LoongArch to avoid a potential compilation failure: "error __NR_bpf not defined. libbpf does not support your arch." This is a follow up patch of: commit b0c47807d31d ("bpf: Add sparc support to tools and samples.") commit bad1926dd2f6 ("bpf, s390: fix build for libbpf and selftest suite") commit ca31ca8247e2 ("tools/bpf: fix perf build error with uClibc (seen on ARC)") commit e32cb12ff52a ("bpf, mips: Fix build errors about __NR_bpf undeclared") Signed-off-by: Tiezhu Yang Signed-off-by: Andrii Nakryiko Link: https://lore.kernel.org/bpf/20260526063936.16769-1-yangtiezhu@loongson.cn

tools build: Deduplicate test-libunwind for different architectures

2026-05-15T11:26:11+00:00

The separate test files only exist to pass a different #include, instead have a single source file and pass -include to $(CC) to include the relevant header file for the architecture being tested. Generate the rules using a foreach loop. Include tests for all current libunwind architectures. Signed-off-by: Ian Rogers Cc: Adrian Hunter Cc: Albert Ou Cc: Alexander Shishkin Cc: Alexandre Ghiti Cc: Andrew Jones Cc: Athira Rajeev Cc: Dapeng Mi Cc: Dmitrii Dolgov <9erthalion6@gmail.com> Cc: Florian Fainelli Cc: Howard Chu Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: John Garry Cc: Leo Yan Cc: Li Guan Cc: Namhyung Kim Cc: Palmer Dabbelt Cc: Paul Walmsley Cc: Peter Zijlstra Cc: Shimin Guo Cc: Thomas Richter Cc: Tomas Glozar Cc: Will Deacon Signed-off-by: Arnaldo Carvalho de Melo

Merge tag 'perf-tools-for-v7.1-2026-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools

2026-04-18T16:24:56+00:00

Pull perf tools updates from Namhyung Kim: "perf report: - Add 'comm_nodigit' sort key to combine similar threads that only have different numbers in the comm. In the following example, the 'comm_nodigit' will have samples from all threads starting with "bpfrb/" into an entry "bpfrb/". $ perf report -s comm_nodigit,comm -H ... # # Overhead CommandNoDigit / Command # ........... ........................ # 20.30% swapper 20.30% swapper 13.37% chrome 13.37% chrome 10.07% bpfrb/ 7.47% bpfrb/0 0.70% bpfrb/1 0.47% bpfrb/3 0.46% bpfrb/2 0.25% bpfrb/4 0.23% bpfrb/5 0.20% bpfrb/6 0.14% bpfrb/10 0.07% bpfrb/7 - Support flat layout for symfs. The --symfs option is to specify the location of debugging symbol files. The default 'hierarchy' layout would search the symbol file using the same path of the original file under the symfs root. The new 'flat' layout would search only in the root directory. - Update 'simd' sort key for ARM SIMD flags to cover ASE/SME and more predicate flags. perf stat: - Add --pmu-filter option to select specific PMUs. This would be useful when you measure metrics from multiple instance of uncore PMUs with similar names. # perf stat -M cpa_p0_avg_bw Performance counter stats for 'system wide': 19,417,779,115 hisi_sicl0_cpa0/cpa_cycles/ # 0.00 cpa_p0_avg_bw 0 hisi_sicl0_cpa0/cpa_p0_wr_dat/ 0 hisi_sicl0_cpa0/cpa_p0_rd_dat_64b/ 0 hisi_sicl0_cpa0/cpa_p0_rd_dat_32b/ 19,417,751,103 hisi_sicl10_cpa0/cpa_cycles/ # 0.00 cpa_p0_avg_bw 0 hisi_sicl10_cpa0/cpa_p0_wr_dat/ 0 hisi_sicl10_cpa0/cpa_p0_rd_dat_64b/ 0 hisi_sicl10_cpa0/cpa_p0_rd_dat_32b/ 19,417,730,679 hisi_sicl2_cpa0/cpa_cycles/ # 0.31 cpa_p0_avg_bw 75,635,749 hisi_sicl2_cpa0/cpa_p0_wr_dat/ 18,520,640 hisi_sicl2_cpa0/cpa_p0_rd_dat_64b/ 0 hisi_sicl2_cpa0/cpa_p0_rd_dat_32b/ 19,417,674,227 hisi_sicl8_cpa0/cpa_cycles/ # 0.00 cpa_p0_avg_bw 0 hisi_sicl8_cpa0/cpa_p0_wr_dat/ 0 hisi_sicl8_cpa0/cpa_p0_rd_dat_64b/ 0 hisi_sicl8_cpa0/cpa_p0_rd_dat_32b/ 19.417734480 seconds time elapsed With --pmu-filter, users can select only hisi_sicl2_cpa0 PMU. # perf stat --pmu-filter hisi_sicl2_cpa0 -M cpa_p0_avg_bw Performance counter stats for 'system wide': 6,234,093,559 cpa_cycles # 0.60 cpa_p0_avg_bw 50,548,465 cpa_p0_wr_dat 7,552,182 cpa_p0_rd_dat_64b 0 cpa_p0_rd_dat_32b 6.234139320 seconds time elapsed Data type profiling: - Quality improvements by tracking register state more precisely - Ensure array members to get the type - Handle more cases for global variables Vendor event/metric updates: - Update various Intel events and metrics - Add NVIDIA Tegra 410 Olympus events Internal changes: - Verify perf.data header for maliciously crafted files - Update perf test to cover more usages and make them robust - Move a couple of copied kernel headers not to annoy objtool build - Fix a bug in map sorting in name order - Remove some unused codes Misc: - Fix module symbol resolution with non-zero text address - Add -t/--threads option to `perf bench mem mmap` - Track duration of exit*() syscall by `perf trace -s` - Add core.addr2line-timeout and core.addr2line-disable-warn config items" * tag 'perf-tools-for-v7.1-2026-04-17' of git://git.kernel.org/pub/scm/linux/kernel/git/perf/perf-tools: (131 commits) perf loongarch: Fix build failure with CONFIG_LIBDW_DWARF_UNWIND perf annotate: Use jump__delete when freeing LoongArch jumps perf test: Fixes for check branch stack sampling perf test: Fix inet_pton probe failure and unroll call graph perf build: fix "argument list too long" in second location perf header: Add sanity checks to HEADER_BPF_BTF processing perf header: Sanity check HEADER_BPF_PROG_INFO perf header: Sanity check HEADER_PMU_CAPS perf header: Sanity check HEADER_HYBRID_TOPOLOGY perf header: Sanity check HEADER_CACHE perf header: Sanity check HEADER_GROUP_DESC perf header: Sanity check HEADER_PMU_MAPPINGS perf header: Sanity check HEADER_MEM_TOPOLOGY perf header: Sanity check HEADER_NUMA_TOPOLOGY perf header: Sanity check HEADER_CPU_TOPOLOGY perf header: Sanity check HEADER_NRCPUS and HEADER_CPU_DOMAIN_INFO perf header: Bump up the max number of command line args allowed perf header: Validate nr_domains when reading HEADER_CPU_DOMAIN_INFO perf sample: Fix documentation typo perf arm_spe: Improve SIMD flags setting ...