From 2b97956af60810cd382b86b9ce9aea421b889861 Mon Sep 17 00:00:00 2001 From: Nuoqi Gui Date: Fri, 4 Sep 2026 12:41:55 +0200 Subject: selftests/bpf: Test rhtab kptr cancellation semantics Resizable hash-map updates and deletions must not perform full special-field destruction in their caller context. In particular, a referenced kptr must remain attached to the allocation until the memory allocator destructor can release it safely. Add separate coverage for both affected paths. The update test stores a task kptr, replaces the ordinary value bytes with BPF_EXIST, and verifies that the kptr survived. The delete test removes an element and exchanges its kptr through the still-valid map-value pointer before the allocation is reclaimed. Both cases observe a NULL kptr when rhtab uses bpf_obj_free_fields(). They recover and release the reference after rhtab switches to cancellation semantics. Signed-off-by: Nuoqi Gui [ kkd: Split update and delete coverage and rewrote the commit log ] Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904104203.345917-5-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- tools/perf/scripts/Build | 30 ++++++++++++++++++++++++++++++ 1 file changed, 30 insertions(+) create mode 100644 tools/perf/scripts/Build (limited to 'tools/perf/scripts/Build') diff --git a/tools/perf/scripts/Build b/tools/perf/scripts/Build new file mode 100644 index 000000000..91229a1fe --- /dev/null +++ b/tools/perf/scripts/Build @@ -0,0 +1,30 @@ +ifeq ($(CONFIG_LIBTRACEEVENT),y) + perf-util-$(CONFIG_LIBPERL) += perl/Perf-Trace-Util/ +endif +perf-util-$(CONFIG_LIBPYTHON) += python/Perf-Trace-Util/ + +ifdef MYPY + PY_TESTS := $(shell find python -type f -name '*.py') + MYPY_TEST_LOGS := $(PY_TESTS:python/%=python/%.mypy_log) +else + MYPY_TEST_LOGS := +endif + +$(OUTPUT)%.mypy_log: % + $(call rule_mkdir) + $(Q)$(call echo-cmd,test)mypy "$<" > $@ || (cat $@ && rm $@ && false) + +perf-y += $(MYPY_TEST_LOGS) + +ifdef PYLINT + PY_TESTS := $(shell find python -type f -name '*.py') + PYLINT_TEST_LOGS := $(PY_TESTS:python/%=python/%.pylint_log) +else + PYLINT_TEST_LOGS := +endif + +$(OUTPUT)%.pylint_log: % + $(call rule_mkdir) + $(Q)$(call echo-cmd,test)pylint "$<" > $@ || (cat $@ && rm $@ && false) + +perf-y += $(PYLINT_TEST_LOGS) -- cgit v1.3.1