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linux-stable-mirror/tools/testing/selftests/mm/Makefile
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Breno Leitao cfaef29c20 selftests/mm: add kmemleak verbose dedup test 
Add a regression test for the per-scan verbose dedup added in the
preceding commit.  The test loads samples/kmemleak's helper module
(CONFIG_SAMPLE_KMEMLEAK=m) to generate orphan allocations, several of
which share an allocation backtrace, runs four kmemleak scans with verbose
printing enabled, then walks dmesg looking for two "unreferenced object"
reports within a single scan that share an identical backtrace - which
would mean dedup failed to collapse them.

The test is intentionally permissive on detection but strict on
regressions:

 - PASS when no duplicates are observed, regardless of whether the
   dedup summary line ("... and N more object(s) with the same
   backtrace") was actually emitted. Per-CPU chunk reuse, slab
   freelist pointers, kernel stack residue and CONFIG_DEBUG_KMEMLEAK_
   AUTO_SCAN can all keep most of the orphans "still referenced" or
   reported across many separate scans, so the dedup path may have
   nothing to fold within one scan. That is not a regression.

 - PASS reports whether dedup actually fired, so a passing run on a
   well-behaved environment is still informative.

 - FAIL when two same-backtrace reports land in a single scan (clear
   dedup regression).

 - FAIL when kmemleak's own per-scan tally counts leaks but the
   verbose path emits zero "unreferenced object" lines - that catches
   a regression in the verbose printer itself, which would otherwise
   pass the duplicate check trivially.

 - SKIP when kmemleak is absent, disabled at runtime, or the helper
   module is not built.

The dmesg parser anchors stack-frame matching to the indentation kmemleak
uses for them (4+ spaces under "kmemleak: ") so unrelated kmemleak
warnings landing between reports do not get lumped into the backtrace key
and mask a duplicate.

Link: https://lore.kernel.org/20260506-kmemleak_dedup-v3-2-2d36aafc34da@debian.org
Signed-off-by: Breno Leitao <leitao@debian.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>
Cc: David Hildenbrand <david@kernel.org>
Cc: Liam R. Howlett <liam@infradead.org>
Cc: Lorenzo Stoakes <ljs@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Suren Baghdasaryan <surenb@google.com>
Cc: Vlastimil Babka <vbabka@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-05-28 21:05:09 -07:00

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Makefile
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# SPDX-License-Identifier: GPL-2.0
# Makefile for mm selftests
# IMPORTANT: If you add a new test CATEGORY please add a simple wrapper
# script so kunit knows to run it, and add it to the list below.
# If you do not YOUR TESTS WILL NOT RUN IN THE CI.
LOCAL_HDRS += $(selfdir)/mm/local_config.h $(top_srcdir)/mm/gup_test.h
LOCAL_HDRS += $(selfdir)/mm/mseal_helpers.h
include local_config.mk
ifeq ($(ARCH),)
ifeq ($(CROSS_COMPILE),)
uname_M := $(shell uname -m 2>/dev/null || echo not)
else
uname_M := $(shell echo $(CROSS_COMPILE) | grep -o '^[a-z0-9]\+')
endif
ARCH ?= $(shell echo $(uname_M) | sed -e 's/aarch64.*/arm64/' -e 's/ppc64.*/powerpc/')
endif
# Without this, failed build products remain, with up-to-date timestamps,
# thus tricking Make (and you!) into believing that All Is Well, in subsequent
# make invocations:
.DELETE_ON_ERROR:
# Avoid accidental wrong builds, due to built-in rules working just a little
# bit too well--but not quite as well as required for our situation here.
#
# In other words, "make $SOME_TEST" is supposed to fail to build at all,
# because this Makefile only supports either "make" (all), or "make /full/path".
# However, the built-in rules, if not suppressed, will pick up CFLAGS and the
# initial LDLIBS (but not the target-specific LDLIBS, because those are only
# set for the full path target!). This causes it to get pretty far into building
# things despite using incorrect values such as an *occasionally* incomplete
# LDLIBS.
MAKEFLAGS += --no-builtin-rules
CFLAGS = -Wall -O2 -I $(top_srcdir) $(EXTRA_CFLAGS) $(KHDR_INCLUDES) $(TOOLS_INCLUDES)
CFLAGS += -Wunreachable-code
LDLIBS = -lrt -lpthread -lm
# Some distributions (such as Ubuntu) configure GCC so that _FORTIFY_SOURCE is
# automatically enabled at -O1 or above. This triggers various unused-result
# warnings where functions such as read() or write() are called and their
# return value is not checked. Disable _FORTIFY_SOURCE to silence those
# warnings.
CFLAGS += -U_FORTIFY_SOURCE
KDIR ?= $(if $(O),$(O),$(realpath ../../../..))
ifneq (,$(wildcard $(KDIR)/Module.symvers))
TEST_GEN_MODS_DIR := page_frag
else
PAGE_FRAG_WARNING = "missing Module.symvers, please have the kernel built first"
endif
TEST_GEN_FILES = cow
TEST_GEN_FILES += compaction_test
TEST_GEN_FILES += gup_longterm
TEST_GEN_FILES += gup_test
TEST_GEN_FILES += hmm-tests
TEST_GEN_FILES += hugetlb-madvise
TEST_GEN_FILES += hugetlb-read-hwpoison
TEST_GEN_FILES += hugetlb-soft-offline
TEST_GEN_FILES += hugepage-mmap
TEST_GEN_FILES += hugepage-mremap
TEST_GEN_FILES += hugepage-shm
TEST_GEN_FILES += hugepage-vmemmap
TEST_GEN_FILES += khugepaged
TEST_GEN_FILES += madv_populate
TEST_GEN_FILES += map_fixed_noreplace
TEST_GEN_FILES += map_hugetlb
TEST_GEN_FILES += map_populate
ifneq (,$(filter $(ARCH),arm64 riscv riscv64 x86 x86_64 loongarch32 loongarch64))
TEST_GEN_FILES += memfd_secret
endif
TEST_GEN_FILES += memory-failure
TEST_GEN_FILES += migration
TEST_GEN_FILES += mkdirty
TEST_GEN_FILES += mlock-random-test
TEST_GEN_FILES += mlock2-tests
TEST_GEN_FILES += mrelease_test
TEST_GEN_FILES += mremap_dontunmap
TEST_GEN_FILES += mremap_test
TEST_GEN_FILES += mseal_test
TEST_GEN_FILES += on-fault-limit
TEST_GEN_FILES += pagemap_ioctl
TEST_GEN_FILES += pfnmap
TEST_GEN_FILES += process_madv
TEST_GEN_FILES += prctl_thp_disable
TEST_GEN_FILES += thuge-gen
TEST_GEN_FILES += transhuge-stress
TEST_GEN_FILES += uffd-stress
TEST_GEN_FILES += uffd-unit-tests
TEST_GEN_FILES += uffd-wp-mremap
TEST_GEN_FILES += split_huge_page_test
TEST_GEN_FILES += ksm_tests
TEST_GEN_FILES += ksm_functional_tests
TEST_GEN_FILES += mdwe_test
TEST_GEN_FILES += hugetlb_fault_after_madv
TEST_GEN_FILES += hugetlb_madv_vs_map
TEST_GEN_FILES += hugetlb_dio
TEST_GEN_FILES += droppable
TEST_GEN_FILES += guard-regions
TEST_GEN_FILES += merge
TEST_GEN_FILES += rmap
TEST_GEN_FILES += folio_split_race_test
ifneq ($(ARCH),arm64)
TEST_GEN_FILES += soft-dirty
endif
ifeq ($(ARCH),x86_64)
CAN_BUILD_I386 := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_32bit_program.c -m32)
CAN_BUILD_X86_64 := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_64bit_program.c)
CAN_BUILD_WITH_NOPIE := $(shell ./../x86/check_cc.sh "$(CC)" ../x86/trivial_program.c -no-pie)
VMTARGETS := protection_keys
VMTARGETS += pkey_sighandler_tests
BINARIES_32 := $(VMTARGETS:%=%_32)
BINARIES_64 := $(VMTARGETS:%=%_64)
ifeq ($(CAN_BUILD_WITH_NOPIE),1)
CFLAGS += -no-pie
endif
ifeq ($(CAN_BUILD_I386),1)
TEST_GEN_FILES += $(BINARIES_32)
endif
ifeq ($(CAN_BUILD_X86_64),1)
TEST_GEN_FILES += $(BINARIES_64)
endif
else ifeq ($(ARCH),arm64)
TEST_GEN_FILES += protection_keys
TEST_GEN_FILES += pkey_sighandler_tests
else ifeq ($(ARCH),powerpc)
TEST_GEN_FILES += protection_keys
endif
ifneq (,$(filter $(ARCH),arm64 mips64 parisc64 powerpc riscv64 s390x sparc64 x86_64 s390))
TEST_GEN_FILES += va_high_addr_switch
TEST_GEN_FILES += write_to_hugetlbfs
endif
TEST_PROGS += ksft_compaction.sh
TEST_PROGS += ksft_cow.sh
TEST_PROGS += ksft_gup_test.sh
TEST_PROGS += ksft_hmm.sh
TEST_PROGS += ksft_hugetlb.sh
TEST_PROGS += ksft_hugevm.sh
TEST_PROGS += ksft_kmemleak_dedup.sh
TEST_PROGS += ksft_ksm.sh
TEST_PROGS += ksft_ksm_numa.sh
TEST_PROGS += ksft_madv_guard.sh
TEST_PROGS += ksft_madv_populate.sh
TEST_PROGS += ksft_memfd_secret.sh
TEST_PROGS += ksft_memory_failure.sh
TEST_PROGS += ksft_migration.sh
TEST_PROGS += ksft_mkdirty.sh
TEST_PROGS += ksft_mlock.sh
TEST_PROGS += ksft_mmap.sh
TEST_PROGS += ksft_mremap.sh
TEST_PROGS += ksft_pagemap.sh
TEST_PROGS += ksft_pfnmap.sh
TEST_PROGS += ksft_pkey.sh
TEST_PROGS += ksft_process_madv.sh
TEST_PROGS += ksft_process_mrelease.sh
TEST_PROGS += ksft_rmap.sh
TEST_PROGS += ksft_soft_dirty.sh
TEST_PROGS += ksft_thp.sh
TEST_PROGS += ksft_userfaultfd.sh
TEST_PROGS += ksft_vma_merge.sh
TEST_PROGS += ksft_vmalloc.sh
TEST_FILES := test_vmalloc.sh
TEST_FILES += test_hmm.sh
TEST_FILES += va_high_addr_switch.sh
TEST_FILES += charge_reserved_hugetlb.sh
TEST_FILES += hugetlb_reparenting_test.sh
TEST_FILES += test_page_frag.sh
TEST_FILES += run_vmtests.sh
# required by charge_reserved_hugetlb.sh
TEST_FILES += write_hugetlb_memory.sh
include ../lib.mk
$(TEST_GEN_PROGS): vm_util.c thp_settings.c
$(TEST_GEN_FILES): vm_util.c thp_settings.c
$(OUTPUT)/uffd-stress: uffd-common.c
$(OUTPUT)/uffd-unit-tests: uffd-common.c
$(OUTPUT)/uffd-wp-mremap: uffd-common.c
$(OUTPUT)/protection_keys: pkey_util.c
$(OUTPUT)/pkey_sighandler_tests: pkey_util.c
ifeq ($(ARCH),x86_64)
BINARIES_32 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_32))
BINARIES_64 := $(patsubst %,$(OUTPUT)/%,$(BINARIES_64))
$(BINARIES_32) $(BINARIES_64): pkey_util.c
define gen-target-rule-32
$(1) $(1)_32: $(OUTPUT)/$(1)_32
.PHONY: $(1) $(1)_32
endef
define gen-target-rule-64
$(1) $(1)_64: $(OUTPUT)/$(1)_64
.PHONY: $(1) $(1)_64
endef
ifeq ($(CAN_BUILD_I386),1)
$(BINARIES_32): CFLAGS += -m32 -mxsave
$(BINARIES_32): LDLIBS += -lrt -ldl -lm
$(BINARIES_32): $(OUTPUT)/%_32: %.c
$(call msg,CC,,$@)
$(Q)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(notdir $^) $(LDLIBS) -o $@
$(foreach t,$(VMTARGETS),$(eval $(call gen-target-rule-32,$(t))))
endif
ifeq ($(CAN_BUILD_X86_64),1)
$(BINARIES_64): CFLAGS += -m64 -mxsave
$(BINARIES_64): LDLIBS += -lrt -ldl
$(BINARIES_64): $(OUTPUT)/%_64: %.c
$(call msg,CC,,$@)
$(Q)$(CC) $(CFLAGS) $(EXTRA_CFLAGS) $(notdir $^) $(LDLIBS) -o $@
$(foreach t,$(VMTARGETS),$(eval $(call gen-target-rule-64,$(t))))
endif
# x86_64 users should be encouraged to install 32-bit libraries
ifeq ($(CAN_BUILD_I386)$(CAN_BUILD_X86_64),01)
all: warn_32bit_failure
warn_32bit_failure:
@echo "Warning: you seem to have a broken 32-bit build" 2>&1; \
echo "environment. This will reduce test coverage of 64-bit" 2>&1; \
echo "kernels. If you are using a Debian-like distribution," 2>&1; \
echo "try:"; 2>&1; \
echo ""; \
echo " apt-get install gcc-multilib libc6-i386 libc6-dev-i386"; \
echo ""; \
echo "If you are using a Fedora-like distribution, try:"; \
echo ""; \
echo " yum install glibc-devel.*i686"; \
exit 0;
endif
endif
# IOURING_EXTRA_LIBS may get set in local_config.mk, or it may be left empty.
$(OUTPUT)/cow: LDLIBS += $(IOURING_EXTRA_LIBS)
$(OUTPUT)/gup_longterm: LDLIBS += $(IOURING_EXTRA_LIBS)
$(OUTPUT)/mlock-random-test $(OUTPUT)/memfd_secret: LDLIBS += -lcap
$(OUTPUT)/ksm_tests: LDLIBS += -lnuma
$(OUTPUT)/migration: LDLIBS += -lnuma
$(OUTPUT)/rmap: LDLIBS += -lnuma
local_config.mk local_config.h: check_config.sh
$(call msg,CHK,config,$@)
$(Q)CC="$(CC)" CFLAGS="$(CFLAGS)" ./check_config.sh
EXTRA_CLEAN += local_config.mk local_config.h
ifeq ($(IOURING_EXTRA_LIBS),)
all: warn_missing_liburing
warn_missing_liburing:
@echo ; \
echo "Warning: missing liburing support. Some tests will be skipped." ; \
echo
endif
ifneq ($(PAGE_FRAG_WARNING),)
all: warn_missing_page_frag
warn_missing_page_frag:
@echo ; \
echo "Warning: $(PAGE_FRAG_WARNING). page_frag test will be skipped." ; \
echo
endif
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