June 2025 - Linux-kselftest-mirror

[PATCH] selftests/mm: Skip uprobe vma merge test if uprobes are not enabled

by Pedro Falcato

If uprobes are not enabled, the test currently fails with: 7151 12:46:54.627936 # # # RUN merge.handle_uprobe_upon_merged_vma ... 7152 12:46:54.639014 # # f /sys/bus/event_source/devices/uprobe/type 7153 12:46:54.639306 # # fopen: No such file or directory 7154 12:46:54.650451 # # # merge.c:473:handle_uprobe_upon_merged_vma:Expected read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type) (1) == 0 (0) 7155 12:46:54.650730 # # # handle_uprobe_upon_merged_vma: Test terminated by assertion 7156 12:46:54.661750 # # # FAIL merge.handle_uprobe_upon_merged_vma 7157 12:46:54.662030 # # not ok 8 merge.handle_uprobe_upon_merged_vma Skipping is a more sane and friendly behavior here. Fixes: efe99fabeb11b ("selftests/mm: add test about uprobe pte be orphan during vma merge") Reported-by: Aishwarya <aishwarya.tcv(a)arm.com> Closes: https://lore.kernel.org/linux-mm/20250610103729.72440-1-aishwarya.tcv@arm.c… Signed-off-by: Pedro Falcato <pfalcato(a)suse.de> --- tools/testing/selftests/mm/merge.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/merge.c b/tools/testing/selftests/mm/merge.c index bbae66fc5038..cc26480098ae 100644 --- a/tools/testing/selftests/mm/merge.c +++ b/tools/testing/selftests/mm/merge.c @@ -470,7 +470,9 @@ TEST_F(merge, handle_uprobe_upon_merged_vma) ASSERT_GE(fd, 0); ASSERT_EQ(ftruncate(fd, page_size), 0); - ASSERT_EQ(read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type), 0); + if (read_sysfs("/sys/bus/event_source/devices/uprobe/type", &type) != 0) { + SKIP(goto out, "Failed to read uprobe sysfs file, skipping"); + } memset(&attr, 0, attr_sz); attr.size = attr_sz; @@ -491,6 +493,7 @@ TEST_F(merge, handle_uprobe_upon_merged_vma) ASSERT_NE(mremap(ptr2, page_size, page_size, MREMAP_MAYMOVE | MREMAP_FIXED, ptr1), MAP_FAILED); +out: close(fd); remove(probe_file); } -- 2.49.0

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[PATCH] selftests/mm: Check for YAMA ptrace_scope configuraiton before modifying it

by Mark Brown

When running the memfd_secret test run_vmtests.sh unconditionally tries to confgiure the YAMA LSM's ptrace_scope configuration, leading to an error if YAMA is not in the running kernel: # ./run_vmtests.sh: line 432: /proc/sys/kernel/yama/ptrace_scope: No such file or directory # # ---------------------- # # running ./memfd_secret # # ---------------------- Check that this file is present before trying to write to it. The indentation here is a bit odd, and it doesn't seem great that we configure but don't restore ptrace_scope. Signed-off-by: Mark Brown <broonie(a)kernel.org> --- tools/testing/selftests/mm/run_vmtests.sh | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/mm/run_vmtests.sh b/tools/testing/selftests/mm/run_vmtests.sh index dddd1dd8af14..33fc7fafa8f9 100755 --- a/tools/testing/selftests/mm/run_vmtests.sh +++ b/tools/testing/selftests/mm/run_vmtests.sh @@ -429,7 +429,9 @@ CATEGORY="vma_merge" run_test ./merge if [ -x ./memfd_secret ] then -(echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix +if [ -f /proc/sys/kernel/yama/ptrace_scope ]; then + (echo 0 > /proc/sys/kernel/yama/ptrace_scope 2>&1) | tap_prefix +fi CATEGORY="memfd_secret" run_test ./memfd_secret fi --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250605-selftest-mm-enable-yama-1541c2d2ddcd Best regards, -- Mark Brown <broonie(a)kernel.org>

1 month

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[PATCH V3 2/2] KVM: selftests: Change MDSCR_EL1 register holding variables as uint64_t

by Anshuman Khandual

Change MDSCR_EL1 register holding local variables as uint64_t that reflects its true register width as well. Cc: Marc Zyngier <maz(a)kernel.org> Cc: Oliver Upton <oliver.upton(a)linux.dev> Cc: Joey Gouly <joey.gouly(a)arm.com> Cc: kvm(a)vger.kernel.org Cc: kvmarm(a)lists.linux.dev Cc: linux-kernel(a)vger.kernel.org Cc: linux-kselftest(a)vger.kernel.org Cc: linux-arm-kernel(a)lists.infradead.org Reviewed-by: Ada Couprie Diaz <ada.coupriediaz(a)arm.com> Signed-off-by: Anshuman Khandual <anshuman.khandual(a)arm.com> --- tools/testing/selftests/kvm/arm64/debug-exceptions.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/kvm/arm64/debug-exceptions.c b/tools/testing/selftests/kvm/arm64/debug-exceptions.c index c7fb55c9135b..e34963956fbc 100644 --- a/tools/testing/selftests/kvm/arm64/debug-exceptions.c +++ b/tools/testing/selftests/kvm/arm64/debug-exceptions.c @@ -140,7 +140,7 @@ static void enable_os_lock(void) static void enable_monitor_debug_exceptions(void) { - uint32_t mdscr; + uint64_t mdscr; asm volatile("msr daifclr, #8"); @@ -223,7 +223,7 @@ void install_hw_bp_ctx(uint8_t addr_bp, uint8_t ctx_bp, uint64_t addr, static void install_ss(void) { - uint32_t mdscr; + uint64_t mdscr; asm volatile("msr daifclr, #8"); -- 2.25.1

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[PATCH 0/4] selftests/mm: Tweaks to the cow test

by Mark Brown

A collection of non-functional updates from David Hildenbrand's review. Signed-off-by: Mark Brown <broonie(a)kernel.org> --- Mark Brown (4): kselftest/mm: Clarify errors for pipe() selftests/mm: Convert some cow error reports to ksft_perror() selftests/mm: Don't compare return values to in cow selftests/mm: Add messages about test errors to the cow tests tools/testing/selftests/mm/cow.c | 44 +++++++++++++++++++++++++--------------- 1 file changed, 28 insertions(+), 16 deletions(-) --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250603-selftest-mm-cow-tweaks-0199c5132b3e Best regards, -- Mark Brown <broonie(a)kernel.org>

1 month

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[PATCH v3 0/9] selftests: vDSO: Some cleanups and (warning) fixes

by Thomas Weißschuh

Fixes and cleanups for various issues in the vDSO selftests. Signed-off-by: Thomas Weißschuh <thomas.weissschuh(a)linutronix.de> --- Changes in v3: - Rebase on v6.16-rc1 - Preserve vgetrandom_put_state() - Pick up vdso_standalone_test_x86 into this series - Link to v2: https://lore.kernel.org/r/20250505-selftests-vdso-fixes-v2-0-3bc86e42f242@l… Changes in v2: - Refer to -Wstrict-prototypes over -Wold-style-prototypes - Pick up Acks - Enable fixed warnings in Makefile - Link to v1: https://lore.kernel.org/r/20250502-selftests-vdso-fixes-v1-0-fb5d640a4f78@l… --- Thomas Weißschuh (9): selftests: vDSO: chacha: Correctly skip test if necessary selftests: vDSO: clock_getres: Drop unused include of err.h selftests: vDSO: vdso_test_getrandom: Drop unused include of linux/compiler.h selftests: vDSO: vdso_test_getrandom: Avoid -Wunused selftests: vDSO: vdso_config: Avoid -Wunused-variables selftests: vDSO: enable -Wall selftests: vDSO: vdso_test_correctness: Fix -Wstrict-prototypes selftests: vDSO: vdso_test_getrandom: Always print TAP header selftests: vDSO: vdso_standalone_test_x86: Replace source file with symlink tools/testing/selftests/vDSO/Makefile | 2 +- tools/testing/selftests/vDSO/vdso_config.h | 2 + .../selftests/vDSO/vdso_standalone_test_x86.c | 59 +--------------------- tools/testing/selftests/vDSO/vdso_test_chacha.c | 3 +- .../selftests/vDSO/vdso_test_clock_getres.c | 1 - .../testing/selftests/vDSO/vdso_test_correctness.c | 2 +- tools/testing/selftests/vDSO/vdso_test_getrandom.c | 10 ++-- 7 files changed, 13 insertions(+), 66 deletions(-) --- base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494 change-id: 20250423-selftests-vdso-fixes-d2ce74142359 Best regards, -- Thomas Weißschuh <thomas.weissschuh(a)linutronix.de>

1 month

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nolibc test target overwites kernel config without asking

by Mark Brown

Hi, While running the nolibc tests I discovered that they build a kernel in the current directory, including overwriting the existing .config. This is rather suprising for the selftests build system - it usually wouldn't do a kernel build at all - and might be annoying for users. KUnit deals with this by doing it's kernel build in a .kunit directory, it'd probably be good to do something similar for nolibc. Thanks, Mark

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[PATCH v2] selftests/mm: Use generic read_sysfs in thuge-gen test

by Pu Lehui

From: Pu Lehui <pulehui(a)huawei.com> As generic read_sysfs is available in vm_utils, let's use is in thuge-gen test. Signed-off-by: Pu Lehui <pulehui(a)huawei.com> Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> --- v2: - Explicit warning when ps != getpagesize(). (Lorenzo) tools/testing/selftests/mm/thuge-gen.c | 38 +++++++------------------- 1 file changed, 10 insertions(+), 28 deletions(-) diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c index 95b6f043a3cb..8e2b08dc5762 100644 --- a/tools/testing/selftests/mm/thuge-gen.c +++ b/tools/testing/selftests/mm/thuge-gen.c @@ -77,40 +77,20 @@ void show(unsigned long ps) system(buf); } -unsigned long thuge_read_sysfs(int warn, char *fmt, ...) +unsigned long read_free(unsigned long ps) { - char *line = NULL; - size_t linelen = 0; - char buf[100]; - FILE *f; - va_list ap; unsigned long val = 0; + char buf[100]; - va_start(ap, fmt); - vsnprintf(buf, sizeof buf, fmt, ap); - va_end(ap); + snprintf(buf, sizeof(buf), + "/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages", + ps >> 10); + if (read_sysfs(buf, &val) && ps != getpagesize()) + ksft_print_msg("missing %s\n", buf); - f = fopen(buf, "r"); - if (!f) { - if (warn) - ksft_print_msg("missing %s\n", buf); - return 0; - } - if (getline(&line, &linelen, f) > 0) { - sscanf(line, "%lu", &val); - } - fclose(f); - free(line); return val; } -unsigned long read_free(unsigned long ps) -{ - return thuge_read_sysfs(ps != getpagesize(), - "/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages", - ps >> 10); -} - void test_mmap(unsigned long size, unsigned flags) { char *map; @@ -173,6 +153,7 @@ void test_shmget(unsigned long size, unsigned flags) void find_pagesizes(void) { unsigned long largest = getpagesize(); + unsigned long shmmax_val = 0; int i; glob_t g; @@ -195,7 +176,8 @@ void find_pagesizes(void) } globfree(&g); - if (thuge_read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest) + read_sysfs("/proc/sys/kernel/shmmax", &shmmax_val); + if (shmmax_val < NUM_PAGES * largest) ksft_exit_fail_msg("Please do echo %lu > /proc/sys/kernel/shmmax", largest * NUM_PAGES); -- 2.34.1

1 month

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[PATCH] selftests/mm: Use generic read_sysfs in thuge-gen test

by Pu Lehui

From: Pu Lehui <pulehui(a)huawei.com> As generic read_sysfs is available in vm_utils, let's use is in thuge-gen test. Signed-off-by: Pu Lehui <pulehui(a)huawei.com> --- tools/testing/selftests/mm/thuge-gen.c | 37 +++++++------------------- 1 file changed, 9 insertions(+), 28 deletions(-) diff --git a/tools/testing/selftests/mm/thuge-gen.c b/tools/testing/selftests/mm/thuge-gen.c index 95b6f043a3cb..e11dfbfa661b 100644 --- a/tools/testing/selftests/mm/thuge-gen.c +++ b/tools/testing/selftests/mm/thuge-gen.c @@ -77,40 +77,19 @@ void show(unsigned long ps) system(buf); } -unsigned long thuge_read_sysfs(int warn, char *fmt, ...) +unsigned long read_free(unsigned long ps) { - char *line = NULL; - size_t linelen = 0; - char buf[100]; - FILE *f; - va_list ap; unsigned long val = 0; + char buf[100]; - va_start(ap, fmt); - vsnprintf(buf, sizeof buf, fmt, ap); - va_end(ap); + snprintf(buf, sizeof(buf), + "/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages", + ps >> 10); + read_sysfs(buf, &val); - f = fopen(buf, "r"); - if (!f) { - if (warn) - ksft_print_msg("missing %s\n", buf); - return 0; - } - if (getline(&line, &linelen, f) > 0) { - sscanf(line, "%lu", &val); - } - fclose(f); - free(line); return val; } -unsigned long read_free(unsigned long ps) -{ - return thuge_read_sysfs(ps != getpagesize(), - "/sys/kernel/mm/hugepages/hugepages-%lukB/free_hugepages", - ps >> 10); -} - void test_mmap(unsigned long size, unsigned flags) { char *map; @@ -173,6 +152,7 @@ void test_shmget(unsigned long size, unsigned flags) void find_pagesizes(void) { unsigned long largest = getpagesize(); + unsigned long shmmax_val = 0; int i; glob_t g; @@ -195,7 +175,8 @@ void find_pagesizes(void) } globfree(&g); - if (thuge_read_sysfs(0, "/proc/sys/kernel/shmmax") < NUM_PAGES * largest) + read_sysfs("/proc/sys/kernel/shmmax", &shmmax_val); + if (shmmax_val < NUM_PAGES * largest) ksft_exit_fail_msg("Please do echo %lu > /proc/sys/kernel/shmmax", largest * NUM_PAGES); -- 2.34.1

1 month

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[PATCH] Documentation: kunit: fix argument of MODULE_IMPORT_NS()

by Thomas Weißschuh

The argument to MODULE_IMPORT_NS() should be a string literal. See commit cdd30ebb1b9f ("module: Convert symbol namespace to string literal") Fixes: d208025db6d6 ("Documentation: kunit: improve example on testing static functions") Signed-off-by: Thomas Weißschuh <thomas.weissschuh(a)linutronix.de> --- Documentation/dev-tools/kunit/usage.rst | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/Documentation/dev-tools/kunit/usage.rst b/Documentation/dev-tools/kunit/usage.rst index 038f480074fd7aaa1f8e1b344bc74bf3426cc173..066ecda1dd98e73a01d50545e79c38a99a3e05a2 100644 --- a/Documentation/dev-tools/kunit/usage.rst +++ b/Documentation/dev-tools/kunit/usage.rst @@ -699,7 +699,7 @@ the template below. #include <kunit/visibility.h> #include <my_file.h> ... - MODULE_IMPORT_NS(EXPORTED_FOR_KUNIT_TESTING); + MODULE_IMPORT_NS("EXPORTED_FOR_KUNIT_TESTING"); ... // Use do_interesting_thing() in tests --- base-commit: f09079bd04a924c72d555cd97942d5f8d7eca98c change-id: 20250611-kunit-example-d195e41c0b34 Best regards, -- Thomas Weißschuh <thomas.weissschuh(a)linutronix.de>

1 month

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[PATCH net-next 0/7] netpoll: Untangle netconsole and netpoll

by Breno Leitao

Initially netpoll and netconsole were created together, and some functions are in the wrong file. Seperate netconsole-only functions in netconsole, avoiding exports. 1. Expose netpoll logging macros in the public header to enable consistent log formatting across netpoll consumers. 2. Relocate netconsole-specific functions from netpoll to the netconsole module where they are actually used, reducing unnecessary coupling. 3. Remove unnecessary function exports 4. Rename netpoll parsing functions in netconsole to better reflect their specific usage. 5. Create a test to check that cmdline works fine. This was in my todo list since [1], this was a good time to add it here to make sure this patchset doesn't regress. PS: The code was split in a way that it is easy to review. When copying the functions from netpoll to netconsole, I do not change than other than adding `static`. This will make checkpatch unhappy, but, further patches will address the issues. It is done this way to make it easy for reviewers. Link: https://lore.kernel.org/netdev/Z36TlACdNMwFD7wv@dev-ushankar.dev.purestorag… [1] Signed-off-by: Breno Leitao <leitao(a)debian.org> --- Breno Leitao (7): netpoll: remove __netpoll_cleanup from exported API netpoll: expose netpoll logging macros in public header netpoll: relocate netconsole-specific functions to netconsole module netpoll: move netpoll_print_options to netconsole netconsole: rename functions to better reflect their purpose netconsole: improve code style in parser function selftest: netconsole: add test for cmdline configuration drivers/net/netconsole.c | 137 ++++++++++++++++++++- include/linux/netpoll.h | 10 +- net/core/netpoll.c | 136 +------------------- tools/testing/selftests/drivers/net/Makefile | 1 + .../selftests/drivers/net/lib/sh/lib_netcons.sh | 39 +++++- .../selftests/drivers/net/netcons_cmdline.sh | 52 ++++++++ 6 files changed, 228 insertions(+), 147 deletions(-) --- base-commit: 2c7e4a2663a1ab5a740c59c31991579b6b865a26 change-id: 20250603-rework-c175cad8d22e Best regards, -- Breno Leitao <leitao(a)debian.org>

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Linux-kselftest-mirror June 2025