- Linux-kselftest-mirror - lists.linaro.org

[PATCH net-next 1/2] selftests: drv-net: adjust tests before defaulting to shell=False

by Jakub Kicinski

Clean up tests which expect shell=True without explicitly passing that param to cmd(). There seems to be only one such case, and in fact it's better converted to a direct write. Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> --- tools/testing/selftests/drivers/net/napi_threaded.py | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/tools/testing/selftests/drivers/net/napi_threaded.py b/tools/testing/selftests/drivers/net/napi_threaded.py index ed66efa481b0..f4be72b2145a 100755 --- a/tools/testing/selftests/drivers/net/napi_threaded.py +++ b/tools/testing/selftests/drivers/net/napi_threaded.py @@ -24,7 +24,8 @@ from lib.py import cmd, defer, ethtool def _set_threaded_state(cfg, threaded) -> None: - cmd(f"echo {threaded} > /sys/class/net/{cfg.ifname}/threaded") + with open(f"/sys/class/net/{cfg.ifname}/threaded", "wb") as fp: + fp.write(str(threaded).encode('utf-8')) def _setup_deferred_cleanup(cfg) -> None: -- 2.51.0

2 months

3
6
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[PATCH net-next] net: selftests: clean up tools/testing/selftests/net/lib/py/utils.py

by Breno Leitao

This patch improves the utils.py module by removing unused imports (errno, random), simplifying the fd_read_timeout() function by eliminating unnecessary else clause, and cleaning up code style in the defer class constructor. Additionally, it renames the parameter in rand_port() from 'type' to 'stype' to avoid shadowing the built-in Python name 'type', improving code clarity and preventing potential issues. These changes enhance code readability and maintainability without affecting functionality. Signed-off-by: Breno Leitao <leitao(a)debian.org> --- tools/testing/selftests/net/lib/py/utils.py | 11 +++-------- 1 file changed, 3 insertions(+), 8 deletions(-) diff --git a/tools/testing/selftests/net/lib/py/utils.py b/tools/testing/selftests/net/lib/py/utils.py index b188cac49738f..1cdc8e6d6b603 100644 --- a/tools/testing/selftests/net/lib/py/utils.py +++ b/tools/testing/selftests/net/lib/py/utils.py @@ -1,9 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 -import errno import json as _json import os -import random import re import select import socket @@ -21,8 +19,7 @@ def fd_read_timeout(fd, timeout): rlist, _, _ = select.select([fd], [], [], timeout) if rlist: return os.read(fd, 1024) - else: - raise TimeoutError("Timeout waiting for fd read") + raise TimeoutError("Timeout waiting for fd read") class cmd: @@ -138,8 +135,6 @@ global_defer_queue = [] class defer: def __init__(self, func, *args, **kwargs): - global global_defer_queue - if not callable(func): raise Exception("defer created with un-callable object, did you call the function instead of passing its name?") @@ -227,11 +222,11 @@ def bpftrace(expr, json=None, ns=None, host=None, timeout=None): return cmd_obj -def rand_port(type=socket.SOCK_STREAM): +def rand_port(stype=socket.SOCK_STREAM): """ Get a random unprivileged port. """ - with socket.socket(socket.AF_INET6, type) as s: + with socket.socket(socket.AF_INET6, stype) as s: s.bind(("", 0)) return s.getsockname()[1] --- base-commit: 864ecc4a6dade82d3f70eab43dad0e277aa6fc78 change-id: 20250901-fix-02eb26114040 Best regards, -- Breno Leitao <leitao(a)debian.org>

2 months

3
2
0 0

[PATCH net-next 0/6] mptcp: misc. features for v6.18

by Matthieu Baerts (NGI0)

This series contains 4 independent new features: - Patch 1: use HMAC-SHA256 library instead of open-coded HMAC. - Patches 2-3: make ADD_ADDR retransmission timeout adaptive + simplify selftests. - Patch 4: selftests: check for unexpected fallback counter increments. - Patches 5-6: record subflows in RPS table, for aRFS support. Signed-off-by: Matthieu Baerts (NGI0) <matttbe(a)kernel.org> --- Christoph Paasch (2): net: Add rfs_needed() helper mptcp: record subflows in RPS table Eric Biggers (1): mptcp: use HMAC-SHA256 library instead of open-coded HMAC Gang Yan (1): selftests: mptcp: add checks for fallback counters Geliang Tang (2): mptcp: make ADD_ADDR retransmission timeout adaptive selftests: mptcp: remove add_addr_timeout settings Documentation/networking/mptcp-sysctl.rst | 8 +- include/net/rps.h | 85 ++++++++++------ net/mptcp/crypto.c | 35 +------ net/mptcp/pm.c | 28 +++++- net/mptcp/protocol.c | 21 ++++ tools/testing/selftests/net/mptcp/mptcp_join.sh | 126 +++++++++++++++++++++++- 6 files changed, 231 insertions(+), 72 deletions(-) --- base-commit: d23ad54de795ec0054f90ecb03b41e8f2c410f3a change-id: 20250829-net-next-mptcp-misc-feat-6-18-722fa87a60f1 Best regards, -- Matthieu Baerts (NGI0) <matttbe(a)kernel.org>

2 months

5
18
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[PATCH 0/8] Add selftests for mshare

by Yongting Lin

Mshare is a developing feature proposed by Anthony Yznaga and Khalid Aziz that enables sharing of PTEs across processes. The V3 patch set has been posted for review: https://lore.kernel.org/linux-mm/20250820010415.699353-1-anthony.yznaga@ora… This patch set adds selftests to exercise and demonstrate basic functionality of mshare. The initial tests use open, ioctl, and mmap syscalls to establish a shared memory mapping between two processes and verify the expected behavior. Additional tests are included to check interoperability with swap and Transparent Huge Pages. Future work will extend coverage to other use cases such as integration with KVM and more advanced scenarios. This series is intended to be applied on top of mshare V3, which is based on mm-new (2025-08-15). Yongting Lin (8): mshare: Add selftests mshare: selftests: Adding config fragment mshare: selftests: Add some helper function for mshare filesystem mshare: selftests: Add test case shared memory mshare: selftests: Add test case ioctl unmap mshare: selftests: Add some helper functions for reading and controlling cgroup mshare: selftests: Add test case to demostrate the swaping of mshare memory mshare: selftests: Add test case to demostrate that mshare doesn't support THP tools/testing/selftests/mshare/.gitignore | 3 + tools/testing/selftests/mshare/Makefile | 7 + tools/testing/selftests/mshare/basic.c | 108 ++++++++++ tools/testing/selftests/mshare/config | 1 + tools/testing/selftests/mshare/memory.c | 82 +++++++ tools/testing/selftests/mshare/util.c | 251 ++++++++++++++++++++++ 6 files changed, 452 insertions(+) create mode 100644 tools/testing/selftests/mshare/.gitignore create mode 100644 tools/testing/selftests/mshare/Makefile create mode 100644 tools/testing/selftests/mshare/basic.c create mode 100644 tools/testing/selftests/mshare/config create mode 100644 tools/testing/selftests/mshare/memory.c create mode 100644 tools/testing/selftests/mshare/util.c -- 2.20.1

2 months

2
21
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[PATCH v2 0/2] selftests/mm: split_huge_page_test: split_pte_mapped_thp improvements

by David Hildenbrand

One fix for occasional failures I found while testing and a bunch of cleanups that should make that test easier to digest. Tested on x86-64, the test seems to reliably pass. Cc: Andrew Morton <akpm(a)linux-foundation.org> Cc: Lorenzo Stoakes <lorenzo.stoakes(a)oracle.com> Cc: Zi Yan <ziy(a)nvidia.com> Cc: Baolin Wang <baolin.wang(a)linux.alibaba.com> Cc: "Liam R. Howlett" <Liam.Howlett(a)oracle.com> Cc: Nico Pache <npache(a)redhat.com> Cc: Ryan Roberts <ryan.roberts(a)arm.com> Cc: Dev Jain <dev.jain(a)arm.com> Cc: Barry Song <baohua(a)kernel.org> Cc: Wei Yang <richard.weiyang(a)gmail.com> David Hildenbrand (2): selftests/mm: split_huge_page_test: fix occasional is_backed_by_folio() wrong results selftests/mm: split_huge_page_test: cleanups for split_pte_mapped_thp test .../selftests/mm/split_huge_page_test.c | 138 ++++++++++-------- 1 file changed, 81 insertions(+), 57 deletions(-) base-commit: b73c6f2b5712809f5f386780ac46d1d78c31b2e6 -- 2.50.1

2 months

3
5
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next-20250805: ampere: WARNING: kernel/cgroup/cpuset.c:1352 at remote_partition_disable

by Naresh Kamboju

Regressions noticed intermittently on AmpereOne while running selftest cgroup testing with Linux next-20250805 and earlier seen on next-20250722 tag also. Regression Analysis: - New regression? Yes - Reproducibility? Intermittent First seen on the next-20250722 and after next-20250805. Test regression: next-20250805 ampere WARNING kernel cgroup cpuset.c at remote_partition_disable Reported-by: Linux Kernel Functional Testing <lkft(a)linaro.org> ## Test log selftests: cgroup: test_cpuset_prs.sh Running state tRunning state transition test ... ransition test ... Running test 0 ... Running test 1 ... Running test 2 ... Running test 3 ... Running test 4 ... Running test 5 ... Running test 6 ... Running test 7 ... Running test 8 ... Running test 9 ... Running test 10 ... Running test 11 ... Running test 12 ... Running test 13 ... Running test 14 ... Running test 15 ... Running test 16 ... Running test 17 ... Running test 18 ... Running test 19 ... [ 137.504549] psci: CPU2 killed (polled 0 ms) [ 137.747094] Detected PIPT I-cache on CPU2 [ 137.747214] GICv3: CPU2: found redistributor 3500 region 0:0x0000400201cc0000 [ 137.747312] CPU2: Booted secondary processor 0x0000003500 [0xc00fac40] <> Running test 63 ... Running test 64 ... Running test 66 ... [ 174.929535] psci: CPU3 killed (polled 0 ms) [ 175.263087] Detected PIPT I-cache on CPU3 [ 175.263203] GICv3: CPU3: found redistributor 3501 region 0:0x0000400201d00000 [ 175.263300] CPU3: Booted secondary processor 0x0000003501 [0xc00fac40] [ 175.434129] workqueue: Interrupted when creating a worker thread "kworker/u1028:0" ** replaying previous printk message ** [ 175.434129] workqueue: Interrupted when creating a worker thread "kworker/u1028:0" [ 175.440230] ------------[ cut here ]------------ [ 175.440234] WARNING: kernel/cgroup/cpuset.c:1352 at remote_partition_disable+0x120/0x160, CPU#170: rmdir/33763 [ 175.467456] Modules linked in: cdc_ether usbnet sm3_ce sha3_ce nvme nvme_core xhci_pci_renesas arm_cspmu_module ipmi_devintf arm_spe_pmu ipmi_msghandler arm_cmn cppc_cpufreq fuse drm backlight [ 175.484676] CPU: 170 UID: 0 PID: 33763 Comm: rmdir Not tainted 6.16.0-next-20250805 #1 PREEMPT [ 175.493365] Hardware name: Inspur NF5280R7/Mitchell MB, BIOS 04.04.00004001 2025-02-04 22:23:30 02/04/2025 [ 175.503178] pstate: 63400009 (nZCv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) not ok 12 selftests: cgroup: test_cpuset_prs.sh TIMEOUT 45 seconds [ 175.510130] pc : remote_partition_disable (kernel/cgroup/cpuset.c:1352 (discriminator 1) kernel/cgroup/cpuset.c:1342 (discriminator 1) kernel/cgroup/cpuset.c:1514 (discriminator 1)) [ 175.518032] lr : remote_partition_disable (kernel/cgroup/cpuset.c:1352 (discriminator 1) kernel/cgroup/cpuset.c:1514 (discriminator 1)) [ 175.525849] sp : ffff8000c853bb90 [ 175.529585] x29: ffff8000c853bb90 x28: ffff00017badc800 x27: 0000000000000000 timeout set to 45 [ 175.536713] x26: 0000000000000000 x25: ffff00014c422540 x24: ffffb1c71020b000 [ 175.545489] x23: ffff000113769c00 x22: 0000000000000001 x21: ffffb1c71020b5c0 [ 175.552615] x20: ffff8000c853bbd0 x19: ffff000113769a00 x18: 00000000ffffffff selftests: cgroup: test_cpuset_v1_hp.sh [ 175.559910] x17: 31752f72656b726f x16: 776b222064616572 x15: 68742072656b726f [ 175.569900] x14: 0000000000000004 x13: ffffb1c70fb4f160 x12: 0000000000000000 cpuset v1 mount point not found! [ 175.577888] x11: 000002f6b9bf58c3 x10: 0000000000000023 x9 : ffffb1c70d6bdff8 Test SKIPPED ok 13 selftests: cgroup: test_cpuset_v1_hp.sh #SKIP [ 175.587877] x8 : ffff8000c853bad0 x7 : 0000000000000000 x6 : 0000000000000001 [ 175.597864] x5 : ffffb1c70e87a488 x4 : fffffdffc40a88e0 x3 : 000000000080007d [ 175.607849] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 00000000fffffff4 [ 175.615578] Call trace: [ 175.618013] remote_partition_disable (kernel/cgroup/cpuset.c:1352 (discriminator 1) kernel/cgroup/cpuset.c:1342 (discriminator 1) kernel/cgroup/cpuset.c:1514 (discriminator 1)) (P) [ 175.623057] update_prstate (include/linux/spinlock.h:376 kernel/cgroup/cpuset.c:2963) [ 175.626799] cpuset_css_killed (kernel/cgroup/cpuset.c:3598) [ 175.630713] kill_css.part.0 (kernel/cgroup/cgroup.c:5968) [ 175.634464] cgroup_destroy_locked (kernel/cgroup/cgroup.c:6058 (discriminator 4)) [ 175.638810] cgroup_rmdir (kernel/cgroup/cgroup.c:6102) [ 175.642376] kernfs_iop_rmdir (fs/kernfs/dir.c:1286) [ 175.646203] vfs_rmdir (fs/namei.c:4461 fs/namei.c:4438) [ 175.649515] do_rmdir (fs/namei.c:4516 (discriminator 1)) [ 175.652823] __arm64_sys_unlinkat (fs/namei.c:4690 (discriminator 2) fs/namei.c:4684 (discriminator 2) fs/namei.c:4684 (discriminator 2)) [ 175.656998] invoke_syscall (arch/arm64/include/asm/current.h:19 arch/arm64/kernel/syscall.c:54) [ 175.660738] el0_svc_common.constprop.0 (include/linux/thread_info.h:135 (discriminator 2) arch/arm64/kernel/syscall.c:140 (discriminator 2)) [ 175.665431] do_el0_svc (arch/arm64/kernel/syscall.c:152) [ 175.668735] el0_svc (arch/arm64/include/asm/irqflags.h:82 (discriminator 1) arch/arm64/include/asm/irqflags.h:123 (discriminator 1) arch/arm64/include/asm/irqflags.h:136 (discriminator 1) arch/arm64/kernel/entry-common.c:169 (discriminator 1) arch/arm64/kernel/entry-common.c:182 (discriminator 1) arch/arm64/kernel/entry-common.c:880 (discriminator 1)) [ 175.671877] el0t_64_sync_handler (arch/arm64/kernel/entry-common.c:899) [ 175.676052] el0t_64_sync (arch/arm64/kernel/entry.S:596) [ 175.679705] ---[ end trace 0000000000000000 ]--- ## Source * Git tree: https://kernel.googlesource.com/pub/scm/linux/kernel/git/next/linux-next.git * Git sha: afec768a6a8fe7fb02a08ffce5f2f556f51d4b52 * Git describe: next-20250805 * Architectures: arm64 * Toolchains: gcc-13 * Kconfigs: defconfig+selftests/*/configs ## Build * Test log 1: https://qa-reports.linaro.org/api/testruns/29220998/log_file/ * Test log 2: https://qa-reports.linaro.org/api/testruns/29395866/log_file/ * LAVA log: https://lkft-staging.validation.linaro.org/scheduler/job/187100#L6621 * Test history: https://regressions.linaro.org/lkft/linux-next-master-ampere/next-20250805/… * Test plan: https://tuxapi.tuxsuite.com/v1/groups/ampere/projects/ci/tests/30rj0dIdTXUi… * Build link: https://storage.tuxsuite.com/public/ampere/ci/builds/30rj0OYSDUMeT0cyTDioTe… * Kernel config: https://storage.tuxsuite.com/public/ampere/ci/builds/30rj0OYSDUMeT0cyTDioTe… -- Linaro LKFT https://lkft.linaro.org

2 months

3
4
0 0

[PATCH v3 1/2] libbpf: add support for printing BTF character arrays as strings

by Blake Jones

The BTF dumper code currently displays arrays of characters as just that - arrays, with each character formatted individually. Sometimes this is what makes sense, but it's nice to be able to treat that array as a string. This change adds a special case to the btf_dump functionality to allow 0-terminated arrays of single-byte integer values to be printed as character strings. Characters for which isprint() returns false are printed as hex-escaped values. This is enabled when the new ".emit_strings" is set to 1 in the btf_dump_type_data_opts structure. As an example, here's what it looks like to dump the string "hello" using a few different field values for btf_dump_type_data_opts (.compact = 1): - .emit_strings = 0, .skip_names = 0: (char[6])['h','e','l','l','o',] - .emit_strings = 0, .skip_names = 1: ['h','e','l','l','o',] - .emit_strings = 1, .skip_names = 0: (char[6])"hello" - .emit_strings = 1, .skip_names = 1: "hello" Here's the string "h\xff", dumped with .compact = 1 and .skip_names = 1: - .emit_strings = 0: ['h',-1,] - .emit_strings = 1: "h\xff" Signed-off-by: Blake Jones <blakejones(a)google.com> --- tools/lib/bpf/btf.h | 3 ++- tools/lib/bpf/btf_dump.c | 55 +++++++++++++++++++++++++++++++++++++++- 2 files changed, 56 insertions(+), 2 deletions(-) diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h index 4392451d634b..ccfd905f03df 100644 --- a/tools/lib/bpf/btf.h +++ b/tools/lib/bpf/btf.h @@ -326,9 +326,10 @@ struct btf_dump_type_data_opts { bool compact; /* no newlines/indentation */ bool skip_names; /* skip member/type names */ bool emit_zeroes; /* show 0-valued fields */ + bool emit_strings; /* print char arrays as strings */ size_t :0; }; -#define btf_dump_type_data_opts__last_field emit_zeroes +#define btf_dump_type_data_opts__last_field emit_strings LIBBPF_API int btf_dump__dump_type_data(struct btf_dump *d, __u32 id, diff --git a/tools/lib/bpf/btf_dump.c b/tools/lib/bpf/btf_dump.c index 460c3e57fadb..7c2f1f13f958 100644 --- a/tools/lib/bpf/btf_dump.c +++ b/tools/lib/bpf/btf_dump.c @@ -68,6 +68,7 @@ struct btf_dump_data { bool compact; bool skip_names; bool emit_zeroes; + bool emit_strings; __u8 indent_lvl; /* base indent level */ char indent_str[BTF_DATA_INDENT_STR_LEN]; /* below are used during iteration */ @@ -2028,6 +2029,52 @@ static int btf_dump_var_data(struct btf_dump *d, return btf_dump_dump_type_data(d, NULL, t, type_id, data, 0, 0); } +static int btf_dump_string_data(struct btf_dump *d, + const struct btf_type *t, + __u32 id, + const void *data) +{ + const struct btf_array *array = btf_array(t); + const char *chars = data; + __u32 i; + + /* Make sure it is a NUL-terminated string. */ + for (i = 0; i < array->nelems; i++) { + if ((void *)(chars + i) >= d->typed_dump->data_end) + return -E2BIG; + if (chars[i] == '\0') + break; + } + if (i == array->nelems) { + /* The caller will print this as a regular array. */ + return -EINVAL; + } + + btf_dump_data_pfx(d); + btf_dump_printf(d, "\""); + + for (i = 0; i < array->nelems; i++) { + char c = chars[i]; + + if (c == '\0') { + /* + * When printing character arrays as strings, NUL bytes + * are always treated as string terminators; they are + * never printed. + */ + break; + } + if (isprint(c)) + btf_dump_printf(d, "%c", c); + else + btf_dump_printf(d, "\\x%02x", (__u8)c); + } + + btf_dump_printf(d, "\""); + + return 0; +} + static int btf_dump_array_data(struct btf_dump *d, const struct btf_type *t, __u32 id, @@ -2055,8 +2102,13 @@ static int btf_dump_array_data(struct btf_dump *d, * char arrays, so if size is 1 and element is * printable as a char, we'll do that. */ - if (elem_size == 1) + if (elem_size == 1) { + if (d->typed_dump->emit_strings && + btf_dump_string_data(d, t, id, data) == 0) { + return 0; + } d->typed_dump->is_array_char = true; + } } /* note that we increment depth before calling btf_dump_print() below; @@ -2544,6 +2596,7 @@ int btf_dump__dump_type_data(struct btf_dump *d, __u32 id, d->typed_dump->compact = OPTS_GET(opts, compact, false); d->typed_dump->skip_names = OPTS_GET(opts, skip_names, false); d->typed_dump->emit_zeroes = OPTS_GET(opts, emit_zeroes, false); + d->typed_dump->emit_strings = OPTS_GET(opts, emit_strings, false); ret = btf_dump_dump_type_data(d, NULL, t, id, data, 0, 0); -- 2.49.0.1204.g71687c7c1d-goog

2 months

7
12
0 0

[PATCH v2 7/7] selftests: kselftest: Add ulong typedef for non-glibc compatibility

by Aqib Faruqui

Some C libraries may not define the ulong typedef that is commonly available as a BSD/GNU extension. Add a fallback typedef to ensure ulong is available across all selftest environments. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- tools/testing/selftests/kselftest.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/tools/testing/selftests/kselftest.h b/tools/testing/selftests/kselftest.h index f362c6766..a1088a2af 100644 --- a/tools/testing/selftests/kselftest.h +++ b/tools/testing/selftests/kselftest.h @@ -58,6 +58,11 @@ #include <stdio.h> #include <sys/utsname.h> #include <sys/syscall.h> +#include <sys/types.h> +#endif + +#ifndef ulong +typedef unsigned long ulong; #endif #ifndef ARRAY_SIZE -- 2.47.3

2 months

1
0
0 0

[PATCH v2 6/7] selftests: Fix stdbuf compatibility in mixed libc environments

by Aqib Faruqui

The original stdbuf use only checked if /usr/bin/stdbuf exists in the host's system but failed to verify compatibility between stdbuf and the target test binary. The issue occurs when: - Host system has glibc-based stdbuf from coreutils - Selftest binaries are compiled with a non-glibc toolchain (cross compilation) The fix adds a runtime compatibility test against the target test binary before enabling stdbuf, enabling cross-compiled selftests to run successfully. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- tools/testing/selftests/kselftest/runner.sh | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/tools/testing/selftests/kselftest/runner.sh b/tools/testing/selftests/kselftest/runner.sh index 2c3c58e65..8d4e33bd5 100644 --- a/tools/testing/selftests/kselftest/runner.sh +++ b/tools/testing/selftests/kselftest/runner.sh @@ -107,7 +107,7 @@ run_one() echo "# Warning: file $TEST is missing!" echo "not ok $test_num $TEST_HDR_MSG" else - if [ -x /usr/bin/stdbuf ]; then + if [ -x /usr/bin/stdbuf ] && [ -x "$TEST" ] && /usr/bin/stdbuf --output=L ldd "$TEST" >/dev/null 2>&1; then stdbuf="/usr/bin/stdbuf --output=L " fi eval kselftest_cmd_args="\$${kselftest_cmd_args_ref:-}" -- 2.47.3

2 months

1
0
0 0

[PATCH v2 5/7] rseq: selftests: Add non-glibc compatibility fixes

by Aqib Faruqui

The rseq selftests rely on features provided by glibc that may not be available in non-glibc C libraries: 1. The __GNU_PREREQ macro and glibc's thread pointer implementation are not available in non-glibc libraries 2. The __NR_rseq syscall number may not be defined in non-glibc headers Add a fallback thread pointer implementation for non-glibc systems using the pre-existing inline assembly to access thread-local storage directly via %fs/%gs registers. Also provide a fallback definition for __NR_rseq when not already defined by the C library headers: 527 for alpha and 293 for other architectures. Signed-off-by: Aqib Faruqui <aqibaf(a)amazon.com> --- .../selftests/rseq/rseq-x86-thread-pointer.h | 14 ++++++++++++++ tools/testing/selftests/rseq/rseq.c | 8 ++++++++ 2 files changed, 22 insertions(+) diff --git a/tools/testing/selftests/rseq/rseq-x86-thread-pointer.h b/tools/testing/selftests/rseq/rseq-x86-thread-pointer.h index d3133587d..a7c402926 100644 --- a/tools/testing/selftests/rseq/rseq-x86-thread-pointer.h +++ b/tools/testing/selftests/rseq/rseq-x86-thread-pointer.h @@ -14,6 +14,7 @@ extern "C" { #endif +#ifdef __GLIBC__ #if __GNUC_PREREQ (11, 1) static inline void *rseq_thread_pointer(void) { @@ -32,6 +33,19 @@ static inline void *rseq_thread_pointer(void) return __result; } #endif /* !GCC 11 */ +#else +static inline void *rseq_thread_pointer(void) +{ + void *__result; + +# ifdef __x86_64__ + __asm__ ("mov %%fs:0, %0" : "=r" (__result)); +# else + __asm__ ("mov %%gs:0, %0" : "=r" (__result)); +# endif + return __result; +} +#endif /* !__GLIBC__ */ #ifdef __cplusplus } diff --git a/tools/testing/selftests/rseq/rseq.c b/tools/testing/selftests/rseq/rseq.c index 663a9cef1..1a6f73c98 100644 --- a/tools/testing/selftests/rseq/rseq.c +++ b/tools/testing/selftests/rseq/rseq.c @@ -36,6 +36,14 @@ #include "../kselftest.h" #include "rseq.h" +#ifndef __NR_rseq +#ifdef __alpha__ +#define __NR_rseq 527 +#else +#define __NR_rseq 293 +#endif +#endif + /* * Define weak versions to play nice with binaries that are statically linked * against a libc that doesn't support registering its own rseq. -- 2.47.3

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