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2026-03-30rcuscale: Ditch rcu_scale_shutdown in favor of torture_shutdown_init()Paul E. McKenney
The torture_shutdown_init() function spawns a shutdown kthread in a manner very similar to that implemented by rcu_scale_shutdown(). This commit therefore re-implements rcu_scale_shutdown() in terms of torture_shutdown_init(). This patch was generated by Claude given as input the patch making the same transformation of ref_scale_shutdown(). Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30refscale: Ditch ref_scale_shutdown in favor of torture_shutdown_init()Paul E. McKenney
The torture_shutdown_init() function spawns a shutdown kthread in a manner very similar to that implemented by ref_scale_shutdown(). This commit therefore re-implements ref_scale_shutdown in terms of torture_shutdown_init(). The initial draft of this patch was generated by version 2.1.16 of the Claude AI/LLM, but trained and configured for use by my employer, and prompted to refer to Linux-kernel source code. This initial draft failed to provide a forward reference to ref_scale_cleanup(), passed zero to torture_shutdown_init() for an unwelcome insta-shutdown, and failed to pass the kvm.sh --duration argument in as a refscale module parameter. On the other hand, it did catch the need to NULL main_task on the post-test self-shutdown code path, which I might well have forgotten to do. This version of the patch fixes those problems, and in fact very little of the initial draft remains. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30rcutorture: Fix numeric "test" comparison in srcu_lockdep.shPaul E. McKenney
This commit switches from "-eq" to "=" to handle the non-numeric comparisons in srcu_lockdep.sh. While in the area, adjust SRCU flavor to improve coverage. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30torture: Print informative message for test without recheck filePaul E. McKenney
If a type of torture test lacks a recheck file, a bash diagnostic is printed, which looks like a torture-test bug. This commit gets rid of this false positive by explicitly checking for the file, invoking it if it exists, otherwise printing an informative non-diagnostic message. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30torture: Make hangs more visible in torture.sh outputPaul E. McKenney
This commit labels "QEMU killed" lines so that they will be picked up by torture.sh processing. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30kvm-check-branches.sh: Remove in favor of kvm-series.shPaul E. McKenney
The kvm-series.sh script is an order-of-magnitude optimization of kvm-check-branches.sh, so remove the old script. Signed-off-by: Paul E. McKenney <paulmck@kernel.org> Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30rcutorture: Add a textbook-style trivial preemptible RCUPaul E. McKenney
This commit adds a trivial textbook implementation of preemptible RCU to rcutorture ("torture_type=trivial-preempt"), similar in spirit to the existing "torture_type=trivial" textbook implementation of non-preemptible RCU. Neither trivial RCU implementation has any value for production use, and are intended only to keep Paul honest in his introductory writings and presentations. [ paulmck: Apply kernel test robot feedback. ] Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
2026-03-30Merge branch 'for-7.0-fixes' into for-7.1Tejun Heo
Conflict in kernel/sched/ext.c init_sched_ext_class() between: 415cb193bb97 ("sched_ext: Fix SCX_KICK_WAIT deadlock by deferring wait to balance callback") which adds cpus_to_sync cpumask allocation, and: 84b1a0ea0b7c ("sched_ext: Implement scx_bpf_dsq_reenq() for user DSQs") 8c1b9453fde6 ("sched_ext: Convert deferred_reenq_locals from llist to regular list") which add deferred_reenq init code at the same location. Both are independent additions. Include both. Signed-off-by: Tejun Heo <tj@kernel.org>
2026-03-30selftests/sched_ext: Add cyclic SCX_KICK_WAIT stress testTejun Heo
Add a test that creates a 3-CPU kick_wait cycle (A->B->C->A). A BPF scheduler kicks the next CPU in the ring with SCX_KICK_WAIT on every enqueue while userspace workers generate continuous scheduling churn via sched_yield(). Without the preceding fix, this hangs the machine within seconds. Signed-off-by: Tejun Heo <tj@kernel.org> Reviewed-by: Christian Loehle <christian.loehle@arm.com> Tested-by: Christian Loehle <christian.loehle@arm.com>
2026-03-30Merge branch 'master' into rdma-nextLeon Romanovsky
Let's bring v7.0-rc6 to the -next branch, so we can merge the DMA attributes fix [1] without merge conflicts. [1] https://lore.kernel.org/all/20260323-umem-dma-attrs-v1-1-d6890f2e6a1e@nvidia.com Signed-off-by: Leon Romanovsky <leon@kernel.org> * master: (1688 commits) Linux 7.0-rc6 ...
2026-03-30RDMA/rxe: Add testcase for net namespace rxeZhu Yanjun
Add 4 testcases for rxe with net namespace. Reviewed-by: David Ahern <dsahern@kernel.org> Signed-off-by: Zhu Yanjun <yanjun.zhu@linux.dev> Link: https://patch.msgid.link/20260313023058.13020-5-yanjun.zhu@linux.dev Signed-off-by: Leon Romanovsky <leon@kernel.org>
2026-03-30docs: kdoc_diff: add a helper tool to help checking kdoc regressionsMauro Carvalho Chehab
Checking for regressions at kernel-doc can be hard. Add a helper tool to make such task easier. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <24b3116a78348b13a74d1ff5e141160ef9705dd3.1774551940.git.mchehab+huawei@kernel.org>
2026-03-30tools: unittest_helper: add a quiet modeMauro Carvalho Chehab
On quiet mode, only report errors. Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <27556792ff70e6267ecd19c258149d380db8d423.1774551940.git.mchehab+huawei@kernel.org>
2026-03-30rtla: Fix build without libbpf headerTomas Glozar
rtla supports building without libbpf. However, BPF actions patchset [1] adds an include of bpf/libbpf.h into timerlat_bpf.h, which breaks build on systems that don't have libbpf headers installed. This is a leftover from a draft version of the patchset where timerlat_bpf_set_action() (which takes a struct bpf_program * argument) was defined in the header. timerlat_bpf.c already includes bpf/libbpf.h via timerlat.skel.h when libbpf is present. Remove the redundant include to fix build on systems without libbpf headers. [1] https://lore.kernel.org/linux-trace-kernel/20251126144205.331954-1-tglozar@redhat.com/T/ Cc: John Kacur <jkacur@redhat.com> Cc: Luis Goncalves <lgoncalv@redhat.com> Cc: Crystal Wood <crwood@redhat.com> Cc: Costa Shulyupin <costa.shul@redhat.com> Link: https://patch.msgid.link/20260330091207.16184-1-tglozar@redhat.com Reported-by: Steven Rostedt (Google) <rostedt@goodmis.org> Closes: https://lore.kernel.org/linux-trace-kernel/20260329122202.65a8b575@robin/ Fixes: 8cd0f08ac72e ("rtla/timerlat: Support tail call from BPF program") Signed-off-by: Tomas Glozar <tglozar@redhat.com> Reviewed-by: Wander Lairson Costa <wander@redhat.com> Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
2026-03-30doc tools: better handle KBUILD_VERBOSEMauro Carvalho Chehab
As reported by Jacob, there are troubles when KBUILD_VERBOSE is set at the environment. Fix it on both kernel-doc and sphinx-build-wrapper. Reported-by: Jacob Keller <jacob.e.keller@intel.com> Closes: https://lore.kernel.org/linux-doc/9367d899-53af-4d9c-9320-22fc4dbadca5@intel.com/ Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org> Tested-by: Jacob Keller <jacob.e.keller@intel.com> Signed-off-by: Jonathan Corbet <corbet@lwn.net> Message-ID: <7a99788db75630fb14828d612c0fd77c45ec1891.1774591065.git.mchehab+huawei@kernel.org>
2026-03-30selftests/livepatch: add test for module function patchingPablo Alessandro Santos Hugen
Add a target module and livepatch pair that verify module function patching via a proc entry. Two test cases cover both the klp_enable_patch path (target loaded before livepatch) and the klp_module_coming path (livepatch loaded before target). Signed-off-by: Pablo Alessandro Santos Hugen <phugen@redhat.com> Acked-by: Miroslav Benes <mbenes@suse.cz> Acked-by: Joe Lawrence <joe.lawrence@redhat.com> Reviewed-by: Petr Mladek <pmladek@suse.com> Tested-by: Petr Mladek <pmladek@suse.com> Link: https://patch.msgid.link/20260320201135.1203992-1-phugen@redhat.com Signed-off-by: Petr Mladek <pmladek@suse.com>
2026-03-29Merge tag 'vfs-7.0-rc6.fixes' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs Pull vfs fixes from Christian Brauner: - Fix netfs_limit_iter() hitting BUG() when an ITER_KVEC iterator reaches it via core dump writes to 9P filesystems. Add ITER_KVEC handling following the same pattern as the existing ITER_BVEC code. - Fix a NULL pointer dereference in the netfs unbuffered write retry path when the filesystem (e.g., 9P) doesn't set the prepare_write operation. - Clear I_DIRTY_TIME in sync_lazytime for filesystems implementing ->sync_lazytime. Without this the flag stays set and may cause additional unnecessary calls during inode deactivation. - Increase tmpfs size in mount_setattr selftests. A recent commit bumped the ext4 image size to 2 GB but didn't adjust the tmpfs backing store, so mkfs.ext4 fails with ENOSPC writing metadata. - Fix an invalid folio access in iomap when i_blkbits matches the folio size but differs from the I/O granularity. The cur_folio pointer would not get invalidated and iomap_read_end() would still be called on it despite the IO helper owning it. - Fix hash_name() docstring. - Fix read abandonment during netfs retry where the subreq variable used for abandonment could be uninitialized on the first pass or point to a deleted subrequest on later passes. - Don't block sync for filesystems with no data integrity guarantees. Add a SB_I_NO_DATA_INTEGRITY superblock flag replacing the per-inode AS_NO_DATA_INTEGRITY mapping flag so sync kicks off writeback but doesn't wait for flusher threads. This fixes a suspend-to-RAM hang on fuse-overlayfs where the flusher thread blocks when the fuse daemon is frozen. - Fix a lockdep splat in iomap when reads fail. iomap_read_end_io() invokes fserror_report() which calls igrab() taking i_lock in hardirq context while i_lock is normally held with interrupts enabled. Kick failed read handling to a workqueue. - Remove the redundant netfs_io_stream::front member and use stream->subrequests.next instead, fixing a potential issue in the direct write code path. * tag 'vfs-7.0-rc6.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: netfs: Fix the handling of stream->front by removing it iomap: fix lockdep complaint when reads fail writeback: don't block sync for filesystems with no data integrity guarantees netfs: Fix read abandonment during retry vfs: fix docstring of hash_name() iomap: fix invalid folio access when i_blkbits differs from I/O granularity selftests/mount_setattr: increase tmpfs size for idmapped mount tests fs: clear I_DIRTY_TIME in sync_lazytime netfs: Fix NULL pointer dereference in netfs_unbuffered_write() on retry netfs: Fix kernel BUG in netfs_limit_iter() for ITER_KVEC iterators
2026-03-29selftests: drv-net: xdp: Add rss_hash metadata testsChris J Arges
This test loads xdp_metadata.bpf which calls bpf_xdp_metadata_rx_hash() on incoming packets. The metadata from that packet is then sent to a BPF map for validation. It borrows structure from xdp.py, reusing common functions. The test checks the device's xdp-rx-metadata-features via netlink before running and skips on devices that do not advertise hash support. This can be run on veth devices as well as real hardware. The test is fairly simple and just verifies that a TCP or UDP packet can be identified as an L4 flow. This minimal test also passes if run on a veth device. Signed-off-by: Chris J Arges <carges@cloudflare.com> Link: https://patch.msgid.link/20260325201139.2501937-7-carges@cloudflare.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-03-29selftests: net: move common xdp.py functions into libChris J Arges
This moves a few functions which can be useful to other python programs that manipulate XDP programs. This also refactors xdp.py to use the refactored functions. Signed-off-by: Chris J Arges <carges@cloudflare.com> Link: https://patch.msgid.link/20260325201139.2501937-6-carges@cloudflare.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-03-29selftests/bpf: Add few tests for alu32 shift value tracking and zextDaniel Borkmann
Add few more alu32 shift tests using div-by-zero on provably dead paths to check both verifier and JIT xlation resp. runtime correctness. If the verifier mistracks the result, it rejects due to the div by 0; if the JIT computes a wrong value, then runtime hits the dead path and retval changes. # LDLIBS=-static PKG_CONFIG='pkg-config --static' ./vmtest.sh -- ./test_progs -t verifier_subreg [...] #644/76 verifier_subreg/arsh32_imm1_value:OK #644/77 verifier_subreg/lsh32_reg0_zero_extend_check:OK #644/78 verifier_subreg/rsh32_reg0_zero_extend_check:OK #644/79 verifier_subreg/arsh32_reg0_zero_extend_check:OK #644/80 verifier_subreg/lsh32_imm31_value:OK #644/81 verifier_subreg/rsh32_imm31_value:OK #644/82 verifier_subreg/arsh32_imm31_value:OK #644/83 verifier_subreg/lsh32_unknown_precise_bounds:OK #644/84 verifier_subreg/rsh32_unknown_bounds:OK #644 verifier_subreg:OK Summary: 1/84 PASSED, 0 SKIPPED, 0 FAILED Signed-off-by: Daniel Borkmann <daniel@iogearbox.net> Link: https://lore.kernel.org/r/20260327220629.343327-1-daniel@iogearbox.net Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-03-29selftests/bpf: Update kfuncs using btf_struct_meta to new variantsIhor Solodrai
Update selftests to use the new non-_impl kfuncs marked with KF_IMPLICIT_ARGS by removing redundant declarations and macros from bpf_experimental.h (the new kfuncs are present in the vmlinux.h) and updating relevant callsites. Fix spin_lock verifier-log matching for lock_id_kptr_preserve by accepting variable instruction numbers. The calls to kfuncs with implicit arguments do not have register moves (e.g. r5 = 0) corresponding to dummy arguments anymore, so the order of instructions has shifted. Acked-by: Mykyta Yatsenko <yatsenko@meta.com> Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20260327203241.3365046-2-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-03-29bpf: Support struct btf_struct_meta via KF_IMPLICIT_ARGSIhor Solodrai
The following kfuncs currently accept void *meta__ign argument: * bpf_obj_new_impl * bpf_obj_drop_impl * bpf_percpu_obj_new_impl * bpf_percpu_obj_drop_impl * bpf_refcount_acquire_impl * bpf_list_push_back_impl * bpf_list_push_front_impl * bpf_rbtree_add_impl The __ign suffix is an indicator for the verifier to skip the argument in check_kfunc_args(). Then, in fixup_kfunc_call() the verifier may set the value of this argument to struct btf_struct_meta * kptr_struct_meta from insn_aux_data. BPF programs must pass a dummy NULL value when calling these kfuncs. Additionally, the list and rbtree _impl kfuncs also accept an implicit u64 argument, which doesn't require __ign suffix because it's a scalar, and BPF programs explicitly pass 0. Add new kfuncs with KF_IMPLICIT_ARGS [1], that correspond to each _impl kfunc accepting meta__ign. The existing _impl kfuncs remain unchanged for backwards compatibility. To support this, add "btf_struct_meta" to the list of recognized implicit argument types in resolve_btfids. Implement is_kfunc_arg_implicit() in the verifier, that determines implicit args by inspecting both a non-_impl BTF prototype of the kfunc. Update the special_kfunc_list in the verifier and relevant checks to support both the old _impl and the new KF_IMPLICIT_ARGS variants of btf_struct_meta users. [1] https://lore.kernel.org/bpf/20260120222638.3976562-1-ihor.solodrai@linux.dev/ Signed-off-by: Ihor Solodrai <ihor.solodrai@linux.dev> Acked-by: Jiri Olsa <jolsa@kernel.org> Link: https://lore.kernel.org/r/20260327203241.3365046-1-ihor.solodrai@linux.dev Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-03-28tools/x86/kcpuid: Update bitfields to x86-cpuid-db v3.0Ahmed S. Darwish
Update kcpuid's CSV to version 3.0, as generated by x86-cpuid-db. Summary of the v2.5 changes: - Reduce the verbosity of leaf and bitfields descriptions, as formerly requested by Boris. - Leaf 0x8000000a: Add Page Modification Logging (PML) bit. Summary of the v3.0 changes: - Leaf 0x23: Introduce subleaf 2, Auto Counter Reload (ACR) - Leaf 0x23: Introduce subleaf 4/5, PEBS capabilities and counters - Leaf 0x1c: Return LBR depth as a bitmask instead of individual bits - Leaf 0x0a: Use more descriptive PMU bitfield names - Leaf 0x0a: Add various missing PMU events - Leaf 0x06: Add missing IA32_HWP_CTL flag - Leaf 0x0f: Add missing non-CPU (IO) Intel RDT bits Thanks to Dave Hansen for reporting multiple missing bits. Signed-off-by: Ahmed S. Darwish <darwi@linutronix.de> Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de> Link: https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/v2.5/CHANGELOG.rst Link: https://gitlab.com/x86-cpuid.org/x86-cpuid-db/-/blob/v3.0/CHANGELOG.rst
2026-03-27selftests: fix ARCH normalization to handle command-line argumentAleksei Oladko
Several selftests Makefiles (e.g. prctl, breakpoints, etc) attempt to normalize the ARCH variable by converting x86_64 and i.86 to x86. However, it uses the conditional assignment operator '?='. When ARCH is passed as a command-line argument (e.g., during an rpmbuild process), the '?=' operator ignores the shell command and the sed transformation. This leads to an incorrect ARCH value being used, which causes build failures # make -C tools/testing/selftests TARGETS=prctl ARCH=x86_64 make: Entering directory '/build/tools/testing/selftests' make[1]: Entering directory '/build/tools/testing/selftests/prctl' make[1]: *** No targets. Stop. make[1]: Leaving directory '/build/tools/testing/selftests/prctl' make: *** [Makefile:197: all] Error 2 Change the assignment to use 'override' and ':=' to ensure the normalization logic is applied regardless of how the ARCH variable was initially defined. Link: https://lkml.kernel.org/r/20260309205145.572778-1-aleksey.oladko@virtuozzo.com Signed-off-by: Aleksei Oladko <aleksey.oladko@virtuozzo.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Wei Yang <richard.weiyang@gmail.com> Cc: Bala-Vignesh-Reddy <reddybalavignesh9979@gmail.com> Cc: Chelsy Ratnawat <chelsyratnawat2001@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27tools/getdelays: use the static UAPI headers from tools/include/uapiThomas Weißschuh
The include directory ../../usr/include is only present if an in-tree kernel build with CONFIG_HEADERS_INSTALL was done before. Otherwise the system UAPI headers are used, which most likely are not the most recent ones. To make sure to always have access to up-to-date UAPI headers, use the static copy in tools/include/uapi. Link: https://lkml.kernel.org/r/20260307-accounting-taskstats-h-v1-2-0b75915c6ce5@weissschuh.net Reported-by: kernel test robot <lkp@intel.com> Closes: https://lore.kernel.org/r/202603062103.Z5fecwZD-lkp@intel.com/ Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Jiang Kun <jiang.kun2@zte.com.cn> Cc: Wang Yaxin <wang.yaxin@zte.com.cn> Cc: xu xin <xu.xin16@zte.com.cn> Cc: Yang Yang <yang.yang29@zte.com.cn> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27tools headers UAPI: sync linux/taskstats.hThomas Weißschuh
Patch series "tools/getdelays: use the static UAPI headers from tools/include/uapi". The include directory ../../usr/include is only present if an in-tree kernel build with CONFIG_HEADERS_INSTALL was done before. Otherwise the system UAPI headers are used, which most likely are not the most recent ones. To make sure to always have access to up-to-date UAPI headers, use the static copy in tools/include/uapi. This patch (of 2): To give the accounting tools access to the new fields introduced in commit 503efe850c74 ("delayacct: add timestamp of delay max") Link: https://lkml.kernel.org/r/20260307-accounting-taskstats-h-v1-0-0b75915c6ce5@weissschuh.net Link: https://lkml.kernel.org/r/20260307-accounting-taskstats-h-v1-1-0b75915c6ce5@weissschuh.net Signed-off-by: Thomas Weißschuh <linux@weissschuh.net> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Balbir Singh <bsingharora@gmail.com> Cc: Jiang Kun <jiang.kun2@zte.com.cn> Cc: Wang Yaxin <wang.yaxin@zte.com.cn> Cc: xu xin <xu.xin16@zte.com.cn> Cc: Yang Yang <yang.yang29@zte.com.cn> Cc: kernel test robot <lkp@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27selftests/fchmodat2: use ksft_finished()Mark Brown
The fchmodat2 test program open codes a version of ksft_finished(), use the standard version. Link: https://lkml.kernel.org/r/20260226-selftests-fchmodat2-v4-2-a6419435f2e8@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org> Acked-by: Alexey Gladkov <legion@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27selftests/fchmodat2: clean up temporary files and directoriesMark Brown
Patch series "selftests/fchmodat2: Error handling and general", v4. I looked at the fchmodat2() tests since I've been experiencing some random intermittent segfaults with them in my test systems, while doing so I noticed these two issues. Unfortunately I didn't figure out the original yet, unless I managed to fix it unwittingly. This patch (of 2): The fchmodat2() test program creates a temporary directory with a file and a symlink for every test it runs but never cleans these up, resulting in ${TMPDIR} getting left with stale files after every run. Restructure the program a bit to ensure that we clean these up, this is more invasive than it might otherwise be due to the extensive use of ksft_exit_fail_msg() in the program. As a side effect this also ensures that we report a consistent test name for the tests and always try both tests even if they are skipped. Link: https://lkml.kernel.org/r/20260226-selftests-fchmodat2-v4-0-a6419435f2e8@kernel.org Link: https://lkml.kernel.org/r/20260226-selftests-fchmodat2-v4-1-a6419435f2e8@kernel.org Signed-off-by: Mark Brown <broonie@kernel.org> Acked-by: Alexey Gladkov <legion@kernel.org> Cc: Christian Brauner <brauner@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27selftests/ipc: skip msgque test when MSG_COPY is unsupportedUYeol Jo
msgque kselftest uses msgrcv(..., MSG_COPY) to copy messages. When the kernel is built without CONFIG_CHECKPOINT_RESTORE, prepare_copy() is stubbed out and msgrcv() returns -ENOSYS. The test currently reports this as a failure even though it is simply a missing feature/configuration. Skip the test when msgrcv() fails with ENOSYS. Link: https://lkml.kernel.org/r/20260210135359.178636-1-jouyeol8739@gmail.com Signed-off-by: UYeol Jo <jouyeol8739@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Wei Yang <richard.weiyang@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
2026-03-27selftests/tc-testing: add test for HFSC divide-by-zero in rtsc_min()Xiang Mei
Add a regression test for the divide-by-zero in rtsc_min() triggered when m2sm() converts a large m1 value (e.g. 32gbit) to a u64 scaled slope reaching 2^32. rtsc_min() stores the difference of two such u64 values (sm1 - sm2) in a u32 variable `dsm`, truncating 2^32 to zero and causing a divide-by-zero oops in the concave-curve intersection path. The test configures an HFSC class with m1=32gbit d=1ms m2=0bit, sends a packet to activate the class, waits for it to drain and go idle, then sends another packet to trigger reactivation through rtsc_min(). Signed-off-by: Xiang Mei <xmei5@asu.edu> Acked-by: Jamal Hadi Salim <jhs@mojatatu.com> Reviewed-by: Victor Nogueira <victor@mojatatu.com> Link: https://patch.msgid.link/20260326204310.1549327-2-xmei5@asu.edu Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-03-27perf tools: Add --pmu-filter option for filtering PMUsQinxin Xia
This patch adds a new --pmu-filter option to perf-stat command to allow filtering events on specific PMUs. This is useful when there are multiple PMUs with same type (e.g. hisi_sicl2_cpa0 and hisi_sicl0_cpa0). [root@localhost tmp]# 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 [root@localhost tmp]# 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 Signed-off-by: Qinxin Xia <xiaqinxin@huawei.com> Reviewed-by: Ian Rogers <irogers@google.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-03-27cxl/core/region: move dax region device logic into region_dax.cGregory Price
core/region.c is overloaded with per-region control logic (pmem, dax, sysram, etc). Move the CXL DAX region device infrastructure from region.c into a new region_dax.c file. This will also allow us to add additional dax-driver integration paths that don't further dirty the core region.c logic. No functional changes. Signed-off-by: Gregory Price <gourry@gourry.net> Co-developed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Link: https://patch.msgid.link/20260327020203.876122-3-gourry@gourry.net Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-03-27cxl/core/region: move pmem region driver logic into region_pmem.cGregory Price
core/region.c is overloaded with per-region control logic (pmem, dax, sysram, etc). Move the pmem region driver logic from region.c into region_pmem.c make it clear that this code only applies to pmem regions. No functional changes. [ dj: Fixed up some tabbing issues, may be from original code. ] Signed-off-by: Gregory Price <gourry@gourry.net> Co-developed-by: Ira Weiny <ira.weiny@intel.com> Signed-off-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Reviewed-by: Alison Schofield <alison.schofield@intel.com> Link: https://patch.msgid.link/20260327020203.876122-2-gourry@gourry.net Signed-off-by: Dave Jiang <dave.jiang@intel.com>
2026-03-27scx_central: Defer timer start to central dispatch to fix init errorZhao Mengmeng
scx_central currently assumes that ops.init() runs on the selected central CPU and aborts otherwise. This is no longer true, as ops.init() is invoked from the scx_enable_helper thread, which can run on any CPU. As a result, sched_setaffinity() from userspace doesn't work, causing scx_central to fail when loading with: [ 1985.319942] sched_ext: central: scx_central.bpf.c:314: init from non-central CPU [ 1985.320317] scx_exit+0xa3/0xd0 [ 1985.320535] scx_bpf_error_bstr+0xbd/0x220 [ 1985.320840] bpf_prog_3a445a8163fa8149_central_init+0x103/0x1ba [ 1985.321073] bpf__sched_ext_ops_init+0x40/0xa8 [ 1985.321286] scx_root_enable_workfn+0x507/0x1650 [ 1985.321461] kthread_worker_fn+0x260/0x940 [ 1985.321745] kthread+0x303/0x3e0 [ 1985.321901] ret_from_fork+0x589/0x7d0 [ 1985.322065] ret_from_fork_asm+0x1a/0x30 DEBUG DUMP =================================================================== central: root scx_enable_help[134] triggered exit kind 1025: scx_bpf_error (scx_central.bpf.c:314: init from non-central CPU) Fix this by: - Defer bpf_timer_start() to the first dispatch on the central CPU. - Initialize the BPF timer in central_init() and kick the central CPU to guarantee entering the dispatch path on the central CPU immediately. - Remove the unnecessary sched_setaffinity() call in userspace. Suggested-by: Tejun Heo <tj@kernel.org> Signed-off-by: Zhao Mengmeng <zhaomengmeng@kylinos.cn> Signed-off-by: Tejun Heo <tj@kernel.org>
2026-03-27selftests/bpf: add block device management selftestsChristian Brauner
Add selftests to test block device tracking for bpf lsm programs. Signed-off-by: Christian Brauner <brauner@kernel.org> Link: https://lore.kernel.org/r/20260326-work-bpf-bdev-v2-2-5e3c58963987@kernel.org Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2026-03-27RISC-V: KVM: selftests: Fix firmware counter read in sbi_pmu_testJiakai Xu
The current sbi_pmu_test attempts to read firmware counters without configuring them first with SBI_EXT_PMU_COUNTER_CFG_MATCH. Previously this did not fail because KVM incorrectly allowed the read and accessed fw_event[] with an out-of-bounds index when the counter was unconfigured. After fixing that bug, the read now correctly returns SBI_ERR_INVALID_PARAM, causing the selftest to fail. Update the test to configure a firmware event before reading the counter. Also add a negative test to ensure that attempting to read an unconfigured firmware counter fails gracefully. Signed-off-by: Jiakai Xu <xujiakai2025@iscas.ac.cn> Signed-off-by: Jiakai Xu <jiakaiPeanut@gmail.com> Reviewed-by: Andrew Jones <andrew.jones@oss.qualcomm.com> Reviewed-by: Nutty Liu <nutty.liu@hotmail.com> Link: https://lore.kernel.org/r/20260316014533.2312254-3-xujiakai2025@iscas.ac.cn Signed-off-by: Anup Patel <anup@brainfault.org>
2026-03-27selftests: ALSA: Skip utimer test when CONFIG_SND_UTIMER is not enabledBen Copeland
The timer_f.utimer test hard-fails with ASSERT_EQ when SNDRV_TIMER_IOCTL_CREATE returns -1 on kernels without CONFIG_SND_UTIMER. This causes the entire alsa kselftest suite to report a failure rather than skipping the unsupported test. When CONFIG_SND_UTIMER is not enabled, the ioctl is not recognised and the kernel returns -ENOTTY. If the timer device or subdevice does not exist, -ENXIO is returned. Skip the test in both cases, but still fail on any other unexpected error. Suggested-by: Mark Brown <broonie@kernel.org> Link: https://lore.kernel.org/linux-kselftest/0e9c25d3-efbd-433b-9fb1-0923010101b9@stanley.mountain/ Signed-off-by: Ben Copeland <ben.copeland@linaro.org> Reviewed-by: Mark Brown <broonie@kernel.org> Link: https://patch.msgid.link/20260319124521.191491-1-ben.copeland@linaro.org Signed-off-by: Takashi Iwai <tiwai@suse.de>
2026-03-26selftests: net: Remove unnecessary backslashes in fq_band_pktlimit.shYohei Kojima
Address "grep: warning: stray \ before white space" warning from GNU grep 3.12. This warns the misplaced backslashes before whitespaces (e.g. \\' ' or '\ ') which leads to unspecified behavior [1]. We can just remove the backslashes before whitespaces as POSIX says: Enclosing characters in single-quotes ('') shall preserve the literal value of each character within the single-quotes. and bourne-compatible shells behave so. [1]: https://lists.gnu.org/r/bug-gnulib/2022-05/msg00057.html Signed-off-by: Yohei Kojima <yk@y-koj.net> Reviewed-by: Simon Horman <horms@kernel.org> Link: https://patch.msgid.link/dd0bbd48cdf468da56ec34fd61cecd4d2111d7ba.1774372510.git.yk@y-koj.net Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-03-26selftests: add check for seg6 tunsrcJustin Iurman
Extend srv6_hencap_red_l3vpn_test.sh to include checks for the new "tunsrc" feature. If there is no support for tunsrc, it silently falls back to the encap config without tunsrc. Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Justin Iurman <justin.iurman@6wind.com> Reviewed-by: Andrea Mayer <andrea.mayer@uniroma2.it> Link: https://patch.msgid.link/20260324091434.359341-3-justin.iurman@6wind.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>
2026-03-26Revert "selftests/sched_ext: Add tests for SCX_ENQ_IMMED and ↵Tejun Heo
scx_bpf_dsq_reenq()" This reverts commit c50dcf533149. The tests are superficial, likely AI-generated slop, and flaky. They don't add actual value and just churn the selftests. Signed-off-by: Tejun Heo <tj@kernel.org>
2026-03-26perf report: Add comm_nodigit sort keyStephen Brennan
The "comm" column allows grouping events by the process command. It is intended to group like programs, despite having different PIDs. But some workloads may adjust their own command, so that a unique identifier (e.g. a PID or some other numeric value) is part of the command name. This destroys the utility of "comm", forcing perf to place each unique process name into its own bucket, which can contribute to a combinatorial explosion of memory use in perf report. Create a less strict version of this column, which ignores digits when comparing command names. Commands whose names are the same (ignoring digits) are sorted into the same histogram buckets, and displayed with the placeholder value "<N>" in the place of digits. For example, hypothetical command names "kworker/1" "kworker/2" "kworker/3" would sort into the same bucket and be represented as "kworker/<N>". Committer testing: $ perf report -s comm,comm_nodigit | grep -F "<N>" 0.01% CPU 6/TCG CPU <N>/TCG 0.01% kworker/53:2-mm kworker/<N>:<N>-mm 0.01% migration/24 migration/<N> 0.01% kworker/24:1-ev kworker/<N>:<N>-ev 0.01% llvmpipe-8 llvmpipe-<N> Signed-off-by: Stephen Brennan <stephen.s.brennan@oracle.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-03-26perf stat: Fix opt->value type for parse_cache_levelIan Rogers
Commit f5803651b4a4 ("perf stat: Choose the most disaggregate command line option") changed aggregation option handling for `perf stat` but not `perf stat report` leading to parse_cache_level being passed a struct in the `perf stat` case but erroneously an aggr_mode enum value for `perf stat report`. Change the `perf stat report` aggregation handling to use the same opt_aggr_mode as `perf stat`. Also, just pass the boolean for consistency with other boolean argument handling. Fixes: f5803651b4a4 ("perf stat: Choose the most disaggregate command line option") Signed-off-by: Ian Rogers <irogers@google.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-03-26perf lock: Fix option value type in parse_max_stackIan Rogers
The value is a void* and the address of an int, max_stack_depth, is set up in the perf lock options. The parse_max_stack function treats the int* as a long*, make this more correct by declaring the value to be an int*. Fixes: 0a277b622670 ("perf lock contention: Check --max-stack option") Signed-off-by: Ian Rogers <irogers@google.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-03-26perf record: Add support for arch_sdt_arg_parse_op() on s390Thomas Richter
commit e5e66adfe45a6 ("perf regs: Remove __weak attributive arch_sdt_arg_parse_op() function") removes arch_sdt_arg_parse_op() functions and reveals missing s390 support. The following warning is printed: Unknown ELF machine 22, standard arguments parse will be skipped. ELF machine 22 is the EM_S390 host. This happens with command # ./perf record -v -- stress-ng -t 1s --matrix 0 when the event is not specified. Add s390 specific __perf_sdt_arg_parse_op_s390() function to support -architecture calls to arch_sdt_arg_parse_op() for s390. The warning disappears. Signed-off-by: Thomas Richter <tmricht@linux.ibm.com> Reviewed-by: Ian Rogers <irogers@google.com> Tested-by: Jan Polensky <japo@linux.ibm.com> Cc: Dapeng Mi <dapeng1.mi@linux.intel.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-03-26tools build: Correct link flags for libopensslLeo Yan
The perf static build reports that the BPF skeleton is disabled due to the missing libopenssl feature. Use PKG_CONFIG to determine the link flags for libopenssl. Add "--static" to the PKG_CONFIG command for static linking. Fixes: 7678523109d1 ("tools/build: Add a feature test for libopenssl") Signed-off-by: Leo Yan <leo.yan@arm.com> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
2026-03-26selftests/bpf: Test kind encoding/decodingAlan Maguire
verify btf__new_empty_opts() adds layouts for all kinds supported, and after adding kind-related types for an unknown kind, ensure that parsing uses this info when that kind is encountered rather than giving up. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260326145444.2076244-9-alan.maguire@oracle.com
2026-03-26libbpf: Support sanitization of BTF layout for older kernelsAlan Maguire
Add a FEAT_BTF_LAYOUT feature check which checks if the kernel supports BTF layout information. Also sanitize BTF if it contains layout data but the kernel does not support it. The sanitization requires rewriting raw BTF data to update the header and eliminate the layout section (since it lies between the types and strings), so refactor sanitization to do the raw BTF retrieval and creation of updated BTF, returning that new BTF on success. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260326145444.2076244-7-alan.maguire@oracle.com
2026-03-26libbpf: BTF validation can use layout for unknown kindsAlan Maguire
BTF parsing can use layout to navigate unknown kinds, so btf_validate_type() should take layout information into account to avoid failure when an unrecognized kind is met. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260326145444.2076244-6-alan.maguire@oracle.com
2026-03-26libbpf: Add layout encoding supportAlan Maguire
Support encoding of BTF layout data via btf__new_empty_opts(). Current supported opts are base_btf and add_layout. Layout information is maintained in btf.c in the layouts[] array; when BTF is created with the add_layout option it represents the current view of supported BTF kinds. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260326145444.2076244-5-alan.maguire@oracle.com
2026-03-26libbpf: Use layout to compute an unknown kind sizeAlan Maguire
This allows BTF parsing to proceed even if we do not know the kind. Fall back to base BTF layout if layout information is not in split BTF. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/20260326145444.2076244-4-alan.maguire@oracle.com
generated by cgit v1.2.3 (git 2.39.1) at 2026-09-19 06:16:28 +0000