Changes in tracing_multi.c

5a8cd539ac19f7a68e68e1d25ef9ca2ff55b8500 - Merge tag 'bpf-next-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Thu, 20 Aug 2026 16:36:20 +0200

Merge tag 'bpf-next-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextPull bpf updates from Daniel Borkmann: "Major changes: - Redesign the verifier error reporting: failures now carry source and instruction annotations along with the causal event history that led to them, making program rejections far easier to debug and repair (Kumar Kartikeya Dwivedi) - Add arena argument support to kfuncs and struct_ops through the new __arena and __arena__nullable suffixes (Tejun Heo, Puranjay Mohan, Kumar Kartikeya Dwivedi, Ihor Solodrai) - Signed BPF program loader rework to accommodate both BPF and security community needs where the kernel runs the signature verification at BPF_PROG_LOAD time before the LSM admission hook (Daniel Borkmann) - Add a set of ksock kfuncs which let BPF LSM and syscall programs create, connect and send on UDP sockets in order to emit telemetry data (Mahe Tardy) - Unify helper and kfunc call argument verification and classify kfunc arguments purely from BTF into a generated bpf_func_proto which is computed once at add-call time (Amery Hung) Other features and fixes: - Enable EXECMEM_ROX_CACHE for BPF allocations on x86 (Mike Rapoport) - Add bidirectional VLAN support to bpf_fib_lookup() through the new BPF_FIB_LOOKUP_VLAN and BPF_FIB_LOOKUP_VLAN_INPUT flags (Avinash Duduskar) - Infer zext_dst from static register liveness analysis to fix 32-bit zero-extension semantics, and remove the artificial limitations on pointer types eligible for spilling (Eduard Zingerman) - Inline the numeric open-coded iterator kfuncs so that bpf_for() loops no longer pay a kfunc call on every iteration (Puranjay Mohan) - Add an arena-based bitmap data structure to libarena along with serial and parallel selftests (Emil Tsalapatis) - Teach resolve_btfids to discover kfuncs from the kernel's BTF ID sets and to emit kfunc BTF decl tags, reducing the kernel build's dependency on pahole features (Ihor Solodrai) - Add BPF_F_ADJ_ROOM_DECAP_* flags to bpf_skb_adjust_room() so that tunnel decapsulation can update the GSO and encapsulation state of the skb (Nick Hudson) - Fix the ring buffer pending_pos walk and the available-data accounting on 32-bit position wrap (Israel Téllez García) - Add memory usage accounting for arena maps and fix an mmap_lock deadlock on arena lock failure (Jiayuan Chen) - Add tracing_multi link info support to the kernel UAPI and bpftool, and refactor the stack map code to run with preemption disabled (Jiri Olsa) - Support BPF_F_EGRESS in bpf_redirect_peer() to emit the skb in the egress direction of the target's peer device (Jordan Rife) - Add a KF_SPINLOCK_SAFE kfunc flag so that providers, in particular modules, can declare kfuncs safe to call under bpf_spin_lock instead of relying on the verifier's hard-coded allowlist (Kaitao Cheng) - Introduce global percpu data for BPF programs with libbpf probing and bpftool skeleton support, and stop exposing uninitialized kernel heap memory when copying per-CPU map values (Leon Hwang) - Add s390 JIT support for load-acquire and store-release instructions (Maxim Khmelevskii) - Fix a CFI mismatch in the task work callback and an arm64 KASAN false positive after bpf_throw() (Mykyta Yatsenko) - Reject writes through untrusted BTF pointers and bound the rdonly/rdwr_buf_size kfunc arguments (Nicholas Dudar) - Invalidate RCU pointers only after the final spin unlock and account for preempt and IRQ disabled regions as overlapping RCU protection (Ning Ding) - Support mixing bpf2bpf calls and tail calls on RV64, add signed operations and 32-bit atomics to the RV32 JIT, and add timed may_goto support (Pu Lehui, Kuan-Wei Chiu, Feng Jiang) - Fix a use-after-free on mm_struct in bpf_find_vma() for foreign tasks and an mmap_lock leak in the irq_work path (Sanghyun Park) - Populate mmap-able BPF array map memory lazily which makes mmap() O(1) instead of proportional to the map size (Song Liu) - Introduce a jit_required flag and reject programs with inlined helpers when no JIT is available, where the interpreter would otherwise jump into an invalid address (Tiezhu Yang) - Fix the x86 JIT per-CPU address resolution into an extended register where the REX prefix dropped the high destination register bit (Vineet Gupta) - Reject MEM_ALLOC BTF accesses past object bounds, arena frees below the arena base, and mixed arena and ordinary atomic paths (Yiyang Chen) - Fix the trampoline handling of 128-bit arguments and of return values larger than 8 bytes (Yonghong Song) - Ensure that any fault prone load is rewritten with exception table handling, and fix the arena load-acquire and atomic fetch handling in the x86, arm64, riscv and s390 JITs (Daniel Borkmann) - Many more fixes and cleanups across the verifier, arena, trampolines, sockmap, cgroup, ring buffer, x86/arm64/riscv/s390 JITs, libbpf, bpftool, resolve_btfids and selftests"* tag 'bpf-next-7.3' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (373 commits) selftests/bpf: Add tests for a store on a fault prone qdisc pointer selftests/bpf: Add tests for fault prone loads out of RCU pointers selftests/bpf: Add tests for pointer type merge at a shared load selftests/bpf: Remove duplicate copies of the arena spinlock qnodes selftests/bpf: Retry stat generation in cgroup_iter_memcg selftests/bpf: Test pseudo-function policy diagnostics bpf: Distinguish function references in policy diagnostics bpf: Preserve source attribution without source text selftests/bpf: Test kfunc argument diagnostics bpf: Correct kfunc argument diagnostics bpf: Use canonical stack argument names in diagnostics bpf: Preserve R0 lineage across helper calls selftests/bpf: Exercise negative optlen in cgroup getsockopt hook bpf: Reject negative optlen in cgroup getsockopt hook selftests/bpf: tc_tunnel - validate decap GSO and encapsulation state bpf: Clear decap state on skb_adjust_room shrink path bpf: Allow new DECAP flags and add guard rails bpf: Add BPF_F_ADJ_ROOM_DECAP_* flags for tunnel decapsulation bpf: Refactor masks for ADJ_ROOM flags and encap validation bpf: Name the enum for BPF_FUNC_skb_adjust_room flags ... List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

fab183d632628381b466a41479489541ac0e29a0 - sched_ext: Merge branch 'for-7.3-arena-args' into for-7.3

Mon, 17 Aug 2026 23:20:34 +0200

sched_ext: Merge branch 'for-7.3-arena-args' into for-7.3Pull to receive the __arena argument conversion: 67f1f4a48c24 ("sched_ext: Pass kernel arena pointers to ops_cid callbacks") a8dc810968af ("sched_ext: Convert sub-cap kfuncs to __arena cmask arguments") a05c5b5cb5cf ("sched_ext: Convert scx_bpf_cid_override() to __arena array arguments")along with the bpf-next branch carrying the __arena argument support theydepend on.Conflict in kernel/sched/ext/ext.c between: c384ab8a0b13 ("sched_ext: Move the config-off sub-cap kfunc stubs into sub.c")and: a8dc810968af ("sched_ext: Convert sub-cap kfuncs to __arena cmask arguments")which updated the stubs in their old ext.c location. Resolved by keepingext.c without the stubs and applying the prototype conversion to therelocated stubs in sub.c.Signed-off-by: Tejun Heo List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

872a8f6b08069d1b4bfb9bf968dc629ab6998908 - Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next into for-7.3-arena-args

Tue, 11 Aug 2026 00:38:03 +0200

Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next into for-7.3-arena-argsPull bpf-next d114bb989367 ("Merge branch'add-arena-argument-support-to-kfuncs-and-struct_ops'") to make the __arenaand __arena__nullable kfunc and struct_ops argument suffixes available. Thesuffixed arguments will be used to convert sched_ext kfuncs and struct_opscallbacks that currently pass arena pointers as scalars and rebase them byhand. List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

9a3a07d06e7d74f4aecc51396c771149336ac55d - Merge branch 'bpf-fix-warning-in-bpf_trampoline_multi_detach'

Sun, 12 Jul 2026 01:55:52 +0200

Merge branch 'bpf-fix-warning-in-bpf_trampoline_multi_detach'Leon Hwang says:====================bpf: Fix WARNING in bpf_trampoline_multi_detachSince tracing_multi link does not set ftrace_managed, it would fail torelease the tracing_multi link when attaching tracing_multi link andthen attaching fentry link.[ 3.714215] WARNING: kernel/bpf/trampoline.c:1727 at bpf_trampoline_multi_detach+0x20b/0x240, CPU#1: test_progs/97...[ 3.733170] bpf_tracing_multi_link_release+0x14/0x30[ 3.733890] bpf_link_free+0x58/0x130[ 3.734414] bpf_link_release+0x23/0x30Fix it by setting 'ftrace_managed = true' in register_fentry_multi().Note: the reason of targeting bpf-next tree is I'm planning to addtracing_multi link support for bpf progs, that would rely on the fix andhave code conflict with the test.Changes:v1 -> v2:* Collect Acked-by from Jiri, thanks.* Check arg using tracing_multi_arg_check() in bpf prog in test. (per Sashiko)* v1: https://lore.kernel.org/bpf/20260710144734.78203-1-leon.hwang@linux.dev/====================Link: https://patch.msgid.link/20260711124822.29406-1-leon.hwang@linux.devSigned-off-by: Kumar Kartikeya Dwivedi List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

539d3edf8e53f10b2d63e2d866e23c414c99e921 - selftests/bpf: Test fentry link after tracing_multi link

Sat, 11 Jul 2026 14:48:22 +0200

selftests/bpf: Test fentry link after tracing_multi linkVerify that there's no any issue to attach tracing_multi link, then attachfentry link.Assisted-by: Codex:gpt-5.6-solSigned-off-by: Leon Hwang Acked-by: Jiri Olsa Link: https://lore.kernel.org/bpf/20260711124822.29406-3-leon.hwang@linux.devSigned-off-by: Kumar Kartikeya Dwivedi List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

0eaed89c18aeedf0898baf2dbf5ff027c6795152 - Merge tag 'timers-v7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource

Mon, 17 Aug 2026 10:29:52 +0200

Merge tag 'timers-v7.3-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/daniel.lezcano/linux into timers/clocksource - Use designated initializers for sh_mtu2, sh_cmt, and sh_tmu, and drop the unused initializer in the platform_device_id table for sh_mtu2 (Uwe Kleine-König) - Remove redundant dev_err()/dev_err_probe() messages when devm_request_*_irq() fails, as the helper already logs an error message (Pan Chuang) - Fix a boot hang on Allwinner D1 when a forced minimum delta is used with the sun4i timer (Felix Yan) - Fix an IRQ leak in the cpuhp_setup_state() error path by freeing the IRQ on failure in the NXP PIT driver (WenTao Liang) - Fix incorrect unmapping of shared MMIO between the clocksource and clockevent drivers. If one of them fails to initialize, the error path unmaps the shared MMIO region, leaving the other driver with an invalid mapping on clps711x (Guangshuo Li) - Make the samsung_pwm driver compatible with PREEMPT_RT by replacing regular spinlocks with raw_spinlock_t in atomic contexts (Marek Szyprowski) - Use __raw_readl() and __raw_writel() instead of ioread32() and iowrite32() to support SWAP_IO_SPACE in the rtl-otto driver (Rustam Adilov) - Fix a missing clk_disable_unprepare() call in the timer initialization error path of the Armada driver (Yuho Choi)Link: https://lore.kernel.org/lkml/75feea31-683d-45a1-87f4-ab045e0152ae@oss.qualcomm.com List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

b4d85f863e5a6f1fa01b186001af0f68f4f5239e - Merge branch 'next' into for-linus

Sat, 15 Aug 2026 06:26:07 +0200

Merge branch 'next' into for-linusPrepare input updates for 7.3 merge window. List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

76904fccf81936c084faebc73ac72c0919a42941 - Merge tag 'v7.2-rc3' into next

Tue, 14 Jul 2026 04:06:00 +0200

Merge tag 'v7.2-rc3' into nextSync up with mainline to pull in stable fixes to avoid merge conflicts. List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

00599d4841790d05401820a96cf7edb193888b00 - Merge drm/drm-fixes into drm-misc-fixes

Mon, 29 Jun 2026 17:58:00 +0200

Merge drm/drm-fixes into drm-misc-fixesPull in tag v7.2-rc1 so that drm-misc-fixes becomes useful again,and drm-misc-next-fixes can be closed.Signed-off-by: Maarten Lankhorst List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

872cc6abda1507429b97cc7b42a9dae51ee0a668 - Merge tag 'bpf-next-7.2' into loongarch-next

Mon, 22 Jun 2026 05:29:06 +0200

Merge tag 'bpf-next-7.2' into loongarch-nextLoongArch architecture changes for 7.2 need the bpf changes to add newfeatures, so merge 'bpf-next-7.2' to create a base. List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

9611c0ce215a66770ccbe5c126bf57ba8c31bcad - Merge commit '6beaec3aee9852438b89e4d7891caf5e84d45851' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into gpio/for-current

Fri, 19 Jun 2026 10:50:17 +0200

Merge commit '6beaec3aee9852438b89e4d7891caf5e84d45851' of git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux into gpio/for-currentThis pulls in the merge commit for MFD updates for v7.2. The PR containsa build-time dependency of one of the GPIO commits that will follow. List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

9c87e61e3c5797277407ba5eae4eac8a52be3fa3 - Merge tag 'bpf-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next

Wed, 17 Jun 2026 10:18:14 +0200

Merge tag 'bpf-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-nextPull bpf updates from Alexei Starovoitov: "Major changes: - Recover from BPF arena page faults using a scratch page and add ptep_try_set() for lockless empty-slot installs on x86 and arm64. This allows BPF kfuncs to access arena pointers directly. The 'arena_direct_access' stable branch was created for this work and was pulled into sched-ext and bpf-next trees (Tejun Heo, Kumar Kartikeya Dwivedi) - Lift old restriction and support 6+ arguments in BPF programs and kfuncs on x86 and arm64 (Yonghong Song, Puranjay Mohan) Other features and fixes: - Add 24-bit BTF vlen and reclaim unused bits in the BTF UAPI to ease addition of new BTF kinds (Alan Maguire) - Raise the maximum BPF call chain depth from 8 to 16 frames (Alexei Starovoitov) - Refactor object relationship tracking in the verifier and fix a dynptr use-after-free bug (Amery Hung) - Harden the signed program loader and reject exclusive maps as inner maps (Daniel Borkmann) - Replace the verifier min/max bounds fields with a circular number (cnum) representation and improve 32->64 bit range refinements (Eduard Zingerman) - Introduce the arena library and runtime (libarena) with a buddy allocator, rbtree and SPMC queue data structures, ASAN support and a parallel test harness. Allow subprograms to return arena pointers and switch to a BTF type-tag based __arena annotation (Emil Tsalapatis) - Cache build IDs in the sleepable stackmap path and avoid faultable build ID reads under mm locks (Ihor Solodrai) - Introduce the tracing_multi link to attach a single BPF program to many kernel functions at once. Allow specifying the uprobe_multi target via FD (Jiri Olsa) - Extend the bpf_list family of kfuncs with bpf_list_add/del(), and bpf_list_is_first/is_last/empty() (Kaitao Cheng) - Extend the BPF syscall with common attributes support for prog_load, btf_load and map_create (Leon Hwang) - Wrap rhashtable as BPF map (Mykyta Yatsenko, Herbert Xu) - Add sleepable support for tracepoint programs and fix deadlocks in LRU map due to NMI reentry (Mykyta Yatsenko) - Fix OOB access in bpf_flow_keys, fix nullness analysis of inner arrays, enforce write checks for global subprograms (Nuoqi Gui) - Report the maximum combined stack depth and print a breakdown of instructions processed per subprogram (Paul Chaignon) - Add an XDP load-balancer benchmark and arm64 JIT support for stack arguments (Puranjay Mohan) - Add kfuncs to traverse over wakeup_sources (Samuel Wu) - Allow sleepable BPF programs to use LPM trie maps directly (Vlad Poenaru) - Many more fixes and cleanups across the verifier, BTF, sockmap, devmap, bpffs, security hooks, s390/riscv/loongarch JITs, rqspinlock, libbpf, bpftool, selftests"* tag 'bpf-next-7.2' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next: (336 commits) selftests/bpf: Work around llvm stack overflow in crypto progs selftests/bpf: add test for bpf_msg_pop_data() overflow bpf, sockmap: fix integer overflow in bpf_msg_pop_data() bounds check sockmap: Fix use-after-free in udp_bpf_recvmsg() bpf, sockmap: keep sk_msg copy state in sync bpf, sockmap: Fix wrong rsge offset in bpf_msg_push_data() bpf, sockmap: reject overflowing copy + len in bpf_msg_push_data() selftsets/bpf: Retry map update on helper_fill_hashmap() selftests/bpf: Add test for sleepable lsm_cgroup rejection selftests/bpf: Add test to verify the fix for bpf_setsockopt() helper bpf: Fix bpf_get/setsockopt to tos for ipv4-mapped ipv6 socket selftests/bpf: Avoid static LLVM linking for cross builds selftests/bpf: Use common CFLAGS for urandom_read selftests/bpf: Initialize operation name before use tools/bpf: build: Append extra cflags libbpf: Initialize CFLAGS before including Makefile.include bpftool: Append extra host flags bpftool: Avoid adding EXTRA_CFLAGS to HOST_CFLAGS bpftool: Pass host flags to bootstrap libbpf selftests/bpf: correct CONFIG_PPC64 macro name in comment ... List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

c49f336dbcf30ff8622d3725c54fe1c90e8ccd9c - Merge branch 'bpf-tracing_multi-link'

Sun, 07 Jun 2026 19:03:03 +0200

Merge branch 'bpf-tracing_multi-link'Jiri Olsa says:====================bpf: tracing_multi linkAdd tracing_multi link support that allows fast attachmentof tracing program to many functions.RFC: https://lore.kernel.org/bpf/20260203093819.2105105-1-jolsa@kernel.org/v1: https://lore.kernel.org/bpf/20260220100649.628307-1-jolsa@kernel.org/v2: https://lore.kernel.org/bpf/20260304222141.497203-1-jolsa@kernel.org/v3: https://lore.kernel.org/bpf/20260316075138.465430-1-jolsa@kernel.org/v4: https://lore.kernel.org/bpf/20260324081846.2334094-1-jolsa@kernel.org/v5: https://lore.kernel.org/bpf/20260417192502.194548-1-jolsa@kernel.org/v6: https://lore.kernel.org/bpf/20260527113951.46265-1-jolsa@kernel.org/v7: https://lore.kernel.org/bpf/20260603110554.29590-1-jolsa@kernel.org/v8 changes:- add back the btf_is_union check to btf_get_type_size [sashiko]v7 changes:- added ftrace_hash_count stub for !CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS cade [sashiko]- selftests fixes [sashiko]- use hash_ptr in select_trampoline_lock [sashiko]- changed the check duplicate logic in check_dup_ids [sashiko]- use sort_r_nonatomic in check_dup_ids [sashiko]- added BPF_TRACE_FSESSION_MULTI to can_be_sleepable, plus added testcase for sleepable fsession- make bpf_tracing_multi_opts pointer fields as const- add ___migrate_enable to trace_blacklistv6 changes:- move ftrace_hash_count declaration under CONFIG_DYNAMIC_FTRACE_WITH_DIRECT_CALLS [sashiko]- fix ftrace_hash_remove check/deref [sashiko]- disable context access for multi programs by using stub function with no arguments for verification [sashiko]- add __used for bpf_multi_func, and removed arguments, we do not allow direct access [sashiko]- rebased on latest loongarch changes, fix ppc build- guard update_ftrace_direct_del with ftrace_hash_count on rollback [sashiko]- fix noreturn attachment condition in bpf_check_attach_btf_id_multi [sashiko]- fail early on multiple same IDs provided by user [sashiko]- fix selftests error paths [sashiko]- add MAX_RESOLVE_DEPTH check to btf_get_type_size [sashiko]- use btf__pointer_size [sashiko]- fixed compilation on powerpc [sashiko]- added verifier fails selftest- after discussing with Song, it was determined that cleaning up FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY_PEER is not strictly necessary — keeping the trampoline in the ipmodify_enabled state is acceptable. The race condition this introduces remains unlikely, so the concern raised in [1] will not be addressed at this time. [1] https://lore.kernel.org/bpf/aec7bAbGlnEo3R1g@krava/v5 changes:- add dedicated hashes used for detach, so there's no need to allocate them on detach [sashiko]- safely release old trampoline images [sashiko]- add cond_resched() to couple of loops [sashiko]- validate attr->link_create.target_fd [sashiko]- allow only bpf_get_func_ret() for return value retrieval [sashiko]- do not allow attachment of fexit/fsession_multi for noreturn functions [sashiko]- fixed double free/close in libbpf btf cleanup, in separate patch [sashiko]- make btf_type_is_traceable_func closer to btf_distill_func_proto [sashiko]- add prog->attach_btf_obj_fd check to collect_func_ids_by_glob, to check we don't load module programs for kernel [sashiko]- make sure program is loaded in bpf_program__attach_tracing_multi [sashiko]- several selftests fixes [sashiko]- add attach_type to fdinfo output [Leon Hwang]- selftests cleanup fixes [Leon Hwang]v4 changes:- unlink rollback fix (added ftrace_hash_count) [bot]- use const for some bpf_link_create_opts tracing_multi members [bot]- adding missing comment for lockdep keys [bot]- selftest error path fixes (leaks) and other assorted test fixes [Leon Hwang]- several compile fixes wrt CONFIG_BPF_SYSCALL and CONFIG_BPF_JIT [kernel test robot]- make ftrace_hash_clear global, because it's needed in rollbackv3 changes:- fix module parsing [Leon Hwang]- use function traceable check from libbpf [Leon Hwang]- use ptr_to_u64 and fix/updated few comments [ci]- display cookies as decimal numbers [ci]- added link_create.flags check [ci]- fix error path in bpf_trampoline_multi_detach [ci]- make fentry/fexit.multi not extendable [ci]- add missing OPTS_VALID to bpf_program__attach_tracing_multi [ci]v2 changes:- allocate data.unreg in bpf_trampoline_multi_attach for rollback path [ci] and fixed link count setup in rollback path [ci]- several small assorted fixes [ci]- added loongarch and powerpc changes for struct bpf_tramp_node change- added support to attach functions from modules- added tests for sleepable programs- added rollback testsv1 changes:- added ftrace_hash_count as wrapper for hash_count [Steven]- added trampoline mutex pool [Andrii]- reworked 'struct bpf_tramp_node' separatoin [Andrii] - the 'struct bpf_tramp_node' now holds pointer to bpf_link, which is similar to what we do for uprobe_multi; I understand it's not a fundamental change compared to previous version which used bpf_prog pointer instead, but I don't see better way of doing this.. I'm happy to discuss this further if there's better idea- reworked 'struct bpf_fsession_link' based on bpf_tramp_node- made btf__find_by_glob_kind function internal helper [Andrii]- many small assorted fixes [Andrii,CI]- added session support [Leon Hwang]- added cookies support- added more testsNote I plan to send linkinfo support separately, the patchset is big enough.thanks,jirka====================Link: https://patch.msgid.link/20260606123955.345967-1-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

b349efe49a123f032e54d7e894d708ea5daa10d2 - selftests/bpf: Add tracing multi attach rollback tests

Sat, 06 Jun 2026 14:39:54 +0200

selftests/bpf: Add tracing multi attach rollback testsAdding tests for the rollback code when the tracing_multilink won't get attached, covering 2 reasons: - wrong btf id passed by user, where all previously allocated trampolines will be released - trampoline for requested function is fully attached (has already maximum programs attached) and the link fails, the rollback code needs to release all previously link-ed trampolines and release themWe need the bpf_fentry_test* unattached for the tests to pass,so the rollback tests are serial.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-30-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

4db8f60b6baf64f4f405bc8eb92a36315b353481 - selftests/bpf: Add tracing multi attach benchmark test

Sat, 06 Jun 2026 14:39:53 +0200

selftests/bpf: Add tracing multi attach benchmark testAdding benchmark test that attaches to (almost) all allowed tracingfunctions and display attach/detach times. # ./test_progs -t tracing_multi_bench_attach -v bpf_testmod.ko is already unloaded. Loading bpf_testmod.ko... Successfully loaded bpf_testmod.ko. serial_test_tracing_multi_bench_attach:PASS:btf__load_vmlinux_btf 0 nsec serial_test_tracing_multi_bench_attach:PASS:tracing_multi_bench__open_and_load 0 nsec serial_test_tracing_multi_bench_attach:PASS:get_syms 0 nsec serial_test_tracing_multi_bench_attach:PASS:bpf_program__attach_tracing_multi 0 nsec serial_test_tracing_multi_bench_attach: found 51186 functions serial_test_tracing_multi_bench_attach: attached in 1.295s serial_test_tracing_multi_bench_attach: detached in 0.243s #507 tracing_multi_bench_attach:OK Summary: 1/0 PASSED, 0 SKIPPED, 0 FAILED Successfully unloaded bpf_testmod.ko.Exporting skip_entry as is_unsafe_function and using it in the test.Also updating trace_blacklist with ___migrate_enable to be in syncwith kernel functions deny list.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-29-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

443c91d08c4bf48caeab6243edaca4e987573d8a - selftests/bpf: Add tracing multi verifier fails test

Sat, 06 Jun 2026 14:39:52 +0200

selftests/bpf: Add tracing multi verifier fails testAdding tests for verifier fails on tracing multi programs.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-28-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

1fd8328549979d96540252fa826481df93885a5a - selftests/bpf: Add tracing multi attach fails test

Sat, 06 Jun 2026 14:39:51 +0200

selftests/bpf: Add tracing multi attach fails testAdding tests for attach fails on tracing multi link.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-27-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

69f25d4b0c17cc947ce26391cac0015182b07dc0 - selftests/bpf: Add tracing multi session test

Sat, 06 Jun 2026 14:39:50 +0200

selftests/bpf: Add tracing multi session testAdding tests for tracing multi link session.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-26-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

1b938f42f5fa1789d0dcc2b9aa6262edba3a7f51 - selftests/bpf: Add tracing multi cookies test

Sat, 06 Jun 2026 14:39:49 +0200

selftests/bpf: Add tracing multi cookies testAdding tests for using cookies on tracing multi link.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-25-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c

4309f580a0a6608bd0c0fe090ef5283173ff4f1a - selftests/bpf: Add tracing multi intersect tests

Sat, 06 Jun 2026 14:39:48 +0200

selftests/bpf: Add tracing multi intersect testsAdding tracing multi tests for intersecting attached functions.Using bits from (from 1 to 16 values) to specify (up to 4) attachedprograms, and randomly choosing bpf_fentry_test* functions they areattached to.Signed-off-by: Jiri Olsa Link: https://lore.kernel.org/r/20260606123955.345967-24-jolsa@kernel.orgSigned-off-by: Alexei Starovoitov List of files: /linux/tools/testing/selftests/bpf/prog_tests/tracing_multi.c