From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
To: bpf@vger.kernel.org
Cc: Alexei Starovoitov <ast@kernel.org>,
Andrii Nakryiko <andrii@kernel.org>,
Daniel Borkmann <daniel@iogearbox.net>,
Martin KaFai Lau <martin.lau@kernel.org>,
Eduard Zingerman <eddyz87@gmail.com>,
Mykyta Yatsenko <yatsenko@meta.com>,
kkd@meta.com, kernel-team@meta.com
Subject: [RFC PATCH bpf-next v1 2/6] bpf: Allow timing functions in lock critical sections
Date: Wed, 11 Feb 2026 10:12:42 -0800 [thread overview]
Message-ID: <20260211181248.3040142-3-memxor@gmail.com> (raw)
In-Reply-To: <20260211181248.3040142-1-memxor@gmail.com>
Allow timing related functions in critical sections, which is useful to
measure the time spent acquiring a lock inside BPF programs.
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
kernel/bpf/verifier.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index edf5342b982f..4acd8e848c88 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -21044,7 +21044,11 @@ static int do_check_insn(struct bpf_verifier_env *env, bool *do_print_state)
if (env->cur_state->active_locks) {
if ((insn->src_reg == BPF_REG_0 &&
- insn->imm != BPF_FUNC_spin_unlock) ||
+ insn->imm != BPF_FUNC_spin_unlock &&
+ insn->imm != BPF_FUNC_ktime_get_ns &&
+ insn->imm != BPF_FUNC_ktime_get_boot_ns &&
+ insn->imm != BPF_FUNC_ktime_get_coarse_ns &&
+ insn->imm != BPF_FUNC_ktime_get_tai_ns) ||
(insn->src_reg == BPF_PSEUDO_KFUNC_CALL &&
(insn->off != 0 || !kfunc_spin_allowed(insn->imm)))) {
verbose(env,
--
2.47.3
next prev parent reply other threads:[~2026-02-11 18:12 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-02-11 18:12 [RFC PATCH bpf-next v1 0/6] Concurrency Testing Kumar Kartikeya Dwivedi
2026-02-11 18:12 ` [RFC PATCH bpf-next v1 1/6] bpf: Support repeat, duration fields for syscall prog runs Kumar Kartikeya Dwivedi
2026-02-11 22:02 ` Alexei Starovoitov
2026-02-11 18:12 ` Kumar Kartikeya Dwivedi [this message]
2026-02-11 18:12 ` [RFC PATCH bpf-next v1 3/6] bpf: Enable rqspinlock in tracing progs Kumar Kartikeya Dwivedi
2026-02-11 22:04 ` Alexei Starovoitov
2026-02-11 18:12 ` [RFC PATCH bpf-next v1 4/6] selftests/bpf: Introduce concurrency testing tool Kumar Kartikeya Dwivedi
2026-02-11 22:08 ` Alexei Starovoitov
2026-02-11 18:12 ` [RFC PATCH bpf-next v1 5/6] selftests/bpf: Generate various conctest permutations Kumar Kartikeya Dwivedi
2026-02-11 22:09 ` Alexei Starovoitov
2026-02-11 18:12 ` [RFC PATCH bpf-next v1 6/6] selftests/bpf: Extend conctest to wq and task_work Kumar Kartikeya Dwivedi
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