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Tue, 20 Jan 2026 07:59:32 -0800 (PST) Received: from localhost ([2a01:4b00:bd1f:f500:e85d:a828:282d:d5c7]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-43569921f6esm29513207f8f.4.2026.01.20.07.59.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 20 Jan 2026 07:59:32 -0800 (PST) From: Mykyta Yatsenko Date: Tue, 20 Jan 2026 15:59:16 +0000 Subject: [PATCH bpf-next v6 07/10] bpf: Introduce bpf_timer_cancel_async() kfunc Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20260120-timer_nolock-v6-7-670ffdd787b4@meta.com> References: <20260120-timer_nolock-v6-0-670ffdd787b4@meta.com> In-Reply-To: <20260120-timer_nolock-v6-0-670ffdd787b4@meta.com> To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org, daniel@iogearbox.net, kafai@meta.com, kernel-team@meta.com, memxor@gmail.com, eddyz87@gmail.com Cc: Mykyta Yatsenko X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1768924764; l=1347; i=yatsenko@meta.com; s=20251031; h=from:subject:message-id; bh=y2jTZOKHHT4CaVUapMPQ7MROns+nzqDKrEL3NPsA0VQ=; b=krXBZ2MbDNIMMiLbw0d5nUnl9RHC4yJlLVSgBzJ0I1e1uh00EH/qUZDjsCNzLEJRK9oaURQy0 rd+0ULHOFp8C59yn4eVdRaHndJOU70ElygubhMb6niH7WGleHVCFreF X-Developer-Key: i=yatsenko@meta.com; a=ed25519; pk=TFoLStOoH/++W4HJHRgNr8zj8vPFB1W+/QECPcQygzo= From: Mykyta Yatsenko introducing bpf timer cancel kfunc that attempts canceling timer asynchronously, hence, supports working in NMI context. Signed-off-by: Mykyta Yatsenko --- kernel/bpf/helpers.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/kernel/bpf/helpers.c b/kernel/bpf/helpers.c index 297723d3f146a6e2f2e3e2dbf249506ae35bf3a2..2acab81599b6d9f4dc6c5ba636b9f9bd46be9d81 100644 --- a/kernel/bpf/helpers.c +++ b/kernel/bpf/helpers.c @@ -4425,6 +4425,18 @@ __bpf_kfunc int bpf_dynptr_file_discard(struct bpf_dynptr *dynptr) return 0; } +__bpf_kfunc int bpf_timer_cancel_async(struct bpf_timer *timer) +{ + struct bpf_async_cb *cb; + struct bpf_async_kern *async = (void *)timer; + + cb = READ_ONCE(async->cb); + if (!cb) + return -EINVAL; + + return bpf_async_schedule_op(cb, BPF_ASYNC_CANCEL, 0, 0); +} + __bpf_kfunc_end_defs(); static void bpf_task_work_cancel_scheduled(struct irq_work *irq_work) @@ -4606,6 +4618,7 @@ BTF_ID_FLAGS(func, bpf_task_work_schedule_signal_impl) BTF_ID_FLAGS(func, bpf_task_work_schedule_resume_impl) BTF_ID_FLAGS(func, bpf_dynptr_from_file) BTF_ID_FLAGS(func, bpf_dynptr_file_discard) +BTF_ID_FLAGS(func, bpf_timer_cancel_async) BTF_KFUNCS_END(common_btf_ids) static const struct btf_kfunc_id_set common_kfunc_set = { -- 2.52.0