From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 1BD34D2D8DA for ; Tue, 27 Jan 2026 09:46:24 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 816826B009B; Tue, 27 Jan 2026 04:46:23 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 7C3216B009D; Tue, 27 Jan 2026 04:46:23 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 6C5686B009E; Tue, 27 Jan 2026 04:46:23 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0011.hostedemail.com [216.40.44.11]) by kanga.kvack.org (Postfix) with ESMTP id DC5096B009B for ; Tue, 27 Jan 2026 04:46:22 -0500 (EST) Received: from smtpin23.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id A69A3D4059 for ; Tue, 27 Jan 2026 09:46:22 +0000 (UTC) X-FDA: 84377263404.23.FC9F013 Received: from out-179.mta1.migadu.com (out-179.mta1.migadu.com [95.215.58.179]) by imf19.hostedemail.com (Postfix) with ESMTP id EDC7A1A0003 for ; Tue, 27 Jan 2026 09:46:20 +0000 (UTC) Authentication-Results: imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=P7Htg7Dy; spf=pass (imf19.hostedemail.com: domain of hui.zhu@linux.dev designates 95.215.58.179 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769507181; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=qJzfS1JLGvEK+FxWqw8ITpq79hNz1KKD0GGXddU0FBc=; b=Kv+OGBZv1wHW+zwCBPImfeaU/fE3eSTMoyajHpvXJlxwflv6AzqKEc/B4LHsnkFG4uOvIp P7iSEYHbezP601bGP0ahokGLb86hyIWc96uqrnwpJuJ2sd1iGAefPI6BIAwO5kKm0mIcIH afQ3tSsLs9HqsGCClkdvQu3Ivmgqn6c= ARC-Authentication-Results: i=1; imf19.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=P7Htg7Dy; spf=pass (imf19.hostedemail.com: domain of hui.zhu@linux.dev designates 95.215.58.179 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev; dmarc=pass (policy=none) header.from=linux.dev ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769507181; a=rsa-sha256; cv=none; b=kPWonpnmRiDxSzTNIvTgNutyVCa8/yoVF45aowjDZ8vuFv36vVnUrWYFjRO2cqULGUMw2T RkEE9/aQpJ3J1oaZWAYCCICbVB8yS/uWCg8ccWoQCxXN809PMQCvzb2Xg7A2mi1cSDJ584 pInITOHEZNXSzwMOVRcMQQx4XTj5nVE= X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1769507179; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=qJzfS1JLGvEK+FxWqw8ITpq79hNz1KKD0GGXddU0FBc=; b=P7Htg7Dy6LcFd8R8VdXfIlRFf756CP3aQQqE0Z/k6TdgZY0LGPPqD7tubppy+ucyIppTJs XszAcPfj7QDhMZd//Q4CaJNlXtS7x69b7nbUy3/UywCdzCv5CntwBtC4qKsYL3g4YWzCCM 7Ul2OpmeuFE7OHLo8g03BDqHNO0XCr4= From: Hui Zhu To: Andrew Morton , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Alexei Starovoitov , Daniel Borkmann , Andrii Nakryiko , Martin KaFai Lau , Eduard Zingerman , Song Liu , Yonghong Song , John Fastabend , KP Singh , Stanislav Fomichev , Hao Luo , Jiri Olsa , Shuah Khan , Peter Zijlstra , Miguel Ojeda , Nathan Chancellor , Kees Cook , Tejun Heo , Jeff Xu , mkoutny@suse.com, Jan Hendrik Farr , Christian Brauner , Randy Dunlap , Brian Gerst , Masahiro Yamada , davem@davemloft.net, Jakub Kicinski , Jesper Dangaard Brouer , JP Kobryn , Willem de Bruijn , Jason Xing , Paul Chaignon , Anton Protopopov , Amery Hung , Chen Ridong , Lance Yang , Jiayuan Chen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, bpf@vger.kernel.org, netdev@vger.kernel.org, linux-kselftest@vger.kernel.org Cc: Hui Zhu , Geliang Tang Subject: [RFC PATCH bpf-next v5 06/12] bpf: Pass flags in bpf_link_create for struct_ops Date: Tue, 27 Jan 2026 17:45:50 +0800 Message-ID: <6b2d4fa8e5209d363f553d7851d5a1156137d9fb.1769506741.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Server: rspam11 X-Stat-Signature: dy3zrbg8dc5bxwm36ereapkbdbrmib8r X-Rspam-User: X-Rspamd-Queue-Id: EDC7A1A0003 X-HE-Tag: 1769507180-86299 X-HE-Meta: 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 yUWHmwtj GCkiP+uWu1kMBblMCK9j41QzJoTRMyE8n6cmmL/of9qMnsCCFCA3/Mcgf9mz2VgTAGSi0AEFFzumWOeyDV/KTfYhcNkR5vhP2Sx+bilMjSYmPCNtb6QjR2ByLXFmItHJsm+/0cQf/qQuY47LtV8tpPoOeOqb62KfAAwZSmZUeeN4uS1ZQZKvgY8HbkBiZYzBr4UH5fakISrUIoI3zYzSwvJJg0wnjx4N6JbAkoz6R5+fnv7d5O4KuU0KbgXTAvUzmgsCPWz470Z7sA4kGjFuTy0pe8iQIpfDd8FNw2jxGcT0P2SGjQjGbphDerr0AU9PGXH+rJ+nHvGYGvjU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Hui Zhu To support features like allowing overrides in cgroup hierarchies, we need a way to pass flags from userspace to the kernel when attaching a struct_ops. Extend `bpf_struct_ops_link` to include a `flags` field. This field is populated from `attr->link_create.flags` during link creation. This will allow struct_ops implementations, such as the upcoming memory controller ops, to interpret these flags and modify their attachment behavior accordingly. Signed-off-by: Geliang Tang Signed-off-by: Hui Zhu --- include/linux/bpf.h | 1 + kernel/bpf/bpf_struct_ops.c | 1 + tools/include/uapi/linux/bpf.h | 2 +- 3 files changed, 3 insertions(+), 1 deletion(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 720055d1dbce..13c933cfc614 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -1896,6 +1896,7 @@ struct bpf_struct_ops_link { struct bpf_map __rcu *map; wait_queue_head_t wait_hup; u64 cgroup_id; + u32 flags; }; struct bpf_link_primer { diff --git a/kernel/bpf/bpf_struct_ops.c b/kernel/bpf/bpf_struct_ops.c index c807793e7633..0df608c88403 100644 --- a/kernel/bpf/bpf_struct_ops.c +++ b/kernel/bpf/bpf_struct_ops.c @@ -1392,6 +1392,7 @@ int bpf_struct_ops_link_create(union bpf_attr *attr) cgroup_put(cgrp); } #endif /* CONFIG_CGROUPS */ + link->flags = attr->link_create.flags; err = bpf_link_prime(&link->link, &link_primer); if (err) diff --git a/tools/include/uapi/linux/bpf.h b/tools/include/uapi/linux/bpf.h index 3ca7d76e05f0..4e1c5d6d91ae 100644 --- a/tools/include/uapi/linux/bpf.h +++ b/tools/include/uapi/linux/bpf.h @@ -1185,7 +1185,7 @@ enum bpf_perf_event_type { BPF_PERF_EVENT_EVENT = 6, }; -/* cgroup-bpf attach flags used in BPF_PROG_ATTACH command +/* cgroup-bpf attach flags used in BPF_PROG_ATTACH and BPF_LINK_CREATE command * * NONE(default): No further bpf programs allowed in the subtree. * -- 2.43.0