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 F0092C88E78 for ; Mon, 26 Jan 2026 09:05:50 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 656106B0092; Mon, 26 Jan 2026 04:05:50 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 60DDB6B0095; Mon, 26 Jan 2026 04:05:50 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 52D206B0096; Mon, 26 Jan 2026 04:05:50 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 4247C6B0092 for ; Mon, 26 Jan 2026 04:05:50 -0500 (EST) Received: from smtpin07.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id CB8B58C3A7 for ; Mon, 26 Jan 2026 09:05:49 +0000 (UTC) X-FDA: 84373532418.07.F3129C8 Received: from out-180.mta0.migadu.com (out-180.mta0.migadu.com [91.218.175.180]) by imf05.hostedemail.com (Postfix) with ESMTP id 2670B100003 for ; Mon, 26 Jan 2026 09:05:47 +0000 (UTC) Authentication-Results: imf05.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=w4Gy5WcZ; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf05.hostedemail.com: domain of hui.zhu@linux.dev designates 91.218.175.180 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1769418348; 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=scw1Zt96lGhx6TgYLJCrD3KnmWe6+fD34WksgLGp60v+SyIVMILqANH9aJmcF8lpwq+qbt vMVKn+zmOaSbgWA2qb4CFifBXwZMIL2KULv3s/BlhEJlWrZEdnG35cGQCOxu/dBBb5OVGo EvAAcnB+l0tEPqQALs//Up54K2APWEI= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1769418348; a=rsa-sha256; cv=none; b=bq/9uowMhZHEf753LEpuQ2xkP4gfkeJsfnNG/frHpx88tLK/wtjpvIScvlc9uUzcuT3wCW ungrdNjHKJBsgVPumjKSee+Nlizy97nMMvnPQSdYpjqEg2WYFJp7IAFWbmJuqeAgZzRBQr dU0QvTbTisDgNDQ/+IIMJ2zlJd5kJ3w= ARC-Authentication-Results: i=1; imf05.hostedemail.com; dkim=pass header.d=linux.dev header.s=key1 header.b=w4Gy5WcZ; dmarc=pass (policy=none) header.from=linux.dev; spf=pass (imf05.hostedemail.com: domain of hui.zhu@linux.dev designates 91.218.175.180 as permitted sender) smtp.mailfrom=hui.zhu@linux.dev 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=1769418346; 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=w4Gy5WcZtlDZYkEO2TO4A9miXEi+bQ9j+mJmKZdHyxjM/yyMcz17Hm145nGY64rLCBLjEZ OaItV++yLzC5YIxcjk5+oVLXZKp0JTibbA0TJipVv9n5lFyJwMExVco1S5jtLB8/LsxqW7 xJQRKPMULmQa2T7sm/1Q/DaH5knBswc= 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 v4 06/12] bpf: Pass flags in bpf_link_create for struct_ops Date: Mon, 26 Jan 2026 17:04:49 +0800 Message-ID: <6b2d4fa8e5209d363f553d7851d5a1156137d9fb.1769417588.git.zhuhui@kylinos.cn> In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspamd-Queue-Id: 2670B100003 X-Stat-Signature: of8y71u66qett7iuh8i8o3txdkhp396b X-Rspam-User: X-Rspamd-Server: rspam02 X-HE-Tag: 1769418347-315678 X-HE-Meta: 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 PNi3/UVO EZkowJbpy/B0tbqO5j+HtiSYyWhrIkvT1lBElmlIf0BCEKj8xRgmdIn1I+GMj80cDpv/z7p+MWLdTSrh0rQEyRTI5qPs1gdtLkKAAQiJpyV+1Rs5effOAlAKfhsBjszR8T4qkUKZkP7b2yG4pZ7Nfh5spRpOhVjv9Y8e8vgFoqqXg0g5u3equkvLTllqNGhF8LX7NR2Is4YInbPNU8ex7/G8wCiHFngHuOTTTi2Ul8D+1B0oZWyEy6uEWFYYOXThYOFa3NOhNzPcJ5AqAS9DBUKdVGQbnnQGJ7ohXlFgvAb/LPyXD9p8XXCAAPk4X8IMy007b8idI7rysRKkJeNtj/topug== 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