From patchwork Fri May 24 22:30:32 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kui-Feng Lee X-Patchwork-Id: 13673772 X-Patchwork-Delegate: bpf@iogearbox.net Received: from mail-yw1-f170.google.com (mail-yw1-f170.google.com [209.85.128.170]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id A419D128808 for ; Fri, 24 May 2024 22:30:45 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716589847; cv=none; b=jp/FDsaq7VcNOtBBf6LLZiLjhtVZI+2quPv/Uc8iBrmnq8A8P6BKTc41SinmrCbN46nShGtILkyRgiOlYan/EKuEgHiDJEfktIqttxBSrYR1rDL8DjQJ3tkkAr/t7QSO5IhDClQ2E9t8V3IYR65qLogJLyfa2m+FMoEpLmVEQms= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1716589847; c=relaxed/simple; bh=pqzVqwQ++8qd6amXfFidlSgABpQlHOg/9TLDkfHrsJk=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=JfZfkvXPVDwMTqKFqulVA+evrNhXkTodtQXFaC9XJuqdn5MmsmLjqc5SmwEVDq/2bDj+ApNqUDvmRLsnNQSkb5Mg9BMxDFLjz4qigpP4e5T+XSktSoUEczNDfdsOv/nuk/E1V7ft5hh8pNT6Zhhg2CtiJnrs8Yp8kAqczisVbnM= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com; spf=pass smtp.mailfrom=gmail.com; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b=iwDKdfuD; arc=none smtp.client-ip=209.85.128.170 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gmail.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="iwDKdfuD" Received: by mail-yw1-f170.google.com with SMTP id 00721157ae682-62a0849f8e5so13785827b3.2 for ; Fri, 24 May 2024 15:30:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20230601; t=1716589844; x=1717194644; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=404ZgiGbr0O6+NfupkiGmQYModIgXFWM0DgrDzRNv/s=; b=iwDKdfuDJ3xAOEtYLmwMdFYHkrK+cCiOdHdMSPh418JbT0/wEFWyB9bgWyaQbb03HG uaaiecYzsr5dw6lwq+LbErnAAkiw+fqLK2CI0TbhfSHDDObw402S4m+huXXLPFE69jBX imGGqIFvZMA3MoZUbjZTXps6q94Ew9DLQ0ALdre4DoYYhhWYn2Lba7Rwld4gS1g/MITr ctkBJLSpq10JDA4rAQh7gpTMqb+MMCbOazwg7hU6UgXW4KZs2xxBIVm1YhPBEGRZj9OT kShtkyc1fbiW3rC5YO/0pSf1GdekVcSPoGN+O69PqQ4ZcHOOnm0FL0gcOC9vorC+RmjO hhqA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1716589844; x=1717194644; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=404ZgiGbr0O6+NfupkiGmQYModIgXFWM0DgrDzRNv/s=; b=Gp3w1yUsYjLHhJ9h0c5iNPFq6X6EIA/SVycQjRIGD60ABui4KVujxw0saNXq7Wb23B QZluFajsv3KRyW4IycPVoIVLqdBhzTFK702tjrgoZmR8W7eLggiSin3Z2iarqChPseHH O+KzJmzdOAmKNyJT+oWB8DJbgmVrkzfuVAasU0x7yQ8RQyPHBsJEKqYVbzKqpRZYCXio nflmMHFJO7dSwZm0HXqG//OxTnSuRuIe2JhUVEFSKKB2eMwXYDpgcRfr8t8BkUlcmlXq gBhfxkvcyogJVWmW9DM64OlCudlzZjGRkhP9Zf9FeD3vDXJhyILe12t+2bLoYShzL3bn ZWJA== X-Gm-Message-State: AOJu0YxExqJJNMZPTbWqe8yakmG44EJpem6+mqISHjsjqpvbIPZifpcW J8WRIgVrO5QDvLi3T+deTzbYwWiy7tTTQuHlMJplCl7yQv7uZ4Jzjx35LA== X-Google-Smtp-Source: AGHT+IGzUxGG+1n1fAaspOGsrVwE9by+wFZgf2otRFq0eaBHB48WcLUM5HEti342e8/x7wtzAzT1Hw== X-Received: by 2002:a0d:dfc8:0:b0:615:225e:ac13 with SMTP id 00721157ae682-62a08d8735amr38121407b3.18.1716589844381; Fri, 24 May 2024 15:30:44 -0700 (PDT) Received: from kickker.attlocal.net ([2600:1700:6cf8:1240:6aeb:e91b:f49d:e77d]) by smtp.gmail.com with ESMTPSA id 00721157ae682-62a0a3bfa19sm4169987b3.44.2024.05.24.15.30.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 24 May 2024 15:30:44 -0700 (PDT) From: Kui-Feng Lee To: bpf@vger.kernel.org, ast@kernel.org, martin.lau@linux.dev, song@kernel.org, kernel-team@meta.com, andrii@kernel.org Cc: sinquersw@gmail.com, kuifeng@meta.com, Kui-Feng Lee Subject: [PATCH bpf-next v6 4/8] bpf: export bpf_link_inc_not_zero. Date: Fri, 24 May 2024 15:30:32 -0700 Message-Id: <20240524223036.318800-5-thinker.li@gmail.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240524223036.318800-1-thinker.li@gmail.com> References: <20240524223036.318800-1-thinker.li@gmail.com> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Delegate: bpf@iogearbox.net bpf_link_inc_not_zero() will be used by kernel modules. We will use it in bpf_testmod.c later. Signed-off-by: Kui-Feng Lee --- include/linux/bpf.h | 6 ++++++ kernel/bpf/syscall.c | 3 ++- 2 files changed, 8 insertions(+), 1 deletion(-) diff --git a/include/linux/bpf.h b/include/linux/bpf.h index 5f7496ef8b7c..6b592094f9b4 100644 --- a/include/linux/bpf.h +++ b/include/linux/bpf.h @@ -2351,6 +2351,7 @@ int bpf_link_prime(struct bpf_link *link, struct bpf_link_primer *primer); int bpf_link_settle(struct bpf_link_primer *primer); void bpf_link_cleanup(struct bpf_link_primer *primer); void bpf_link_inc(struct bpf_link *link); +struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link); void bpf_link_put(struct bpf_link *link); int bpf_link_new_fd(struct bpf_link *link); struct bpf_link *bpf_link_get_from_fd(u32 ufd); @@ -2722,6 +2723,11 @@ static inline void bpf_link_inc(struct bpf_link *link) { } +static inline struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link) +{ + return NULL; +} + static inline void bpf_link_put(struct bpf_link *link) { } diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c index 741f91153fe6..0d59de63540d 100644 --- a/kernel/bpf/syscall.c +++ b/kernel/bpf/syscall.c @@ -5432,10 +5432,11 @@ static int link_detach(union bpf_attr *attr) return ret; } -static struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link) +struct bpf_link *bpf_link_inc_not_zero(struct bpf_link *link) { return atomic64_fetch_add_unless(&link->refcnt, 1, 0) ? link : ERR_PTR(-ENOENT); } +EXPORT_SYMBOL(bpf_link_inc_not_zero); struct bpf_link *bpf_link_by_id(u32 id) {