From patchwork Thu Jan 19 23:10:30 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 13109164 X-Patchwork-Delegate: bpf@iogearbox.net 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5A3CBC38159 for ; Fri, 20 Jan 2023 05:19:57 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230446AbjATFTz (ORCPT ); Fri, 20 Jan 2023 00:19:55 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53496 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231352AbjATFTi (ORCPT ); Fri, 20 Jan 2023 00:19:38 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 59C064210; Thu, 19 Jan 2023 21:09:07 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id E90D1B8270D; Thu, 19 Jan 2023 23:10:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 52DA7C433EF; Thu, 19 Jan 2023 23:10:40 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1674169842; bh=ZII5T8PW4jDZyBdwaPUuY/oi4AIqimsLvi34L121owk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ne422n0rDtm1pG7fwpzv4wjU7b/X9P2YYdh83qcl1uYZ7oi28iP2qgHJfl8AtqpqD +1cQVoqKMFEzqtMkqrJ7RcKhyFvw9C4DY8sH3dRZofH2cbZvHQYpLQZNrZvW9go2kY IAdexrH1AwAeFYEK7G9djJYPb3mR4MvsGuEH1JuZVHzQO1TtMoRfmOXZFC2KVFJdbF +zF25AaBL9EmkQBcKNNbCzF5DaqxQtShExyFSCQZ5wUcrPHZj7unUYKrWiGgcwC6fN Ug0XvNkWXc8q9HZg6zr+LXGaQLj+Q7r80gS/Iif95oEnLq16L9t5zwJWorxQHaS8Zh GSKjSaC1B/1Vg== From: KP Singh To: linux-security-module@vger.kernel.org, bpf@vger.kernel.org Cc: ast@kernel.org, daniel@iogearbox.net, jackmanb@google.com, renauld@google.com, paul@paul-moore.com, casey@schaufler-ca.com, song@kernel.org, revest@chromium.org, keescook@chromium.org, KP Singh Subject: [PATCH bpf-next 1/4] kernel: Add helper macros for loop unrolling Date: Fri, 20 Jan 2023 00:10:30 +0100 Message-Id: <20230119231033.1307221-2-kpsingh@kernel.org> X-Mailer: git-send-email 2.39.0.246.g2a6d74b583-goog In-Reply-To: <20230119231033.1307221-1-kpsingh@kernel.org> References: <20230119231033.1307221-1-kpsingh@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org X-Patchwork-Delegate: bpf@iogearbox.net This helps in easily initializing blocks of code (e.g. static calls and keys). UNROLL(N, MACRO, __VA_ARGS__) calls MACRO N times with the first argument as the index of the iteration. This allows string pasting to create unique tokens for variable names, function calls etc. As an example: #include #define MACRO(N, a, b) \ int add_##N(int a, int b) \ { \ return a + b + N; \ } UNROLL(2, MACRO, x, y) expands to: int add_0(int x, int y) { return x + y + 0; } int add_1(int x, int y) { return x + y + 1; } Signed-off-by: KP Singh --- include/linux/unroll.h | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) create mode 100644 include/linux/unroll.h diff --git a/include/linux/unroll.h b/include/linux/unroll.h new file mode 100644 index 000000000000..e19aef95b94b --- /dev/null +++ b/include/linux/unroll.h @@ -0,0 +1,35 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * Copyright (C) 2020 Google LLC. + */ + +#ifndef __UNROLL_H +#define __UNROLL_H + +#define __UNROLL_CONCAT(a, b) a ## _ ## b +#define UNROLL(N, MACRO, args...) __UNROLL_CONCAT(__UNROLL, N)(MACRO, args) + +#define __UNROLL_0(MACRO, args...) +#define __UNROLL_1(MACRO, args...) __UNROLL_0(MACRO, args) MACRO(0, args) +#define __UNROLL_2(MACRO, args...) __UNROLL_1(MACRO, args) MACRO(1, args) +#define __UNROLL_3(MACRO, args...) __UNROLL_2(MACRO, args) MACRO(2, args) +#define __UNROLL_4(MACRO, args...) __UNROLL_3(MACRO, args) MACRO(3, args) +#define __UNROLL_5(MACRO, args...) __UNROLL_4(MACRO, args) MACRO(4, args) +#define __UNROLL_6(MACRO, args...) __UNROLL_5(MACRO, args) MACRO(5, args) +#define __UNROLL_7(MACRO, args...) __UNROLL_6(MACRO, args) MACRO(6, args) +#define __UNROLL_8(MACRO, args...) __UNROLL_7(MACRO, args) MACRO(7, args) +#define __UNROLL_9(MACRO, args...) __UNROLL_8(MACRO, args) MACRO(8, args) +#define __UNROLL_10(MACRO, args...) __UNROLL_9(MACRO, args) MACRO(9, args) +#define __UNROLL_11(MACRO, args...) __UNROLL_10(MACRO, args) MACRO(10, args) +#define __UNROLL_12(MACRO, args...) __UNROLL_11(MACRO, args) MACRO(11, args) +#define __UNROLL_13(MACRO, args...) __UNROLL_12(MACRO, args) MACRO(12, args) +#define __UNROLL_14(MACRO, args...) __UNROLL_13(MACRO, args) MACRO(13, args) +#define __UNROLL_15(MACRO, args...) __UNROLL_14(MACRO, args) MACRO(14, args) +#define __UNROLL_16(MACRO, args...) __UNROLL_15(MACRO, args) MACRO(15, args) +#define __UNROLL_17(MACRO, args...) __UNROLL_16(MACRO, args) MACRO(16, args) +#define __UNROLL_18(MACRO, args...) __UNROLL_17(MACRO, args) MACRO(17, args) +#define __UNROLL_19(MACRO, args...) __UNROLL_18(MACRO, args) MACRO(18, args) +#define __UNROLL_20(MACRO, args...) __UNROLL_19(MACRO, args) MACRO(19, args) + +#endif /* __UNROLL_H */