From patchwork Thu Sep 28 20:24:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 13403495 X-Patchwork-Delegate: paul@paul-moore.com 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 4570DE743C2 for ; Thu, 28 Sep 2023 20:24:28 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230246AbjI1UY2 (ORCPT ); Thu, 28 Sep 2023 16:24:28 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53358 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230325AbjI1UY1 (ORCPT ); Thu, 28 Sep 2023 16:24:27 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1AC2C180 for ; Thu, 28 Sep 2023 13:24:26 -0700 (PDT) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 0C852C433C8; Thu, 28 Sep 2023 20:24:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695932665; bh=xFLt7v04zqMvc7GvlpAipIRzjXFrz3eROkcu4+kDjw4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ohMUj++JdV+H3esHCPLyQZbCGd6rY2RFrI83nK8yium1KADOY1xf8r2uvWRQdX4Hl Ja63hNPNZWOzqRZi5CD3Ia6egBa+ZcbcLsOATxXBrBsH6gMxhg1181SVYVIOFXIU/x u1S4vT3zjmKKogwVbWZ4CRROJyp6xCNbzpI0pBNndMudh+N7b3LrxylP0SKrz/i4m6 h2n4DVJMrrTlE1BFXJ2ND5OHJMliBFghP+0LAir6fVrLRsvl6HTK9tn0SLjHVeWABZ lR66AgGboshYWkSDJ/16FmVsP9uF4HX4SZfDkug44DJkYKkS26Cnocyjdtt/3hjNIM H4zhemzAH16iw== From: KP Singh To: linux-security-module@vger.kernel.org, bpf@vger.kernel.org Cc: paul@paul-moore.com, keescook@chromium.org, casey@schaufler-ca.com, song@kernel.org, daniel@iogearbox.net, ast@kernel.org, kpsingh@kernel.org, renauld@google.com Subject: [PATCH v5 1/5] kernel: Add helper macros for loop unrolling Date: Thu, 28 Sep 2023 22:24:06 +0200 Message-ID: <20230928202410.3765062-2-kpsingh@kernel.org> X-Mailer: git-send-email 2.42.0.582.g8ccd20d70d-goog In-Reply-To: <20230928202410.3765062-1-kpsingh@kernel.org> References: <20230928202410.3765062-1-kpsingh@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: 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; } Reviewed-by: Kees Cook Reviewed-by: Casey Schaufler Acked-by: Song Liu Signed-off-by: KP Singh --- include/linux/unroll.h | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 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..d42fd6366373 --- /dev/null +++ b/include/linux/unroll.h @@ -0,0 +1,36 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +/* + * Copyright (C) 2023 Google LLC. + */ + +#ifndef __UNROLL_H +#define __UNROLL_H + +#include + +#define UNROLL(N, MACRO, args...) CONCATENATE(__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 */