From patchwork Wed Jul 10 00:04:58 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 13728637 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id D3BA410FF; Wed, 10 Jul 2024 00:05:31 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720569931; cv=none; b=eUqVNFLm4EouUMwc/oO1PABr+dBNJ/IlD9zWIeRLGLWQJbXktlC0th7ifiqe3mFsHlH9lqS551RoIfo7TkGtA/5sa3j8iFC0LJupRWNcIU1h67IPs41lx6P8ZE3++fGTBN6oaFg3M75MgVbtDcOAzDYF9cDdISJxYC9ULsPZhr8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720569931; c=relaxed/simple; bh=hzkTRNL0yH8hJQz0aQmeB/BDH18/T05HKiqAEZXYhFE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=TN4Y4N96nkzXTspYYVAPL40qa4XmtfbWqkKBRsTOiJV4d4grJCW8N6VgQhtepixahPEzg+HVauJ0Aq3jBCkXlbZWsYPC4PDqaM9ADw/bg13naoGnojGUoKWufZiWmrN0ddtAPdt9rTDY9sTnNxCY5YiGZv5JFUAaiPkLgilxPkE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ImhkUPoM; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ImhkUPoM" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 51274C32786; Wed, 10 Jul 2024 00:05:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1720569931; bh=hzkTRNL0yH8hJQz0aQmeB/BDH18/T05HKiqAEZXYhFE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ImhkUPoMw1JnwEYSQU4mn4/Yedssvr6FmAGuGtbvv3YDk/vwFr6jNStvPcBL+9uQ5 k8T+e2X1SavzkoK4Z/+y+FTjq5r27sVgpsXk8xYLhg5FLPxXOnyCUyPq+9uwd5KroB GO8/LAhvwnFmzqanGegU+teUTXDlCzv2+IqHrdNL89qcX419zOc2MW3J+23F/UD0eJ Fo0mJp1MWL0RG2Ha5VBEuD2ab3tNHxY1pYby8e4vvi+sUilIxyEjsiZg27T6Cu2vv7 L9nTH3hR4/5tJynuQB9Y46j8tdlC/yQetgsSKGPQ42YygztTSjhK5Jv38Xl1yb7z48 JD1FiQchD9ugw== From: KP Singh To: linux-security-module@vger.kernel.org, bpf@vger.kernel.org Cc: ast@kernel.org, paul@paul-moore.com, casey@schaufler-ca.com, andrii@kernel.org, keescook@chromium.org, daniel@iogearbox.net, renauld@google.com, revest@chromium.org, song@kernel.org, KP Singh Subject: [PATCH v14 1/3] kernel: Add helper macros for loop unrolling Date: Wed, 10 Jul 2024 02:04:58 +0200 Message-ID: <20240710000500.208154-2-kpsingh@kernel.org> X-Mailer: git-send-email 2.45.2.803.g4e1b14247a-goog In-Reply-To: <20240710000500.208154-1-kpsingh@kernel.org> References: <20240710000500.208154-1-kpsingh@kernel.org> Precedence: bulk X-Mailing-List: bpf@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 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 Acked-by: Andrii Nakryiko 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 */