From patchwork Mon Sep 18 21:24:55 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 13390495 X-Patchwork-Delegate: bpf@iogearbox.net 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 B62BB450C7 for ; Mon, 18 Sep 2023 21:25:15 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id AE97FC433CB; Mon, 18 Sep 2023 21:25:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1695072315; bh=qSu52lVu+i6wCur7+lnBObV3hyY33xSbm2eo6taFp5E=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=AW5TczV5DF8UIK5n1KkLKfkyebuTS8bWnT3SJW6hn4jzpo99E7Z53gtP4JDvBL9S+ INF7+QUYcdlfjUPMdhT+7MNduU2OT8JrToeZBum1ANoKbQBZjKtB3Mg7LuxqGz1D/2 gOgnEMsSp8R+oAwHR+zO7qjshi7KsRLP4u6GTW7hazyKFg8EaB44coagBw2a8a9hVI ax9JVMZQiQT01rbnEoBsYModAgKFbdbUG4Sw4QxBUPfCfepTPutx7Dg4zc2nrSCKsQ d2gb1V0O2lnSGdzKZv2gWAbQJykT7tgKDow8IHEibln9OyRXaDlSCipBLr/i1FusSo Daw/9r3iYGmLg== 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 Subject: [PATCH v3 1/5] kernel: Add helper macros for loop unrolling Date: Mon, 18 Sep 2023 23:24:55 +0200 Message-ID: <20230918212459.1937798-2-kpsingh@kernel.org> X-Mailer: git-send-email 2.42.0.459.ge4e396fd5e-goog In-Reply-To: <20230918212459.1937798-1-kpsingh@kernel.org> References: <20230918212459.1937798-1-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; } Signed-off-by: KP Singh Reviewed-by: Kees Cook Reviewed-by: Casey Schaufler Acked-by: Song Liu --- 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 */