From patchwork Thu May 16 00:35:20 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 13665622 X-Patchwork-Delegate: paul@paul-moore.com 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 2E6B810E6; Thu, 16 May 2024 00:35:35 +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=1715819735; cv=none; b=tShZ2MrUtfBml5qWU55l2GO4svsjjzTS2TiUBEhylYoIx+GbQZOg9KWWi4ETePGO3Dm+v9JNorzhFUsjcGkSh/HG9ccOtCdmIrUZSTdoXgEn8BLwAesoSaNJPYsYDlH5wVXr+X7LIGGSqfpxz1fQ1YVbEtOF6mUgSeLBnqmk2AM= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715819735; c=relaxed/simple; bh=K+lADN8+8te0U6GGFL5Z7aSuGApQDoMThtNo4JVVGeI=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=fW01ENifL5qulFqBt9/H9ePBfwhAXBYRW+IcD96PgCCbBdmCnUNZZ7XRPjErRx9TwhOwhQGmdInz7yUCm0ut0riQkLXoImbTVMqSNo/Tscd8bYWbbpv839XQscjnG5h94c634RllIa8qUcHrCqK9QC4j8D8nexlqk6lNrBgmiEs= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=pXzrA39B; 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="pXzrA39B" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CED30C116B1; Thu, 16 May 2024 00:35:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1715819735; bh=K+lADN8+8te0U6GGFL5Z7aSuGApQDoMThtNo4JVVGeI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=pXzrA39BYoDUcBdwhe9qkMo9gvbb0vIcNx8wamVUjn7a+YDOXBkkMIZi2SNoa+FB/ VK+3H1LEdxs9w9SEx4qLES+dTdWHEenEyinYeJJegN+fv6Std9yg5HiztGBP6el+01 dptbvt1cwBuA+vWcoQ75YgGvxZj23+vdN3oaVhux8YZwtjlWITw0FCBPIEIqcVqGf6 mwcsbV40id683Fur8cABEGIP5ZHVXVD00kXRGM7/F3XRyp7fPY32+mM/aP1AG7rMIw x1Fgbhe34rIW+mbupB1+gqEYnjFaiDiTgldRECd91PZvIJ4/csmx8FytNSPhGCS3Dn FMp95dJZ81HQw== 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 v12 1/5] kernel: Add helper macros for loop unrolling Date: Thu, 16 May 2024 02:35:20 +0200 Message-ID: <20240516003524.143243-2-kpsingh@kernel.org> X-Mailer: git-send-email 2.45.0.rc1.225.g2a3ae87e7f-goog In-Reply-To: <20240516003524.143243-1-kpsingh@kernel.org> References: <20240516003524.143243-1-kpsingh@kernel.org> Precedence: bulk X-Mailing-List: linux-security-module@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 Reviewed-by: John Johansen --- 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 */