From patchwork Fri Aug 16 15:43:05 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: KP Singh X-Patchwork-Id: 13766550 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 AD64E1DDF5; Fri, 16 Aug 2024 15:43:19 +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=1723822999; cv=none; b=t0vDQoeZHmsZn6fUkEv++A4oo93O6jELhg9ulrWhmPy2MlHgp0XoE8LnlSBAU/+ZagF0qDgyGLFH43tSR888lHXzjA9Q2ZC2olp8I7xOegZp5PagJI0DOSEKArtgr+VaoIeLTf7VZ7l2hWKPxtL0orjphh27aMot/uaXpcNFcc4= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1723822999; c=relaxed/simple; bh=gkHKJ6+O9qLHoIjPXdpksK/5I3sTqS1eYEbUo8mBPc4=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QK5UO3On/uIqZ656CFoq+/7iTEjzz0o4zW6Nufx5sEgVNNdkwwdQ6yrkPsePkiz4ZC6lzyuldOpROLKfyPKoiUk8kiUBLAeoe3Q4HqDr4lx9UFc5yEbBUMMtPBhq4nML8sqOLaswWZvgu3lS8pBA9gID0EEBPDp5Uv1vaFW+J3g= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=psvhwozs; 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="psvhwozs" Received: by smtp.kernel.org (Postfix) with ESMTPSA id A4C54C32782; Fri, 16 Aug 2024 15:43:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1723822999; bh=gkHKJ6+O9qLHoIjPXdpksK/5I3sTqS1eYEbUo8mBPc4=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=psvhwozs74dA2nt5FK5TkDFCCD+ha7iiBatFqBL/mGT7Z12GmA6mcJm/hbiLEBme7 C5cu00B5GTgpqqFPAor9fcmfYlnGQtSkvmDPPHe+h9+MslmI5zQjh4ZpjWFSVOI/TV 1Ww5nixBjf4JWVDABNwnvW8aKHBkXpNfgVn5VqGPPrLpqCmMsrp2PrsfjYfcqtpe0H aAIGOD3NAAsv7ip0giXmnNQRXZju3DkyyB+/YFQWz0yogdqlrTWIoF9ofQrnTvq55+ BlA1aJPrfmYgeDP/gHObnDfdv+o3lpL6wltJGCZwKCij1C90hjiRxhwjczTize+nwh 3VQq2gvsHpeUg== 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, linux@roeck-us.net, KP Singh , John Johansen , Jiri Olsa Subject: [PATCH v15 2/4] kernel: Add helper macros for loop unrolling Date: Fri, 16 Aug 2024 17:43:05 +0200 Message-ID: <20240816154307.3031838-3-kpsingh@kernel.org> X-Mailer: git-send-email 2.46.0.184.g6999bdac58-goog In-Reply-To: <20240816154307.3031838-1-kpsingh@kernel.org> References: <20240816154307.3031838-1-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 Reviewed-by: John Johansen Acked-by: Jiri Olsa Signed-off-by: Paul Moore --- 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 */