From patchwork Tue Apr 6 22:10:58 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: =?utf-8?q?Marek_Beh=C3=BAn?= X-Patchwork-Id: 416281 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37E55C433ED for ; Tue, 6 Apr 2021 22:12:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E2D3D613DF for ; Tue, 6 Apr 2021 22:12:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1344069AbhDFWMM (ORCPT ); Tue, 6 Apr 2021 18:12:12 -0400 Received: from mail.kernel.org ([198.145.29.99]:52612 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S243688AbhDFWMI (ORCPT ); Tue, 6 Apr 2021 18:12:08 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C6B6A613CF; Tue, 6 Apr 2021 22:11:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1617747120; bh=024eEXW6rUm55DFWDo7bYXYV3B9uGF+OotVDi1OOyw0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bbSl9mFkXCsB8dy8iv1Q9wWTLkcdNAIY0PycXWrJZUPi80dFlKwncxK1ROVIPEVEG VYFYF9v/7+HMC+9ma1YqZEC7zec0jCuc+WU0XOoVL9nO1UkQCaG1XJJ13gWmup9hl6 bojskzaz2QinRc4Ww/BH6jqbjAAn1qAy5eeeKx6Hn+xrFAUqC82+8RoodSJ3hmZ1/p CR5kt45gY7mOCdF5AHmhfdTztCRySpWMlCeusvAzxpPpALkV9ayRWTFjoz2tXJfpCI Gy8cAzW3uS5UWLNdJD15WNt8Q7cVbcouVWgEteFQ9OXNa2diBeoLKh0soLi4ySxdA7 rTpQAcA9C/FfA== From: =?utf-8?q?Marek_Beh=C3=BAn?= To: netdev@vger.kernel.org, Russell King Cc: "David S . Miller" , Florian Fainelli , Heiner Kallweit , kuba@kernel.org, =?utf-8?q?Marek_Beh=C3=BAn?= Subject: [PATCH net-next v3 09/18] include: bitmap: add macro for bitmap initialization Date: Wed, 7 Apr 2021 00:10:58 +0200 Message-Id: <20210406221107.1004-10-kabel@kernel.org> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210406221107.1004-1-kabel@kernel.org> References: <20210406221107.1004-1-kabel@kernel.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org Use the new variadic-macro.h library to implement macro INITIALIZE_BITMAP(nbits, ...), which can be used for compile time bitmap initialization in the form static DECLARE_BITMAP(bm, 100) = INITIALIZE_BITMAP(100, 7, 9, 66, 98); The macro uses the BUILD_BUG_ON_ZERO mechanism to ensure a compile-time error if an argument is out of range. Signed-off-by: Marek Behún --- include/linux/bitmap.h | 24 ++++++++++++++++++++++++ 1 file changed, 24 insertions(+) diff --git a/include/linux/bitmap.h b/include/linux/bitmap.h index 70a932470b2d..a9e74d3420bf 100644 --- a/include/linux/bitmap.h +++ b/include/linux/bitmap.h @@ -8,6 +8,7 @@ #include #include #include +#include /* * bitmaps provide bit arrays that consume one or more unsigned @@ -114,6 +115,29 @@ * contain all bit positions from 0 to 'bits' - 1. */ +/** + * DOC: initialize bitmap + * The INITIALIZE_BITMAP(bits, args...) macro expands to a designated + * initializer for bitmap of length 'bits', setting each bit specified + * in 'args...'. + */ +#define _BIT_MEMBER(bit) ((bit) / BITS_PER_LONG) +#define _VERIFY_BIT(bit, nbits) \ + BUILD_BUG_ON_ZERO((bit) < 0 || (bit) >= (nbits)) +#define _INIT_BITMAP_MEMBER_VALUE(bit, member_bit) \ + | (_BIT_MEMBER(bit) == _BIT_MEMBER(member_bit) \ + ? BIT((bit) % BITS_PER_LONG) \ + : 0) +#define _INIT_BITMAP_MEMBER(bit, nbits, ...) \ + [_VERIFY_BIT((bit), (nbits)) + _BIT_MEMBER(bit)] = \ + (0 EXPAND_FOR_EACH(_INIT_BITMAP_MEMBER_VALUE, \ + (bit), ##__VA_ARGS__)), +#define INITIALIZE_BITMAP(nbits, ...) \ + { \ + EXPAND_FOR_EACH_PASS_ARGS(_INIT_BITMAP_MEMBER, (nbits), \ + ##__VA_ARGS__) \ + } + /* * Allocation and deallocation of bitmap. * Provided in lib/bitmap.c to avoid circular dependency.