From mboxrd@z Thu Jan 1 00:00:00 1970 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=-13.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,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 EE51EC433E0 for ; Wed, 5 Aug 2020 00:11:24 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C602820738 for ; Wed, 5 Aug 2020 00:11:24 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596586284; bh=2xIrVg64kndWbqniUMgYzth4/meHGaDYEbL6L9UyYO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=P9SXZz9MkXtoGnFS1ZhxNqcTIgyqWJP7f4VceROa89SyQWUu/b2AX6KL0bdo1KYlD gIR2bA1rkixFwvevBjhNhqil5EW4NjHFPoQH5/8G0yR1vyCuUacN3Oj8MFisExALH3 8h4iOO+6Kiv/5V9cAiJG0WzSKp0JoYAkTInrebEY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728325AbgHEALW (ORCPT ); Tue, 4 Aug 2020 20:11:22 -0400 Received: from mail.kernel.org ([198.145.29.99]:46942 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728013AbgHEAKv (ORCPT ); Tue, 4 Aug 2020 20:10:51 -0400 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id C0B2922CF6; Wed, 5 Aug 2020 00:10:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1596586251; bh=2xIrVg64kndWbqniUMgYzth4/meHGaDYEbL6L9UyYO0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TQ7kVXK+TQYlwHTzyyFT2TurCPbvbzY4ohwEkjlu9xAr3luzSui9Apx9Q38Sia/t5 E0mIUP3WIBxRQ586b+3KnrvIbYXgEpURbIZtg/iCi6dYjg1BF3Lw+LVK6WwGjB3HpR VUIclImyJNnLF2PIm7NywikLcPlyDdVJOo4fONXM= From: Sasha Levin To: torvalds@linux-foundation.org Cc: mingo@kernel.org, peterz@infradead.org, linux-kernel@vger.kernel.org, Sasha Levin Subject: [PATCH v4 06/14] tools bitmap: add bitmap_clear definition Date: Tue, 4 Aug 2020 20:10:35 -0400 Message-Id: <20200805001043.3331907-7-sashal@kernel.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200805001043.3331907-1-sashal@kernel.org> References: <20200805001043.3331907-1-sashal@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is needed as a result of de4643a77356 ("locking/lockdep: Reuse lock chains that have been freed"). Signed-off-by: Sasha Levin --- tools/lib/bitmap.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) diff --git a/tools/lib/bitmap.c b/tools/lib/bitmap.c index b6bc037623fc1..873176c501e43 100644 --- a/tools/lib/bitmap.c +++ b/tools/lib/bitmap.c @@ -101,3 +101,23 @@ int __bitmap_andnot(unsigned long *dst, const unsigned long *bitmap1, BITMAP_LAST_WORD_MASK(bits)); return result != 0; } + +void bitmap_clear(unsigned long *map, unsigned int start, int len) +{ + unsigned long *p = map + BIT_WORD(start); + const unsigned int size = start + len; + int bits_to_clear = BITS_PER_LONG - (start % BITS_PER_LONG); + unsigned long mask_to_clear = BITMAP_FIRST_WORD_MASK(start); + + while (len - bits_to_clear >= 0) { + *p &= ~mask_to_clear; + len -= bits_to_clear; + bits_to_clear = BITS_PER_LONG; + mask_to_clear = ~0UL; + p++; + } + if (len) { + mask_to_clear &= BITMAP_LAST_WORD_MASK(size); + *p &= ~mask_to_clear; + } +} -- 2.25.1