From patchwork Wed Dec 2 16:12:44 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vitaly Kuznetsov X-Patchwork-Id: 11946369 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=-13.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 1A244C64E7C for ; Wed, 2 Dec 2020 16:13:06 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id 85A892173E for ; Wed, 2 Dec 2020 16:13:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 85A892173E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 0CAD56B005D; Wed, 2 Dec 2020 11:13:05 -0500 (EST) Received: by kanga.kvack.org (Postfix, from userid 40) id 07BCC8D0003; Wed, 2 Dec 2020 11:13:05 -0500 (EST) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id EFF1A8D0002; Wed, 2 Dec 2020 11:13:04 -0500 (EST) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0091.hostedemail.com [216.40.44.91]) by kanga.kvack.org (Postfix) with ESMTP id D70BB6B005D for ; Wed, 2 Dec 2020 11:13:04 -0500 (EST) Received: from smtpin08.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay01.hostedemail.com (Postfix) with ESMTP id 15462180AD801 for ; Wed, 2 Dec 2020 16:13:04 +0000 (UTC) X-FDA: 77548836288.08.soda34_2009fc0273b4 Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin08.hostedemail.com (Postfix) with ESMTP id D5B981819E62A for ; Wed, 2 Dec 2020 16:13:03 +0000 (UTC) X-HE-Tag: soda34_2009fc0273b4 X-Filterd-Recvd-Size: 3204 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [63.128.21.124]) by imf13.hostedemail.com (Postfix) with ESMTP for ; Wed, 2 Dec 2020 16:13:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1606925582; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CaFhXQZtQXCRojqbjwjt4qssxuRxO0wtxwWehTIiNaU=; b=LvFIKl1RIpYKetfpeT3bF9Du7tceAUjVifvhFq4KEb2m2T0WWXvdq8V6mCEKFiWnzahpyj WqqtFp3VYQtjeL/3equgUuyg8h+PoiWLjdt6gckxk8ApzI30lCuq8LquIyWZuo03Yx8h7q st1MKwgrjz2XQsionPf+1TaeWR0juhE= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-292-1xUc7NQWP-yOwR6TKZlV3Q-1; Wed, 02 Dec 2020 11:12:58 -0500 X-MC-Unique: 1xUc7NQWP-yOwR6TKZlV3Q-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 705901006C81; Wed, 2 Dec 2020 16:12:57 +0000 (UTC) Received: from vitty.brq.redhat.com (unknown [10.40.192.18]) by smtp.corp.redhat.com (Postfix) with ESMTP id 709145C1B4; Wed, 2 Dec 2020 16:12:52 +0000 (UTC) From: Vitaly Kuznetsov To: linux-hyperv@vger.kernel.org Cc: Wei Liu , Stephen Hemminger , Haiyang Zhang , Michael Kelley , Dexuan Cui , David Hildenbrand , linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 1/2] hv_balloon: simplify math in alloc_balloon_pages() Date: Wed, 2 Dec 2020 17:12:44 +0100 Message-Id: <20201202161245.2406143-2-vkuznets@redhat.com> In-Reply-To: <20201202161245.2406143-1-vkuznets@redhat.com> References: <20201202161245.2406143-1-vkuznets@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: 'alloc_unit' in alloc_balloon_pages() is either '512' for 2M allocations or '1' for 4k allocations. So 1 << get_order(alloc_unit << PAGE_SHIFT) equals to 'alloc_unit' and the for loop basically sets all them offline. Simplify the math to improve the readability. Signed-off-by: Vitaly Kuznetsov Reviewed-by: David Hildenbrand --- drivers/hv/hv_balloon.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/hv/hv_balloon.c b/drivers/hv/hv_balloon.c index eb56e09ae15f..da3b6bd2367c 100644 --- a/drivers/hv/hv_balloon.c +++ b/drivers/hv/hv_balloon.c @@ -1238,7 +1238,7 @@ static unsigned int alloc_balloon_pages(struct hv_dynmem_device *dm, split_page(pg, get_order(alloc_unit << PAGE_SHIFT)); /* mark all pages offline */ - for (j = 0; j < (1 << get_order(alloc_unit << PAGE_SHIFT)); j++) + for (j = 0; j < alloc_unit; j++) __SetPageOffline(pg + j); bl_resp->range_count++;