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=-8.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_PASS,URIBL_BLOCKED, 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 85A4EECE563 for ; Tue, 18 Sep 2018 06:41:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4A78F206B7 for ; Tue, 18 Sep 2018 06:41:04 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 4A78F206B7 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=vmware.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729356AbeIRMLh (ORCPT ); Tue, 18 Sep 2018 08:11:37 -0400 Received: from ex13-edg-ou-002.vmware.com ([208.91.0.190]:36971 "EHLO EX13-EDG-OU-002.vmware.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729295AbeIRMLg (ORCPT ); Tue, 18 Sep 2018 08:11:36 -0400 Received: from sc9-mailhost3.vmware.com (10.113.161.73) by EX13-EDG-OU-002.vmware.com (10.113.208.156) with Microsoft SMTP Server id 15.0.1156.6; Mon, 17 Sep 2018 23:39:56 -0700 Received: from sc2-haas01-esx0118.eng.vmware.com (sc2-haas01-esx0118.eng.vmware.com [10.172.44.118]) by sc9-mailhost3.vmware.com (Postfix) with ESMTP id D4AEA40957; Mon, 17 Sep 2018 23:40:19 -0700 (PDT) From: Nadav Amit To: Arnd Bergmann , Greg Kroah-Hartman CC: , Nadav Amit Subject: [PATCH 09/19] vmw_balloon: simplify vmballoon_send_get_target() Date: Mon, 17 Sep 2018 23:38:43 -0700 Message-ID: <20180918063853.198332-10-namit@vmware.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20180918063853.198332-1-namit@vmware.com> References: <20180918063853.198332-1-namit@vmware.com> MIME-Version: 1.0 Content-Type: text/plain Received-SPF: None (EX13-EDG-OU-002.vmware.com: namit@vmware.com does not designate permitted sender hosts) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As we want to leave as little as possible on the global balloon structure, to avoid possible future races, we want to get rid sysinfo. We can actually get the total_ram directly, and simplify the logic of vmballoon_send_get_target() a little. While we are doing that, let's return int and avoid mistakes due to bool/int conversions. Reviewed-by: Xavier Deguillard Signed-off-by: Nadav Amit --- drivers/misc/vmw_balloon.c | 35 ++++++++++++++--------------------- 1 file changed, 14 insertions(+), 21 deletions(-) diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c index aafd087809e9..17ac066a20fe 100644 --- a/drivers/misc/vmw_balloon.c +++ b/drivers/misc/vmw_balloon.c @@ -223,8 +223,6 @@ struct vmballoon { struct dentry *dbg_entry; #endif - struct sysinfo sysinfo; - struct delayed_work dwork; struct vmci_handle vmci_doorbell; @@ -353,34 +351,29 @@ static u16 vmballoon_page_size(bool is_2m_page) return 1; } -/* - * Retrieve desired balloon size from the host. +/** + * vmballoon_send_get_target() - Retrieve desired balloon size from the host. + * + * @b: pointer to the balloon. + * + * Return: zero on success, EINVAL if limit does not fit in 32-bit, as required + * by the host-guest protocol and EIO if an error occurred in communicating with + * the host. */ -static bool vmballoon_send_get_target(struct vmballoon *b) +static int vmballoon_send_get_target(struct vmballoon *b) { unsigned long status; unsigned long limit; - u32 limit32; - /* - * si_meminfo() is cheap. Moreover, we want to provide dynamic - * max balloon size later. So let us call si_meminfo() every - * iteration. - */ - si_meminfo(&b->sysinfo); - limit = b->sysinfo.totalram; + limit = totalram_pages; /* Ensure limit fits in 32-bits */ - limit32 = (u32)limit; - if (limit != limit32) - return false; + if (limit != (u32)limit) + return -EINVAL; status = vmballoon_cmd(b, VMW_BALLOON_CMD_GET_TARGET, limit, 0); - if (status == VMW_BALLOON_SUCCESS) - return true; - - return false; + return status == VMW_BALLOON_SUCCESS ? 0 : -EIO; } static struct page *vmballoon_alloc_page(bool is_2m_page) @@ -960,7 +953,7 @@ static void vmballoon_work(struct work_struct *work) if (b->reset_required) vmballoon_reset(b); - if (vmballoon_send_get_target(b)) + if (!vmballoon_send_get_target(b)) change = vmballoon_change(b); if (change != 0) { -- 2.17.1