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=-12.8 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 CCE49C433E3 for ; Fri, 24 Jul 2020 12:42:58 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id A7F932074B for ; Fri, 24 Jul 2020 12:42:58 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=citrix.com header.i=@citrix.com header.b="Nnd2DW6M" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727040AbgGXMm5 (ORCPT ); Fri, 24 Jul 2020 08:42:57 -0400 Received: from esa2.hc3370-68.iphmx.com ([216.71.145.153]:33206 "EHLO esa2.hc3370-68.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726329AbgGXMmz (ORCPT ); Fri, 24 Jul 2020 08:42:55 -0400 DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=citrix.com; s=securemail; t=1595594575; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=7Tw4G/V7kxbTklR4OkIgBDvRcTQey+xrJa3KZIIL0yE=; b=Nnd2DW6MmAEeZtU4bHtBWreBcqZi6wBvSpTqVLHJoDR2SkbjNPs4bAHf ojKOJbc/ItzbVs76POKF+R+zw5KfwdPE78toKDCYB1Ztq9ViO6wLV8wNr 5KuMVkmM6EOE40lf5pVdPz6U0xXqdpybdOvvc3DOoYu9LoqTrl8T0omA+ U=; Authentication-Results: esa2.hc3370-68.iphmx.com; dkim=none (message not signed) header.i=none IronPort-SDR: 1RmtWXLEVLsjBBebMyNb9dJntTLAmrgMDJmAs3T9l48/E9hvv/9Zz/JGcwmC/qk907TZ5cCnhv JD3rZBNMfCwCn/WlbKh5LBFv7oL/dKr6eU4+jdqj7dHQOQQqNjdvpYQ66LyEy3gb9PIHCC1MrD kmD0iJEk7E1uJWWtM02WnuIA+Yoq9Ra2+LyjJAAjbuuR1etEvwEpbBKBYFOxclIwriVbLZlQRM khIh9nzeMT3Dhtv9/vt6aqAXVFbKhToIhnx5qJOUTVfm1CHLGLlsws80oqkAFKPc/SW8TD/l4h FnA= X-SBRS: 2.7 X-MesageID: 23139909 X-Ironport-Server: esa2.hc3370-68.iphmx.com X-Remote-IP: 162.221.158.21 X-Policy: $RELAYED X-IronPort-AV: E=Sophos;i="5.75,390,1589256000"; d="scan'208";a="23139909" From: Roger Pau Monne To: CC: Roger Pau Monne , , "Boris Ostrovsky" , Juergen Gross , Stefano Stabellini , Subject: [PATCH v2 2/4] xen/balloon: make the balloon wait interruptible Date: Fri, 24 Jul 2020 14:42:39 +0200 Message-ID: <20200724124241.48208-3-roger.pau@citrix.com> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200724124241.48208-1-roger.pau@citrix.com> References: <20200724124241.48208-1-roger.pau@citrix.com> MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org So it can be killed, or else processes can get hung indefinitely waiting for balloon pages. Signed-off-by: Roger Pau Monné Cc: stable@vger.kernel.org --- Cc: Boris Ostrovsky Cc: Juergen Gross Cc: Stefano Stabellini Cc: xen-devel@lists.xenproject.org --- drivers/xen/balloon.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c index 3cb10ed32557..292413b27575 100644 --- a/drivers/xen/balloon.c +++ b/drivers/xen/balloon.c @@ -568,11 +568,13 @@ static int add_ballooned_pages(int nr_pages) if (xen_hotplug_unpopulated) { st = reserve_additional_memory(); if (st != BP_ECANCELED) { + int rc; + mutex_unlock(&balloon_mutex); - wait_event(balloon_wq, + rc = wait_event_interruptible(balloon_wq, !list_empty(&ballooned_pages)); mutex_lock(&balloon_mutex); - return 0; + return rc ? -ENOMEM : 0; } } -- 2.27.0