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=-9.7 required=3.0 tests=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 6F5DBC76192 for ; Thu, 18 Jul 2019 03:07:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4EB722173B for ; Thu, 18 Jul 2019 03:07:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390331AbfGRDG7 (ORCPT ); Wed, 17 Jul 2019 23:06:59 -0400 Received: from mga12.intel.com ([192.55.52.136]:49738 "EHLO mga12.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2390322AbfGRDGw (ORCPT ); Wed, 17 Jul 2019 23:06:52 -0400 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga003.fm.intel.com ([10.253.24.29]) by fmsmga106.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 17 Jul 2019 20:06:51 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.64,276,1559545200"; d="scan'208";a="175892069" Received: from devel-ww.sh.intel.com ([10.239.48.128]) by FMSMGA003.fm.intel.com with ESMTP; 17 Jul 2019 20:06:49 -0700 From: Wei Wang To: linux-mm@kvack.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, mst@redhat.com, xdeguillard@vmware.com, namit@vmware.com Cc: akpm@linux-foundation.org, pagupta@redhat.com, riel@surriel.com, dave.hansen@intel.com, david@redhat.com, konrad.wilk@oracle.com, yang.zhang.wz@gmail.com, nitesh@redhat.com, lcapitulino@redhat.com, aarcange@redhat.com, pbonzini@redhat.com, alexander.h.duyck@linux.intel.com, dan.j.williams@intel.com Subject: [PATCH v1] mm/balloon_compaction: avoid duplicate page removal Date: Thu, 18 Jul 2019 10:23:30 +0800 Message-Id: <1563416610-11045-1-git-send-email-wei.w.wang@intel.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Fixes: 418a3ab1e778 (mm/balloon_compaction: List interfaces) A #GP is reported in the guest when requesting balloon inflation via virtio-balloon. The reason is that the virtio-balloon driver has removed the page from its internal page list (via balloon_page_pop), but balloon_page_enqueue_one also calls "list_del" to do the removal. So remove the list_del in balloon_page_enqueue_one, and have the callers do the page removal from their own page lists. Signed-off-by: Wei Wang --- mm/balloon_compaction.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/mm/balloon_compaction.c b/mm/balloon_compaction.c index 83a7b61..1a5ddc4 100644 --- a/mm/balloon_compaction.c +++ b/mm/balloon_compaction.c @@ -11,6 +11,7 @@ #include #include +/* Callers ensure that @page has been removed from its original list. */ static void balloon_page_enqueue_one(struct balloon_dev_info *b_dev_info, struct page *page) { @@ -21,7 +22,6 @@ static void balloon_page_enqueue_one(struct balloon_dev_info *b_dev_info, * memory corruption is possible and we should stop execution. */ BUG_ON(!trylock_page(page)); - list_del(&page->lru); balloon_page_insert(b_dev_info, page); unlock_page(page); __count_vm_event(BALLOON_INFLATE); @@ -47,6 +47,7 @@ size_t balloon_page_list_enqueue(struct balloon_dev_info *b_dev_info, spin_lock_irqsave(&b_dev_info->pages_lock, flags); list_for_each_entry_safe(page, tmp, pages, lru) { + list_del(&page->lru); balloon_page_enqueue_one(b_dev_info, page); n_pages++; } -- 2.7.4