Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 19F4BC433EF for ; Fri, 26 Nov 2021 12:10:08 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231974AbhKZMNT (ORCPT ); Fri, 26 Nov 2021 07:13:19 -0500 Received: from szxga01-in.huawei.com ([45.249.212.187]:31912 "EHLO szxga01-in.huawei.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1377476AbhKZMLL (ORCPT ); Fri, 26 Nov 2021 07:11:11 -0500 Received: from dggemv703-chm.china.huawei.com (unknown [172.30.72.57]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4J0tmT0KvWzcbJm; Fri, 26 Nov 2021 20:07:53 +0800 (CST) Received: from kwepemm600016.china.huawei.com (7.193.23.20) by dggemv703-chm.china.huawei.com (10.3.19.46) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Fri, 26 Nov 2021 20:07:56 +0800 Received: from localhost.localdomain (10.67.165.24) by kwepemm600016.china.huawei.com (7.193.23.20) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2308.20; Fri, 26 Nov 2021 20:07:55 +0800 From: Guangbin Huang To: , , CC: , , , , Subject: [PATCH net 3/4] net: hns3: fix one incorrect value of page pool info when queried by debugfs Date: Fri, 26 Nov 2021 20:03:17 +0800 Message-ID: <20211126120318.33921-4-huangguangbin2@huawei.com> X-Mailer: git-send-email 2.33.0 In-Reply-To: <20211126120318.33921-1-huangguangbin2@huawei.com> References: <20211126120318.33921-1-huangguangbin2@huawei.com> MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [10.67.165.24] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To kwepemm600016.china.huawei.com (7.193.23.20) X-CFilter-Loop: Reflected Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Hao Chen Currently, when user queries page pool info by debugfs command "cat page_pool_info", the cnt of allocated page for page pool may be incorrect because of memory inconsistency problem caused by compiler optimization. So this patch uses READ_ONCE() to read value of pages_state_hold_cnt to fix this problem. Fixes: 850bfb912a6d ("net: hns3: debugfs add support dumping page pool info") Signed-off-by: Hao Chen Signed-off-by: Guangbin Huang --- drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c index fbb8a5f08222..081295bff765 100644 --- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c +++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c @@ -1081,7 +1081,8 @@ static void hns3_dump_page_pool_info(struct hns3_enet_ring *ring, u32 j = 0; sprintf(result[j++], "%u", index); - sprintf(result[j++], "%u", ring->page_pool->pages_state_hold_cnt); + sprintf(result[j++], "%u", + READ_ONCE(ring->page_pool->pages_state_hold_cnt)); sprintf(result[j++], "%u", atomic_read(&ring->page_pool->pages_state_release_cnt)); sprintf(result[j++], "%u", ring->page_pool->p.pool_size); -- 2.33.0