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,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 65C97C433F4 for ; Sun, 23 Sep 2018 12:02:23 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E82D12148D for ; Sun, 23 Sep 2018 12:02:22 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E82D12148D Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=huawei.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 S1726230AbeIWR7g (ORCPT ); Sun, 23 Sep 2018 13:59:36 -0400 Received: from szxga05-in.huawei.com ([45.249.212.191]:12679 "EHLO huawei.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1726126AbeIWR7g (ORCPT ); Sun, 23 Sep 2018 13:59:36 -0400 Received: from DGGEMS402-HUB.china.huawei.com (unknown [172.30.72.59]) by Forcepoint Email with ESMTP id B0F92CB3934AB; Sun, 23 Sep 2018 20:02:13 +0800 (CST) Received: from localhost.localdomain.localdomain (10.175.113.25) by DGGEMS402-HUB.china.huawei.com (10.3.19.202) with Microsoft SMTP Server id 14.3.399.0; Sun, 23 Sep 2018 20:02:07 +0800 From: YueHaibing To: Steven Rostedt , Ingo Molnar CC: YueHaibing , , Subject: [PATCH -next] ring-buffer: Fix ring buffer size in rb_write_something Date: Sun, 23 Sep 2018 12:11:33 +0000 Message-ID: <1537704693-184237-1-git-send-email-yuehaibing@huawei.com> X-Mailer: git-send-email 1.8.3.1 Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: 7bit MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-CFilter-Loop: Reflected Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 'cnt' should be used to calculate ring buffer size rather than data->cnt Signed-off-by: YueHaibing --- kernel/trace/ring_buffer.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c index 65bd461..53538c3 100644 --- a/kernel/trace/ring_buffer.c +++ b/kernel/trace/ring_buffer.c @@ -4924,7 +4924,7 @@ static __init int rb_write_something(struct rb_test_data *data, bool nested) cnt = data->cnt + (nested ? 27 : 0); /* Multiply cnt by ~e, to make some unique increment */ - size = (data->cnt * 68 / 25) % (sizeof(rb_string) - 1); + size = (cnt * 68 / 25) % (sizeof(rb_string) - 1); len = size + sizeof(struct rb_item);