From patchwork Thu Feb 12 12:19:36 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 5819211 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id D3CBD9F380 for ; Thu, 12 Feb 2015 12:31:58 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 2CD2F20149 for ; Thu, 12 Feb 2015 12:31:57 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 4FE5B2021B for ; Thu, 12 Feb 2015 12:31:56 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1YLstV-00014r-T4; Thu, 12 Feb 2015 12:29:21 +0000 Received: from szxga02-in.huawei.com ([119.145.14.65]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YLssM-00005m-4b; Thu, 12 Feb 2015 12:28:11 +0000 Received: from 172.24.2.119 (EHLO lggeml422-hub.china.huawei.com) ([172.24.2.119]) by szxrg02-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CHF26242; Thu, 12 Feb 2015 20:26:24 +0800 (CST) Received: from kernel-host.huawei (10.107.197.247) by lggeml422-hub.china.huawei.com (10.72.61.32) with Microsoft SMTP Server id 14.3.158.1; Thu, 12 Feb 2015 20:26:16 +0800 From: Wang Nan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH v2 05/26] ftrace/x86: Ensure rec->flags no change when failure occures. Date: Thu, 12 Feb 2015 20:19:36 +0800 Message-ID: <1423743576-12224-1-git-send-email-wangnan0@huawei.com> X-Mailer: git-send-email 1.8.4 In-Reply-To: <1423743476-11927-1-git-send-email-wangnan0@huawei.com> References: <1423743476-11927-1-git-send-email-wangnan0@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.107.197.247] X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20150212_042810_587315_463CD4D2 X-CRM114-Status: UNSURE ( 8.58 ) X-CRM114-Notice: Please train this message. X-Spam-Score: -0.7 (/) Cc: lizefan@huawei.com, x86@kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Spam-Status: No, score=-4.2 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_MED, T_RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Don't change rec->flags if code modification fails. Signed-off-by: Wang Nan --- arch/x86/kernel/ftrace.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 8b7b0a5..7bdba65 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -497,6 +497,7 @@ static int finish_update(struct dyn_ftrace *rec, int enable) { unsigned long ftrace_addr; int ret; + unsigned long old_flags = rec->flags; ret = ftrace_update_record(rec, enable); @@ -509,14 +510,18 @@ static int finish_update(struct dyn_ftrace *rec, int enable) case FTRACE_UPDATE_MODIFY_CALL: case FTRACE_UPDATE_MAKE_CALL: /* converting nop to call */ - return finish_update_call(rec, ftrace_addr); + ret = finish_update_call(rec, ftrace_addr); + break; case FTRACE_UPDATE_MAKE_NOP: /* converting a call to a nop */ - return finish_update_nop(rec); + ret = finish_update_nop(rec); + break; } - return 0; + if (ret) + rec->flags = old_flags; + return ret; } static void do_sync_core(void *data)