From patchwork Thu Feb 12 12:20:19 2015 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Wang Nan X-Patchwork-Id: 5819511 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 0CF499F37F for ; Thu, 12 Feb 2015 12:51:03 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 51B4A2012E for ; Thu, 12 Feb 2015 12:51:02 +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 7A7B220103 for ; Thu, 12 Feb 2015 12:51:01 +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 1YLtBb-0005Gl-IT; Thu, 12 Feb 2015 12:48:03 +0000 Received: from szxga01-in.huawei.com ([119.145.14.64]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1YLsw9-0003cL-Gl for linux-arm-kernel@lists.infradead.org; Thu, 12 Feb 2015 12:32:06 +0000 Received: from 172.24.2.119 (EHLO lggeml421-hub.china.huawei.com) ([172.24.2.119]) by szxrg01-dlp.huawei.com (MOS 4.3.7-GA FastPath queued) with ESMTP id CJL31429; Thu, 12 Feb 2015 20:27:08 +0800 (CST) Received: from kernel-host.huawei (10.107.197.247) by lggeml421-hub.china.huawei.com (10.72.61.31) with Microsoft SMTP Server id 14.3.158.1; Thu, 12 Feb 2015 20:26:59 +0800 From: Wang Nan To: , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , Subject: [RFC PATCH v2 11/26] early kprobes: introduce kprobe_is_early for futher early kprobe use. Date: Thu, 12 Feb 2015 20:20:19 +0800 Message-ID: <1423743619-12498-1-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_043205_854097_CA36AEF1 X-CRM114-Status: UNSURE ( 6.13 ) 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 Following early kprobe patches will enable kprobe registering very early, even before kprobe system initialized. kprobe_is_early() can be used to check whether we are working on early kprobe. Signed-off-by: Wang Nan --- include/linux/kprobes.h | 2 ++ kernel/kprobes.c | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/include/linux/kprobes.h b/include/linux/kprobes.h index 1ab5475..e1c8307 100644 --- a/include/linux/kprobes.h +++ b/include/linux/kprobes.h @@ -50,6 +50,8 @@ #define KPROBE_REENTER 0x00000004 #define KPROBE_HIT_SSDONE 0x00000008 +extern int kprobes_is_early(void); + #else /* CONFIG_KPROBES */ typedef int kprobe_opcode_t; struct arch_specific_insn { diff --git a/kernel/kprobes.c b/kernel/kprobes.c index c90e417..647c95a 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -68,6 +68,12 @@ #endif static int kprobes_initialized; + +int kprobes_is_early(void) +{ + return !kprobes_initialized; +} + static struct hlist_head kprobe_table[KPROBE_TABLE_SIZE]; static struct hlist_head kretprobe_inst_table[KPROBE_TABLE_SIZE];