From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753882AbdBUQ2n (ORCPT ); Tue, 21 Feb 2017 11:28:43 -0500 Received: from mx0a-001b2d01.pphosted.com ([148.163.156.1]:34054 "EHLO mx0a-001b2d01.pphosted.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753659AbdBUQ1Q (ORCPT ); Tue, 21 Feb 2017 11:27:16 -0500 From: "Naveen N. Rao" To: Michael Ellerman , Ananth N Mavinakayanahalli , Masami Hiramatsu Cc: linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Subject: [PATCH v2 3/5] kprobes: Skip preparing optprobe if the probe is ftrace-based Date: Tue, 21 Feb 2017 21:56:04 +0530 X-Mailer: git-send-email 2.11.0 In-Reply-To: <657c6623953f6cce52f929a93cc250b7ee76d7cc.1487692624.git.naveen.n.rao@linux.vnet.ibm.com> References: <657c6623953f6cce52f929a93cc250b7ee76d7cc.1487692624.git.naveen.n.rao@linux.vnet.ibm.com> In-Reply-To: <657c6623953f6cce52f929a93cc250b7ee76d7cc.1487692624.git.naveen.n.rao@linux.vnet.ibm.com> References: <657c6623953f6cce52f929a93cc250b7ee76d7cc.1487692624.git.naveen.n.rao@linux.vnet.ibm.com> X-TM-AS-MML: disable X-Content-Scanned: Fidelis XPS MAILER x-cbid: 17022116-0016-0000-0000-0000021C3AB0 X-IBM-AV-DETECTION: SAVI=unused REMOTE=unused XFE=unused x-cbparentid: 17022116-0017-0000-0000-000006750FF7 Message-Id: X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2017-02-21_13:,, signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 spamscore=0 suspectscore=0 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1702210154 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Masami Hiramatsu Skip preparing optprobe if the probe is ftrace-based, since anyway, it must not be optimized (or already optimized by ftrace). Tested-by: Naveen N. Rao Signed-off-by: Masami Hiramatsu --- kernel/kprobes.c | 11 +++++++++-- 1 file changed, 9 insertions(+), 2 deletions(-) diff --git a/kernel/kprobes.c b/kernel/kprobes.c index fbc7a70ff33e..7e93500dede7 100644 --- a/kernel/kprobes.c +++ b/kernel/kprobes.c @@ -708,13 +708,20 @@ static void kill_optimized_kprobe(struct kprobe *p) arch_remove_optimized_kprobe(op); } +static inline +void __prepare_optimized_kprobe(struct optimized_kprobe *op, struct kprobe *p) +{ + if (!kprobe_ftrace(p)) + arch_prepare_optimized_kprobe(op, p); +} + /* Try to prepare optimized instructions */ static void prepare_optimized_kprobe(struct kprobe *p) { struct optimized_kprobe *op; op = container_of(p, struct optimized_kprobe, kp); - arch_prepare_optimized_kprobe(op, p); + __prepare_optimized_kprobe(op, p); } /* Allocate new optimized_kprobe and try to prepare optimized instructions */ @@ -728,7 +735,7 @@ static struct kprobe *alloc_aggr_kprobe(struct kprobe *p) INIT_LIST_HEAD(&op->list); op->kp.addr = p->addr; - arch_prepare_optimized_kprobe(op, p); + __prepare_optimized_kprobe(op, p); return &op->kp; } -- 2.11.0