From patchwork Thu Apr 16 13:24:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 227608 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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 E639FC352BE for ; Thu, 16 Apr 2020 15:34:06 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BAEE121927 for ; Thu, 16 Apr 2020 15:34:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587051246; bh=QbwX/cYzHyWzd67ry82iq9jNyfuA+lBj+qA600TsiTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=VN9DNwtQLrGpyN3fkYeQvVBDwIx5VHa9cPcgUfHpa9HaPry4do9Bjn5AMT+Fx97nx NtybSbJ9XuezFBm/nPafB5AJqeAwlEYF31WDpXBf7vyvXXqyMdbdOTUs5sTLuCCwjy 6d91koRLMqxt98/OByLLY0PxF5OX1BmwsSg3fI2M= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2442574AbgDPPeF (ORCPT ); Thu, 16 Apr 2020 11:34:05 -0400 Received: from mail.kernel.org ([198.145.29.99]:53694 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2898238AbgDPNk7 (ORCPT ); Thu, 16 Apr 2020 09:40:59 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 7F8DC218AC; Thu, 16 Apr 2020 13:40:58 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1587044459; bh=QbwX/cYzHyWzd67ry82iq9jNyfuA+lBj+qA600TsiTs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=s/fnn7pcRduf6otexAv+VM498/y2wwNIhoJdolhDw+MncTyvSqqhqZFscO8rwZZ78 4tOjUkMkEJIPPK7v9sW9u+JRR9zSJm4qC46JZ44/J6CbLs0mAeJKgSD5HOdBLeYjoM URNSNwx3ToUxQ2DC1egpUN/Dcbog5LieFR6iF3Rw= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Taeung Song , Masami Hiramatsu , "Steven Rostedt (VMware)" Subject: [PATCH 5.5 226/257] ftrace/kprobe: Show the maxactive number on kprobe_events Date: Thu, 16 Apr 2020 15:24:37 +0200 Message-Id: <20200416131354.086051025@linuxfoundation.org> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20200416131325.891903893@linuxfoundation.org> References: <20200416131325.891903893@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Masami Hiramatsu commit 6a13a0d7b4d1171ef9b80ad69abc37e1daa941b3 upstream. Show maxactive parameter on kprobe_events. This allows user to save the current configuration and restore it without losing maxactive parameter. Link: http://lkml.kernel.org/r/4762764a-6df7-bc93-ed60-e336146dce1f@gmail.com Link: http://lkml.kernel.org/r/158503528846.22706.5549974121212526020.stgit@devnote2 Cc: stable@vger.kernel.org Fixes: 696ced4fb1d76 ("tracing/kprobes: expose maxactive for kretprobe in kprobe_events") Reported-by: Taeung Song Signed-off-by: Masami Hiramatsu Signed-off-by: Steven Rostedt (VMware) Signed-off-by: Greg Kroah-Hartman --- kernel/trace/trace_kprobe.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/trace/trace_kprobe.c +++ b/kernel/trace/trace_kprobe.c @@ -918,6 +918,8 @@ static int trace_kprobe_show(struct seq_ int i; seq_putc(m, trace_kprobe_is_return(tk) ? 'r' : 'p'); + if (trace_kprobe_is_return(tk) && tk->rp.maxactive) + seq_printf(m, "%d", tk->rp.maxactive); seq_printf(m, ":%s/%s", trace_probe_group_name(&tk->tp), trace_probe_name(&tk->tp));