From patchwork Wed Oct 31 15:25:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Aleksa Sarai X-Patchwork-Id: 991510 X-Patchwork-Delegate: davem@davemloft.net Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=none (mailfrom) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=none (p=none dis=none) header.from=cyphar.com Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 42lXHX0rLbz9s4s for ; Thu, 1 Nov 2018 02:26:32 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729492AbeKAAYx (ORCPT ); Wed, 31 Oct 2018 20:24:53 -0400 Received: from mx2.mailbox.org ([80.241.60.215]:35652 "EHLO mx2.mailbox.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728698AbeKAAYw (ORCPT ); Wed, 31 Oct 2018 20:24:52 -0400 Received: from smtp1.mailbox.org (unknown [IPv6:2001:67c:2050:105:465:1:1:0]) (using TLSv1.2 with cipher ECDHE-RSA-CHACHA20-POLY1305 (256/256 bits)) (No client certificate requested) by mx2.mailbox.org (Postfix) with ESMTPS id 62960A11EE; Wed, 31 Oct 2018 16:26:21 +0100 (CET) X-Virus-Scanned: amavisd-new at heinlein-support.de Received: from smtp1.mailbox.org ([80.241.60.240]) by spamfilter04.heinlein-hosting.de (spamfilter04.heinlein-hosting.de [80.241.56.122]) (amavisd-new, port 10030) with ESMTP id ryuJHW3PXG4w; Wed, 31 Oct 2018 16:26:20 +0100 (CET) From: Aleksa Sarai To: "Naveen N. Rao" , Anil S Keshavamurthy , "David S. Miller" , Masami Hiramatsu , Jonathan Corbet , Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Alexander Shishkin , Jiri Olsa , Namhyung Kim , Steven Rostedt , Shuah Khan , Alexei Starovoitov , Daniel Borkmann Cc: Aleksa Sarai , Aleksa Sarai , Christian Brauner , Brendan Gregg , netdev@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org Subject: [PATCH v2 2/2] trace: remove kretprobed checks Date: Thu, 1 Nov 2018 02:25:43 +1100 Message-Id: <20181031152543.12138-3-cyphar@cyphar.com> In-Reply-To: <20181031152543.12138-1-cyphar@cyphar.com> References: <20181031152543.12138-1-cyphar@cyphar.com> MIME-Version: 1.0 Sender: netdev-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org This is effectively a reversion of commit 76094a2cf46e ("ftrace: distinguish kretprobe'd functions in trace logs"), as the checking of kretprobe_trampoline *for tracing* is no longer necessary with the new kretprobe stack trace changes. Signed-off-by: Aleksa Sarai --- kernel/trace/trace_output.c | 34 ++++------------------------------ 1 file changed, 4 insertions(+), 30 deletions(-) diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 6e6cc64faa38..951de16bd4fd 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -321,36 +321,14 @@ int trace_output_call(struct trace_iterator *iter, char *name, char *fmt, ...) } EXPORT_SYMBOL_GPL(trace_output_call); -#ifdef CONFIG_KRETPROBES -static inline const char *kretprobed(const char *name) -{ - static const char tramp_name[] = "kretprobe_trampoline"; - int size = sizeof(tramp_name); - - if (strncmp(tramp_name, name, size) == 0) - return "[unknown/kretprobe'd]"; - return name; -} -#else -static inline const char *kretprobed(const char *name) -{ - return name; -} -#endif /* CONFIG_KRETPROBES */ - static void seq_print_sym_short(struct trace_seq *s, const char *fmt, unsigned long address) { char str[KSYM_SYMBOL_LEN]; #ifdef CONFIG_KALLSYMS - const char *name; - kallsyms_lookup(address, NULL, NULL, NULL, str); - - name = kretprobed(str); - - if (name && strlen(name)) { - trace_seq_printf(s, fmt, name); + if (strlen(str)) { + trace_seq_printf(s, fmt, str); return; } #endif @@ -364,13 +342,9 @@ seq_print_sym_offset(struct trace_seq *s, const char *fmt, { char str[KSYM_SYMBOL_LEN]; #ifdef CONFIG_KALLSYMS - const char *name; - sprint_symbol(str, address); - name = kretprobed(str); - - if (name && strlen(name)) { - trace_seq_printf(s, fmt, name); + if (strlen(str)) { + trace_seq_printf(s, fmt, str); return; } #endif