From patchwork Fri Mar 19 12:23:45 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Masami Hiramatsu (Google)" X-Patchwork-Id: 12150945 X-Patchwork-Delegate: kuba@kernel.org 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=-19.2 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,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 CC27DC433DB for ; Fri, 19 Mar 2021 12:24:25 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9A0BB64F6E for ; Fri, 19 Mar 2021 12:24:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230166AbhCSMX4 (ORCPT ); Fri, 19 Mar 2021 08:23:56 -0400 Received: from mail.kernel.org ([198.145.29.99]:34564 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230169AbhCSMXu (ORCPT ); Fri, 19 Mar 2021 08:23:50 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 87A7864F11; Fri, 19 Mar 2021 12:23:47 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616156630; bh=oFlPu06uz5j9auNWsJ3R0Ish/3if57XYi76+/Eh3Oqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=kTY/Mk7Flul+ihiE8xxw+9ZtCqF9YcC8SqyaRpBLfFLhCkYrDSHucz2JaqpkH4eZ4 bcyyZH37nZYy9VKdq6niAnK9R2NCKBbqVY5igUa6IFcCTCCU/v+lmPtLkmw4TyaMYs f3sj4oxRqSyaVs5YCKJY/jAy0QecJbBMsXUBXIHyJb/Wx1sGuhF5zNmxO99pJ0HsoW 3tFOMlih/clCGylf6NAtA81lNA7bBJjVwhmcBfE9Jzyovr/kw9uK/7eoBBIcLyL7sx lv/9aWHqN1yF5z1eToNAuZ5yDPfpimuvYtqiOWiNwTspTkAtrxKo1/QLwIArmQrysl zS0MqdxDsrmqA== From: Masami Hiramatsu To: Steven Rostedt , Ingo Molnar Cc: X86 ML , Masami Hiramatsu , Daniel Xu , linux-kernel@vger.kernel.org, bpf@vger.kernel.org, kuba@kernel.org, mingo@redhat.com, ast@kernel.org, tglx@linutronix.de, kernel-team@fb.com, yhs@fb.com, Josh Poimboeuf , linux-ia64@vger.kernel.org Subject: [PATCH -tip v3 11/11] tracing: Show kretprobe unknown indicator only for kretprobe_trampoline Date: Fri, 19 Mar 2021 21:23:45 +0900 Message-Id: <161615662521.306069.3578204343927212072.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <161615650355.306069.17260992641363840330.stgit@devnote2> References: <161615650355.306069.17260992641363840330.stgit@devnote2> User-Agent: StGit/0.19 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org ftrace shows "[unknown/kretprobe'd]" indicator all addresses in the kretprobe_trampoline, but the modified address by kretprobe should be only kretprobe_trampoline+0. Signed-off-by: Masami Hiramatsu --- kernel/trace/trace_output.c | 17 ++++------------- 1 file changed, 4 insertions(+), 13 deletions(-) diff --git a/kernel/trace/trace_output.c b/kernel/trace/trace_output.c index 61255bad7e01..e12437388686 100644 --- a/kernel/trace/trace_output.c +++ b/kernel/trace/trace_output.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include @@ -346,22 +347,12 @@ 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 inline const char *kretprobed(const char *name, unsigned long addr) { - static const char tramp_name[] = "kretprobe_trampoline"; - int size = sizeof(tramp_name); - - if (strncmp(tramp_name, name, size) == 0) + if (is_kretprobe_trampoline(addr)) return "[unknown/kretprobe'd]"; return name; } -#else -static inline const char *kretprobed(const char *name) -{ - return name; -} -#endif /* CONFIG_KRETPROBES */ void trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) @@ -374,7 +365,7 @@ trace_seq_print_sym(struct trace_seq *s, unsigned long address, bool offset) sprint_symbol(str, address); else kallsyms_lookup(address, NULL, NULL, NULL, str); - name = kretprobed(str); + name = kretprobed(str, address); if (name && strlen(name)) { trace_seq_puts(s, name);