From patchwork Mon Mar 22 06:42:02 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: 12153913 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=unavailable 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 C4FE7C433DB for ; Mon, 22 Mar 2021 06:43:18 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 95C2D61970 for ; Mon, 22 Mar 2021 06:43:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229979AbhCVGmp (ORCPT ); Mon, 22 Mar 2021 02:42:45 -0400 Received: from mail.kernel.org ([198.145.29.99]:56270 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230076AbhCVGmI (ORCPT ); Mon, 22 Mar 2021 02:42:08 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 8CA0861937; Mon, 22 Mar 2021 06:42:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1616395327; bh=oFlPu06uz5j9auNWsJ3R0Ish/3if57XYi76+/Eh3Oqs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=jQTF8FEHohRWKV1+oanZkpW87IrtfiG7UAzd2fgPz5/jCJ6HtMPVid3UgMBUs1N77 TTCFc2eVUSG4eBckHLmv+MAt2PXfUIMIsk6rHHRdjgIJYEdRbbBxGbqSzV7zHZU31d vNcJKYdvGygakTpNWwG225hMcGIArWfBwvnRd0Oqrx3DtJdLl5ijVq7RxRhh4Qrslq bW51JvOfi6dCE99DWaKf0Bod1orjU4tZQ473wjh10x2le3jKakGHVtOKtdZtFhh6eG Ew0ht5ZLqTQJZ127MMBzaKFRomLvujqGu2m/6nMC2IB2o7Y9YSJIuGkZ5Rwu7S8XvM 3fviNCPp85VMw== 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, Abhishek Sagar Subject: [PATCH -tip v4 12/12] tracing: Show kretprobe unknown indicator only for kretprobe_trampoline Date: Mon, 22 Mar 2021 15:42:02 +0900 Message-Id: <161639532235.895304.18329540036405219298.stgit@devnote2> X-Mailer: git-send-email 2.25.1 In-Reply-To: <161639518354.895304.15627519393073806809.stgit@devnote2> References: <161639518354.895304.15627519393073806809.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 Acked-by: Steven Rostedt (VMware) --- 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);