From mboxrd@z Thu Jan 1 00:00:00 1970 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=-8.8 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, 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 D1919C43381 for ; Tue, 26 Mar 2019 12:13:51 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 9D8512070D for ; Tue, 26 Mar 2019 12:13:51 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="QHlbf4UU" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1731449AbfCZMNu (ORCPT ); Tue, 26 Mar 2019 08:13:50 -0400 Received: from mail-pf1-f195.google.com ([209.85.210.195]:33243 "EHLO mail-pf1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726175AbfCZMNt (ORCPT ); Tue, 26 Mar 2019 08:13:49 -0400 Received: by mail-pf1-f195.google.com with SMTP id i19so7996153pfd.0 for ; Tue, 26 Mar 2019 05:13:49 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=mCYbGmR9tENrJETVY8U3vERANzorFWafknFB1qXIOrM=; b=QHlbf4UU3ilHN9JYT82ULeIK1MLOWiJZpWhw47R/UtiQShZhOYo/6rkvtB2jXotyLN fFeUchRriz5XmSW2EOEvsFpUpOfCgA3syL6GU6fvWkeuapmOo6/+v5kRqDX6kmONH4wz jeBmfIxch5XHIngA5WzIdbmpFzpplgkrSkk5KFScD7CgmMC/EMn2dnOz+AYhTuhHfC3A 40+AkmOgOqYDPYlgdYA82SFTYzI0XRWu0Ohryy2h4MZnfs2epvtCgQYI+Tzu+ixhQhwJ HA1SJOA5pAYUDzmiHrMN/6nBE7AEkVqu1OL/J3QoIjrvWNqRFENF1y0rpwXgCYpE+G4t qCFQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=mCYbGmR9tENrJETVY8U3vERANzorFWafknFB1qXIOrM=; b=i/pTbgj5St+xVvtivPmIxzeVqNkWbWz1PgKFI13z2rwe856Kqzg9NKH6iwHeb2msuI 8APqrOtgDDa8/9AMpbkeaDtuyuF5DgN33B073dWBhgY+pnq0l8Sbv5ZxeBRGZawI6gNR NC0gSCVKTxR3TyIZJ6EpUZCIiPhydVAKqZqKn/qW8ZV4sHuNvLLdCEqn3GUQNTCK+lAo SAms1BlT/u5MfGqlwN+5l7+7oWopisctRT57YaF+q3zdB2f7ovRYySE7djTZR15Smxev jXOCUA+xD0CTVUKuyaSSDGe2ljqvW9dvQiWaLJ1wMulrjOp9cRRprkiOX+ryLtu6JCiF nkKw== X-Gm-Message-State: APjAAAUSMwwmUbvHm4jA805P5EktZXISpG0cjYJt86YNUP1/bcBgxXV5 6by+3w095nWFqyxGoxSa+Us= X-Google-Smtp-Source: APXvYqzugEMVLXvkPliP/6KvNX6Bt9FBw2cechtEdao9/2mAvgpvcoTYSy8MTvT/8aqFa9M0zKZXiQ== X-Received: by 2002:a62:e911:: with SMTP id j17mr29343193pfh.107.1553602429012; Tue, 26 Mar 2019 05:13:49 -0700 (PDT) Received: from localhost.localdomain ([203.100.54.194]) by smtp.gmail.com with ESMTPSA id e2sm31263881pfa.64.2019.03.26.05.13.45 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 26 Mar 2019 05:13:48 -0700 (PDT) From: Yafang Shao To: rostedt@goodmis.org Cc: mingo@redhat.com, peterz@infradead.org, paulmck@linux.ibm.com, josh@joshtriplett.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com, joel@joelfernandes.org, linux-kernel@vger.kernel.org, shaoyafang@didiglobal.com, Yafang Shao Subject: [PATCH v2 1/3] tracing: introduce TRACE_EVENT_NOP() Date: Tue, 26 Mar 2019 20:13:09 +0800 Message-Id: <1553602391-11926-2-git-send-email-laoar.shao@gmail.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1553602391-11926-1-git-send-email-laoar.shao@gmail.com> References: <1553602391-11926-1-git-send-email-laoar.shao@gmail.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Sometimes we want to define a tracepoint as a do-nothing function. So I introduce TRACE_EVENT_NOP, DECLARE_EVENT_CLASS_NOP and DEFINE_EVENT_NOP for this kind of usage. Signed-off-by: Yafang Shao --- include/linux/tracepoint.h | 15 +++++++++++++++ include/trace/define_trace.h | 8 ++++++++ 2 files changed, 23 insertions(+) diff --git a/include/linux/tracepoint.h b/include/linux/tracepoint.h index 9c31865..86b019a 100644 --- a/include/linux/tracepoint.h +++ b/include/linux/tracepoint.h @@ -548,4 +548,19 @@ static inline struct tracepoint *tracepoint_ptr_deref(tracepoint_ptr_t *p) #define TRACE_EVENT_PERF_PERM(event, expr...) +#define DECLARE_EVENT_NOP(name, proto, args) \ + static inline void trace_##name(proto) \ + { } \ + static inline bool trace_##name##_enabled(void) \ + { \ + return false; \ + } + +#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) \ + DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) + +#define DECLARE_EVENT_CLASS_NOP(name, proto, args, tstruct, assign, print) +#define DEFINE_EVENT_NOP(template, name, proto, args) \ + DECLARE_EVENT_NOP(name, PARAMS(proto), PARAMS(args)) + #endif /* ifdef TRACE_EVENT (see note above) */ diff --git a/include/trace/define_trace.h b/include/trace/define_trace.h index cb30c55..bd75f97 100644 --- a/include/trace/define_trace.h +++ b/include/trace/define_trace.h @@ -46,6 +46,12 @@ assign, print, reg, unreg) \ DEFINE_TRACE_FN(name, reg, unreg) +#undef TRACE_EVENT_NOP +#define TRACE_EVENT_NOP(name, proto, args, struct, assign, print) + +#undef DEFINE_EVENT_NOP +#define DEFINE_EVENT_NOP(template, name, proto, args) + #undef DEFINE_EVENT #define DEFINE_EVENT(template, name, proto, args) \ DEFINE_TRACE(name) @@ -102,6 +108,8 @@ #undef TRACE_EVENT_FN #undef TRACE_EVENT_FN_COND #undef TRACE_EVENT_CONDITION +#undef TRACE_EVENT_NOP +#undef DEFINE_EVENT_NOP #undef DECLARE_EVENT_CLASS #undef DEFINE_EVENT #undef DEFINE_EVENT_FN -- 1.8.3.1