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 Received: from lists.ozlabs.org (lists.ozlabs.org [112.213.38.117]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A4863CDB466 for ; Sun, 21 Jun 2026 23:35:12 +0000 (UTC) Received: from boromir.ozlabs.org (localhost [127.0.0.1]) by lists.ozlabs.org (Postfix) with ESMTP id 4gk73f3mRSz2xyj; Mon, 22 Jun 2026 09:35:10 +1000 (AEST) Authentication-Results: lists.ozlabs.org; arc=none smtp.remote-ip=172.234.252.31 ARC-Seal: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1782047046; cv=none; b=gRm5VlV3MF+Gd9eoJaWXzx8UFMiRGVuZREpDojNaNrtI3jzTsQjd254gMMrUyicc7802h8/wPLo29aSOQ1+3+eA0PC2ktt/q1KFDF35nH39Y34OqQ8OZl+1nSN53urTO/fuQFddeZ1XSF2TPYGWGGpvcj70X8ruz6F5MqCTk8SRKxgcHO+XlTINaIGeJtdGNFBDFLrndEx75dEXm5pLerieIECOhVtCyJwwcVoHcVYBt/hRstHEdYqbd5TSS5R2R7lrNqk8qjwWEIIRrQ8/DWA+F4jNd8kf9rqkrnLBnDnm7g/g8EeuQxx7GzCqarexZsHRfIZyFX7mFTgiIbHqx/w== ARC-Message-Signature: i=1; a=rsa-sha256; d=lists.ozlabs.org; s=201707; t=1782047046; c=relaxed/relaxed; bh=XZ3QL+ViFIRQLIm9wDhWdL0BX/Xy+P2cyftFjHpTXuA=; h=Date:From:To:Cc:Subject:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=fU1/V8+bZ4xaR5Ki8SEv2Huswjc4bH8cZyon+ToPYlZHTHVz6sp+nDJNsvOTnLhqAmIOh17l++tGa3y/24w7DkdkK+kFocBjqijsgxW4+dQdpPbPMk2uUsXpGUnD/12agae5dp9riIL/n9gqEDgh8YeN3+rQDxG+hRrNGEE7+aA3f5h4oJC3qmNJ3birwXAYOidRABANDz3PMI5OK6JQt6BdgGZfYfBKTwELDtDraiCRWBzfjbKGX0CeIa+XctkdizVUbL9ebUJT5LuR92rdMf9MkLXdS3zc59EZRuGMNg2S466pnYbiIeDMH2JzbNaaTPr2MuiEv1q8QgHRIr+W1g== ARC-Authentication-Results: i=1; lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Fov1mXvD; dkim-atps=neutral; spf=pass (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=rostedt@kernel.org; receiver=lists.ozlabs.org) smtp.mailfrom=kernel.org Authentication-Results: lists.ozlabs.org; dmarc=pass (p=quarantine dis=none) header.from=kernel.org Authentication-Results: lists.ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=Fov1mXvD; dkim-atps=neutral Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=kernel.org (client-ip=172.234.252.31; helo=sea.source.kernel.org; envelope-from=rostedt@kernel.org; receiver=lists.ozlabs.org) Received: from sea.source.kernel.org (sea.source.kernel.org [172.234.252.31]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange x25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4gjs3T2fJbz2xQD for ; Sun, 21 Jun 2026 23:04:05 +1000 (AEST) Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) by sea.source.kernel.org (Postfix) with ESMTP id ED7EF43E1A; Sun, 21 Jun 2026 13:04:02 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 436C81F000E9; Sun, 21 Jun 2026 13:03:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1782047042; bh=XZ3QL+ViFIRQLIm9wDhWdL0BX/Xy+P2cyftFjHpTXuA=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=Fov1mXvDuGCK2T8sN6e2OfQHKCECHfbpGXRBBqt0mJumjJ/lQbWWgN+HJ+/A1VLw+ e5YBQ183dvuJj8bkhkLpBwxFrOxwQLVALwfGN8E1vAdvSrax2YUe76xVCjK7uPwOFi 8L8TB9EiAaEyP+6x5OTgJet8aZiHBkKPALBPE4+VYsqKVHMeJsBx9VwREe4epBtPeP n9K1YBwfMVRT70tbP5fJHUITXTsn/07OQJHxOY03KDzngCMaGRvGI98OxNWNIGSt1/ pUwueEV4G7f1R4ZCP/PbFKS6BI+0tZTyLgw9UhMTaK5YsTglkNBetTBg7DaYsXC78p S9lKpmXhld3Cw== Date: Sun, 21 Jun 2026 09:03:53 -0400 From: Steven Rostedt To: David Laight Cc: Thomas Gleixner , linux-kernel@vger.kernel.org, linux-trace-kernel@vger.kernel.org, Masami Hiramatsu , Mark Rutland , Mathieu Desnoyers , Andrew Morton , Linus Torvalds , Sebastian Andrzej Siewior , John Ogness , Peter Zijlstra , Julia Lawall , Yury Norov , linux-doc@vger.kernel.org, linux-kbuild@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, dri-devel@lists.freedesktop.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-rdma@vger.kernel.org, linux-usb@vger.kernel.org, linux-ext4@vger.kernel.org, linux-nfs@vger.kernel.org, kvm@vger.kernel.org, intel-gfx@lists.freedesktop.org Subject: Re: [PATCH 2/2] tracing: Add CONFIG_TRACE_PRINTK_DEBUGGING to clean up kernel.h Message-ID: <20260621090353.24772584@fedora> In-Reply-To: <20260621135531.243375d9@pumpkin> References: <20260621093430.264983361@kernel.org> <20260621093811.168514984@kernel.org> <87ik7cmcb7.ffs@fw13> <20260621135531.243375d9@pumpkin> X-Mailer: Claws Mail 4.4.0 (GTK 3.24.52; x86_64-redhat-linux-gnu) X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit On Sun, 21 Jun 2026 13:55:31 +0100 David Laight wrote: > Indeed... > Isn't trace_printk() just an extern? > Having it defined somewhere isn't going to make any difference to build times. No it is not. It is a macro to cut as many nanoseconds as possible as trace_printk() was created to debug tight race conditions and any added latency can make the race go away. -- Steve