From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from desiato.infradead.org (desiato.infradead.org [90.155.92.199]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 93F792DBF69 for ; Wed, 24 Sep 2025 10:15:57 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.92.199 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758709170; cv=none; b=mBF5PsJsQST1of2FNJ8wRx6Ky5dl0iTJRoc9vrczQ4ydySptAEhzX6BMCAC3g0o4sSUMqDLHQcUmFoDg9Z0puEqnDB//n0Bre5Ez1V9v5tW0vmghEablLnARWzzgoGRnfrh+e0OuDkQjn3OA+n0DmLjdqOiMkZCvZzLsQ7iTTSc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1758709170; c=relaxed/simple; bh=aLD11utVK0Afx84XbSCjZ0XlW7eTV1MmaHA5baYQatY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JHyjA5mWOabo9ZW3EybZPhlmeHhF7sLWQkHROVZJXVASlK/KyRFYR/d98bfvRYKQ819AvrdxyhbTpeIRYIJhs5EYr2SBHqNsflYM4PJhGjUWZojqUASnF0j1y61HyYNnFdxlqm6qiZgrQATsFoVAuXz2riLyfoapNLzpTsYbx1g= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=ghscz7Eb; arc=none smtp.client-ip=90.155.92.199 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="ghscz7Eb" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=GULcH47ok0t2Xg1AsPuO/xZ9L5b873EalUMP2bFcLlI=; b=ghscz7EbRGtLH1MmbPPyDhnW79 i34aaxsIGMOF8oTjJLF6YWsL0xBWTNDLNVGopbLzPWv+mvKmVe5+A96sWdXpwar9ZZlgDwbJDrIlk w1qqMcJecnXC6XDbbvE1qPZIQgq42AlxmH9Y3s8iS5n+Y7l47sZi1vPrzMg6G3ClkR/s+UNKZNlYA mdfhN4GRDIN18mML9GUsegyTlOY/OV7/jyPf4xoQOymLhywsB92kaFm46/GXv1ReZsgP3F6uApyc7 N2GIO1xSmIkDkTgLFOOhD6LIu3n8/0wwQqu7cecmG3nIylreSm8WrIWeBq97Rl4mbtfGMjK51S7pW TcMo6b3w==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by desiato.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1v1MSN-00000008ijs-3vh8; Wed, 24 Sep 2025 10:10:40 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id EF70C3001F0; Wed, 24 Sep 2025 12:10:38 +0200 (CEST) Date: Wed, 24 Sep 2025 12:10:38 +0200 From: Peter Zijlstra To: Alexandre Chartre Cc: linux-kernel@vger.kernel.org, mingo@kernel.org, jpoimboe@kernel.org Subject: Re: [RFC PATCH v2 00/17] objtool: Function validation tracing Message-ID: <20250924101038.GZ4068168@noisy.programming.kicks-ass.net> References: <20250619145659.1377970-1-alexandre.chartre@oracle.com> <20250924073649.GT4067720@noisy.programming.kicks-ass.net> <20250924074206.GW4068168@noisy.programming.kicks-ass.net> <20250924100847.GY4068168@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20250924100847.GY4068168@noisy.programming.kicks-ass.net> On Wed, Sep 24, 2025 at 12:08:47PM +0200, Peter Zijlstra wrote: > On Wed, Sep 24, 2025 at 09:42:06AM +0200, Peter Zijlstra wrote: > > > > > d051: perf_get_x86_pmu_capability+0x51 | xchg %ax,%ax > > That libopcode is 'funny', isn't that typically spelled "nop" ? Ooh, I see, it is "osp nop" and yeah binutils also seems to do that as "xchg %ax,%ax".