From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (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 544563783B1; Thu, 23 Apr 2026 16:29:05 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776961747; cv=none; b=mmvSk2uqffH2kVwXeCb4s72RCxjFJEuFX9ZPzeOdivn3n3KCBBeG26qPCxdAbGzJQPVPOLZgiLfIyICg2D8nPXjjohesKZGHa/WMHovOnlu+u5nb2/Fnl9JuxK76Wcw6tzpfRFYbifrNdcvmuX+da72ALsRiQYWB0LhqmWUsrGM= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776961747; c=relaxed/simple; bh=yTDft1bjK9Ndz3SbAethx49RRrBo8V21uI8sdOBK7G0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=KeIS/T9buNXsD2ppPuz/q2GJ/9V/PAAo19ECBfDYUM6pFKtRM+2YaoEDf2xx0WEg45sL0DVVj11Pbjy3MwilXlTKxTC5zWr7gWN13xlMd4963npwAXlqWIg+lAC6EIIOUipGY80GUhNglMQuEt6a6OcT9T7i+7xXzubJ9FwkvZU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=doxoulaP; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="doxoulaP" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; 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=bSNXi6++adOUxDdiKHQeejGWmSJ+dhIwo0tBAHZhjTo=; b=doxoulaP+yhTSmPjFKEVwj8saG Be/7RKNG9i53Il8PDZDnr1Lys/e/blHVId3MSPKbh+6EuHvvQJtkN5UhdQ4xfguMv8oOL8mrofrFf sStS4gz0RuAau6Lroly2H3z6lUOO02keKAC67q0dOHq8SLPdl5geoJ/LSI74w++N6DEnw7ZGmvYQR T3zHv4ZbupS8eYd1/jeUnyptgDr8QS58vWCiqYT0mJ8AGCHZeaZLnZX34M8U9FnDXGkLNRqToQIcf C4zGbBSmis6g2WABpYpXnXCAknBNbT02tNMfNYV1s6z/O/NbYmnKfAXw7uULyTZWGQQEItR2XhmI5 d8CM8+Tw==; Received: from 2001-1c00-8d85-4b00-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:4b00:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1wFwvH-0000000DjKw-00sL; Thu, 23 Apr 2026 16:29:03 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 8873E300E8B; Thu, 23 Apr 2026 18:29:02 +0200 (CEST) Date: Thu, 23 Apr 2026 18:29:02 +0200 From: Peter Zijlstra To: Josh Poimboeuf Cc: x86@kernel.org, linux-kernel@vger.kernel.org, live-patching@vger.kernel.org, Joe Lawrence , Song Liu , Miroslav Benes , Petr Mladek Subject: Re: [PATCH 45/48] x86/Kconfig: Enable CONFIG_PREFIX_SYMBOLS for FineIBT Message-ID: <20260423162902.GC641209@noisy.programming.kicks-ass.net> References: <70107aab81b01f8a2360f052ff550a9e97c30f79.1776916871.git.jpoimboe@kernel.org> <20260423084758.GY3126523@noisy.programming.kicks-ass.net> <20260423151925.GG1064669@noisy.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: live-patching@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: On Thu, Apr 23, 2026 at 09:23:12AM -0700, Josh Poimboeuf wrote: > > > Sorry, how do you get 64 here? > > > > DEBUG_FORCE_FUNCTION_ALIGNMENT_64B=y > > Ok, so in that case it would be 5-byte cfi symbol and 59-byte NOP gap. > Or a 64-byte pfx for the !CFI case. Just so.