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 5CFD6212F89 for ; Thu, 18 Dec 2025 10:38:57 +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=1766054339; cv=none; b=l5yk96QO8pwEy2ebQYHAYp3VckI23FAd9cf//FkqiSirikEjvKWrSIop0AoP2xYYr9DP07Xb3WImRYcWWupUbzmJYAwlfWo9ZaNaOuN44/+zrmqoPnSY7IImJ/ZU0xgsIsp6/R5lmyX1a16Kj3PCE0Uq4YOnofMU3zjvWnhNb+o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766054339; c=relaxed/simple; bh=LDavXwAwAlfQL3PuZQff/R843i9eOfFg3ci5+UjtQK0=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=PXHP/yJy5CE/ZpYWC1YR56Qj9AloRxGyvBwe14J0EBln/uao4WO+PVdcIyXKJHLlCTerL7zvDnl6wdTbXBWKk94/0/opzsJaDhMHlDsJG79nWp01LBGLj0TM/hdno9sQSstVSjJldjFTSEsF7y02pwbn6MLADCeUoGl6BBWSCNk= 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=pDQwg6GR; 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="pDQwg6GR" 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=x2z+4TqnLfqRAaTnscMhs6EsuFXZTDJ2HpPDfZeGW3M=; b=pDQwg6GRUUEnjyiiat8rPZl+U9 e6R7sFIXxqL38gyF3+Z02xErLyOCM2hKp60o+kMfXCVfolIya+hU9/5L0byLljPeURDfeE9i8HvNN ZSQWF5ZW0v5lDDG+YUaHcDDh+VLELDvARovYwbVdt+DD0fDei5UqkeDun+ClyeEoo8NdhdpnpgjHN GZehfS11EwXvZgM/643xwm5/A0mzOTjo2i5V3u90AUPLKgHmH3ynv1cCfH+1Z3r7YGBc7quTVlsND /mFAxZymdqYUsGsHAH5DvARQLzruF890IGKnfEsvWDV+xR2jCJCqo/39tiDS1no6MLmKKyiEMextM ZKM/B4nw==; Received: from 2001-1c00-8d85-5700-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:5700:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vWBPK-000000060J2-1yXS; Thu, 18 Dec 2025 10:38:55 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id F3E06300578; Thu, 18 Dec 2025 11:38:53 +0100 (CET) Date: Thu, 18 Dec 2025 11:38:53 +0100 From: Peter Zijlstra To: Uros Bizjak Cc: Jean Delvare , LKML , Josh Poimboeuf , ardb@kernel.org, Linus Torvalds , x86@kernel.org Subject: Re: Build breakage caused by the use of UDB Message-ID: <20251218103853.GS3911114@noisy.programming.kicks-ass.net> References: <20251217124119.5832bba7@endymion> <20251217123536.GE3707891@noisy.programming.kicks-ass.net> <20251217124713.GD3708021@noisy.programming.kicks-ass.net> <20251217130204.GE3708021@noisy.programming.kicks-ass.net> <20251217133431.GF3708021@noisy.programming.kicks-ass.net> <20251218085447.GJ3707891@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: On Thu, Dec 18, 2025 at 11:26:13AM +0100, Uros Bizjak wrote: > I see... OTOH, a trivial solution would be to just use "ud2" mnemonic, > as proposed in [1]. > > [1] https://lore.kernel.org/lkml/20250909100038.1709394-1-ubizjak@gmail.com/ Yes, there is that. I suppose I worry about all the other _ASM_BYTES users, but since they don't actually show miscompilation, perhaps I should not worry. Let me do a build with just using ud2 instead.