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 0B93417B425 for ; Wed, 17 Dec 2025 12:35:39 +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=1765974944; cv=none; b=lj3so4PA8I0AoXVrv7G8Q5fJVPprdOgTN/FfhfBR23T3aHCNzAYOCjkMKaH9aZCQgdp9Vz+C8iyLN27uVWLAxkZn3/+gxnJMdorBLTG8RUBt1O2F4LF+qcsz2tgujhzWH/2isfl0+fBopEybZSQfj7X/wDqcSRCXvMNZrzqlZsA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1765974944; c=relaxed/simple; bh=Y+E+HiYclT7sYxfls/OOMT47jqhadlipA/OkazIBtsE=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=ZhtVPJoIegS5Puirt8YLGIU2SKit/qR/CKAHMwSIwDRDIzQ/m7koLVWmO7jW/XVDoTl0I7XUMMmX2I2Vqs/ef/yyLHDXxQAcuvS5KsIXcYXsU7Wqvmuxmmd26Ow3Z2sWlMaEmJPFine6Kk8cPTJVcfko47axUMATqGBvBwsDVWo= 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=l3gPJK2E; arc=none smtp.client-ip=90.155.92.199 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="l3gPJK2E" 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=SD7lXQ8NWWdNiudiackfsuXKV2UyjddWqcUm3DPruAM=; b=l3gPJK2Eg9Li8LFKcW3H5OLBkj 9/a+0bSPbvsOXIi4JEW+qrlW57odDH8O0TvhFvIqve6dOMC6UcU8LIJE4/ttW6RLvN6ZKQmznHGF2 oSoQmJg1RfZK/F3Ezxouc+opiUGAyesz6mYtxYv29An2/T7ndbbg8fRqC3ralnaFkxocdorQex8ka 46m3dr4aE0DUDN4IaaN0PtSE+OjSF6uVWs3rkwkEpHQUPQmWrlC/BfNdPQjjyejqJ+KU1wSXsFdUM ATTof/aQ5SH1USWZCP+8OOJc2SRtRd93NZYE+NmAs/LKfR72AZDjiu+x/yywWCt8YV/KPs+gVWLhd uhkaVttQ==; 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 1vVptH-00000006l0D-0lms; Wed, 17 Dec 2025 11:40:23 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 82B913005E0; Wed, 17 Dec 2025 13:35:36 +0100 (CET) Date: Wed, 17 Dec 2025 13:35:36 +0100 From: Peter Zijlstra To: Jean Delvare Cc: LKML Subject: Re: Build breakage caused by the use of UDB Message-ID: <20251217123536.GE3707891@noisy.programming.kicks-ass.net> References: <20251217124119.5832bba7@endymion> 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: <20251217124119.5832bba7@endymion> On Wed, Dec 17, 2025 at 12:44:23PM +0100, Jean Delvare wrote: > Hi Peter, > > Kernel v6.18.1 doesn't build on x86_64 for me. The build failure is: > > make[1]: Entering directory '/home/khali/src/linux-6.18/drivers/net/wireless/realtek/rtlwifi/rtl8192c' > CC [M] main.o > CC [M] dm_common.o > CC [M] fw_common.o > CC [M] phy_common.o > CHECK main.c > fw_common.c: Assembler messages: > fw_common.c:416: Error: unknown pseudo-op: `.byte0x0f' > fw_common.c:391: Error: unknown pseudo-op: `.byte0x0f' > make[3]: *** [/home/khali/src/linux-6.18/scripts/Makefile.build:287: fw_common.o] Error 1 > make[3]: *** Waiting for unfinished jobs.... > CHECK dm_common.c > phy_common.c: Assembler messages: > phy_common.c:58: Error: unknown pseudo-op: `.byte0x0f' > phy_common.c:67: Error: unknown pseudo-op: `.byte0x0f' > ../wifi.h:3033: Error: unknown pseudo-op: `.byte0x0f' > ../wifi.h:3033: Error: unknown pseudo-op: `.byte0x0f' > phy_common.c:807: Error: unknown pseudo-op: `.byte0x0f' > phy_common.c:714: Error: unknown pseudo-op: `.byte0x0f' > make[3]: *** [/home/khali/src/linux-6.18/scripts/Makefile.build:287: phy_common.o] Error 1 > make[2]: *** [/home/khali/src/linux-6.18/Makefile:2010: .] Error 2 > make[1]: *** [/home/khali/src/linux-6.18/Makefile:248: __sub-make] Error 2 > make[1]: Leaving directory '/home/khali/src/linux-6.18/drivers/net/wireless/realtek/rtlwifi/rtl8192c' > make: *** [Makefile:248: __sub-make] Error 2 > > I bisected it down to: > > commit 85a2d4a890dce3cfc9c14aa91afc3dd7af8e3bf5 > Author: Peter Zijlstra > Date: Mon Sep 1 12:49:58 2025 +0200 > > x86,ibt: Use UDB instead of 0xEA > > Reverting this commit allows me to build v6.18.1. > > I must confess this is all way beyond me and I have no idea how this > change can cause such a build failure, but it does. If it matters, my > compiler is gcc 8.2.1. Well, that is somewhat unexpected. None of the build robots fingered this. Is there a particular .config I should try? I don't seem to have 8.2.1 at hand, but I'll try with 8.3.0.