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Wed, 17 Dec 2025 11:44:26 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id M1+PEJqXQmnUbgAAD6G6ig (envelope-from ); Wed, 17 Dec 2025 11:44:26 +0000 Date: Wed, 17 Dec 2025 12:44:23 +0100 From: Jean Delvare To: Peter Zijlstra Cc: LKML Subject: Build breakage caused by the use of UDB Message-ID: <20251217124119.5832bba7@endymion> Organization: SUSE Linux X-Mailer: Claws Mail 4.2.0 (GTK 3.24.43; x86_64-suse-linux-gnu) 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-Transfer-Encoding: 7bit X-Spam-Flag: NO X-Spam-Score: -3.67 X-Spam-Level: X-Spamd-Result: default: False [-3.67 / 50.00]; BAYES_HAM(-2.96)[99.81%]; NEURAL_HAM_LONG(-1.00)[-1.000]; MID_RHS_NOT_FQDN(0.50)[]; NEURAL_HAM_SHORT(-0.11)[-0.557]; MIME_GOOD(-0.10)[text/plain]; RCPT_COUNT_TWO(0.00)[2]; HAS_ORG_HEADER(0.00)[]; ARC_NA(0.00)[]; FUZZY_RATELIMITED(0.00)[rspamd.com]; RCVD_VIA_SMTP_AUTH(0.00)[]; RCVD_TLS_ALL(0.00)[]; DKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519]; TO_DN_ALL(0.00)[]; FROM_HAS_DN(0.00)[]; MIME_TRACE(0.00)[0:+]; FROM_EQ_ENVFROM(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; RCVD_COUNT_TWO(0.00)[2]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:helo] 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. -- Jean Delvare SUSE L3 Support