From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.sleepmap.de (sleepmap.de [85.10.206.218]) (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 C832D389E05 for ; Mon, 20 Jul 2026 08:19:49 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=85.10.206.218 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784535591; cv=none; b=GpOlle83llC3PXb9MBl4jsZNAncmctNhesxjNEs0ExfojLnvmA8gCVBlxz57KnYEtLLdmnPaOvvjceV+HjRFSFbnyuyOzxF/1RkZxyJt5dTBOQBRYqqKTu7bPDI3PutwYoH1nYCJ+bTwx4Z2OaLtBywzjptvGSjw86c86LG3+Es= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784535591; c=relaxed/simple; bh=1TbgDM5VXyNQguZLFZRezxvduvgvJewKkA24GXf388U=; h=Date:From:To:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=dlk7AQTu+1sV3GylZgBPnUzJPXrAzRul1+Tq73MEYITWmE+wNPcBVY8u8SBU6xIqqduswKFFyfXQCDhpxrd/mOsshOY7ik/+kllGxTv52JbQX1PPPecSyd7WEURgi33XsnYQkLEuELIAD2MrlBLjfl3dKzayVkVLl/BkbviCOiE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sleepmap.de; spf=pass smtp.mailfrom=sleepmap.de; dkim=pass (1024-bit key) header.d=sleepmap.de header.i=@sleepmap.de header.b=FhsHwL/T; arc=none smtp.client-ip=85.10.206.218 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=sleepmap.de Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=sleepmap.de Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=sleepmap.de header.i=@sleepmap.de header.b="FhsHwL/T" DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=sleepmap.de; s=RzV2MS86Cdvz; t=1784535259; bh=1TbgDM5VXyNQguZLFZRezxvduvgvJewKkA24GXf388U=; h=Date:From:To:Subject; b=FhsHwL/TEGk5Ta1AHQtGiY06V7N/R0/090TnxrAurpTnYTUALil9tyOdvwR5JrlXR 9OYTa47x9CMStbaZdZtJmz0nPEcoMUh/tQiGo5tHchUw/nSuSo1PCkFobTfBl0lv3a F9X61C4niUoHCWxcKKUwnMsZa3uZMffTzp1QTgtE= Date: Mon, 20 Jul 2026 10:14:02 +0200 From: David Runge To: linux-rt-users@vger.kernel.org Subject: Issues building RT patchset v6.18.13-rt4-rebase on top of v6.18.39 Message-ID: Precedence: bulk X-Mailing-List: linux-rt-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="XFKz5FOPetns2YGr" Content-Disposition: inline --XFKz5FOPetns2YGr Content-Type: text/plain; protected-headers=v1; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Date: Mon, 20 Jul 2026 10:14:02 +0200 From: David Runge To: linux-rt-users@vger.kernel.org Subject: Issues building RT patchset v6.18.13-rt4-rebase on top of v6.18.39 Hi, on Arch Linux we have switched to a rebase workflow to offer the linux-rt [= 1] and linux-rt-lts [2] kernels on latest kernels of the series, so that we can also apply security and regression fixes. For linux-rt-lts and with rebasing v6.18.13-rt4-rebase [3] onto v6.18.39 (a= nd later on applying our own distribution patches) [4], we run into a build fa= ilure though. (The rebase applied cleanly). ``` CC [M] drivers/misc/cardreader/rts5249.o drivers/tty/serial/8250/8250_port.c:3225:7: error: conflicting types for = =E2=80=98serial8250_fifo_wait_for_lsr_thre=E2=80=99; have =E2=80=98void(str= uct uart_8250_port *, struct nbcon_write_context *, unsigned int)=E2=80=99 3225 | void serial8250_fifo_wait_for_lsr_thre(struct uart_8250_port *up, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from drivers/tty/serial/8250/8250_port.c:40: drivers/tty/serial/8250/8250.h:189:6: note: previous declaration of =E2=80= =98serial8250_fifo_wait_for_lsr_thre=E2=80=99 with type =E2=80=98void(struc= t uart_8250_port *, unsigned int)=E2=80=99 189 | void serial8250_fifo_wait_for_lsr_thre(struct uart_8250_port *up, u= nsigned int count); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from ./include/linux/linkage.h:7, from ./include/linux/printk.h:8, from ./include/asm-generic/bug.h:22, from ./arch/x86/include/asm/bug.h:108, from ./arch/x86/include/asm/alternative.h:9, from ./arch/x86/include/asm/barrier.h:5, from ./include/linux/list.h:11, from ./include/linux/module.h:12, from drivers/tty/serial/8250/8250_port.c:14: drivers/tty/serial/8250/8250_port.c:3245:22: error: conflicting types for = =E2=80=98serial8250_fifo_wait_for_lsr_thre=E2=80=99; have =E2=80=98void(str= uct uart_8250_port *, struct nbcon_write_context *, unsigned int)=E2=80=99 3245 | EXPORT_SYMBOL_NS_GPL(serial8250_fifo_wait_for_lsr_thre, "SERIAL_825= 0"); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ =2E/include/linux/export.h:76:28: note: in definition of macro =E2=80=98__E= XPORT_SYMBOL=E2=80=99 76 | extern typeof(sym) sym; \ | ^~~ drivers/tty/serial/8250/8250_port.c:3245:1: note: in expansion of macro =E2= =80=98EXPORT_SYMBOL_NS_GPL=E2=80=99 3245 | EXPORT_SYMBOL_NS_GPL(serial8250_fifo_wait_for_lsr_thre, "SERIAL_825= 0"); | ^~~~~~~~~~~~~~~~~~~~ drivers/tty/serial/8250/8250.h:189:6: note: previous declaration of =E2=80= =98serial8250_fifo_wait_for_lsr_thre=E2=80=99 with type =E2=80=98void(struc= t uart_8250_port *, unsigned int)=E2=80=99 189 | void serial8250_fifo_wait_for_lsr_thre(struct uart_8250_port *up, u= nsigned int count); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ make[6]: *** [scripts/Makefile.build:287: drivers/tty/serial/8250/8250_port= =2Eo] Error 1 make[5]: *** [scripts/Makefile.build:544: drivers/tty/serial/8250] Error 2 make[4]: *** [scripts/Makefile.build:544: drivers/tty/serial] Error 2 make[3]: *** [scripts/Makefile.build:544: drivers/tty] Error 2 make[3]: *** Waiting for unfinished jobs.... ``` The culprit appears to be this commit: 'Reapply "serial: 8250: Switch to nbcon console"' [5] I'm not sure who is currently working on the patchset for the 6.18 LTS bran= ch, but I guess it is worth exploring to drop/adjust the commit and release a n= ew patchset? Is the patch still needed? Best, David [1] https://archlinux.org/packages/extra/x86_64/linux-rt/ [2] https://archlinux.org/packages/extra/x86_64/linux-rt-lts/ [3] https://gitlab.archlinux.org/archlinux/packaging/upstream/linux-rt-lts/= -/commits/v6.18.13-rt4-rebase [4] https://gitlab.archlinux.org/archlinux/packaging/upstream/linux-rt-lts/= -/commits/v6.18.39-rt4-arch1 [5] https://gitlab.archlinux.org/archlinux/packaging/upstream/linux-rt-lts/= -/commit/c5661d54576a9bf12c2fd0eaa2a54baf48e45d4a [6] https://wiki.linuxfoundation.org/realtime/start --XFKz5FOPetns2YGr Content-Type: application/pgp-signature; name=signature.asc -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQR8efy7g3Ll3lsX4JqQ1LlkHgkpcQUCal3YygAKCRCQ1LlkHgkp cdM0AP9i/2Ouw+nhN2hlFH+nyCz5lsmjEr6HebzE0V+GLF0BYQD/UnS2Da03x57z GcidV71UPgVtkP3S2PtvC/zNa/aFcwk= =TphY -----END PGP SIGNATURE----- --XFKz5FOPetns2YGr--