From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) (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 346C52F7AD8 for ; Fri, 10 Oct 2025 15:12:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=170.10.133.124 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760109133; cv=none; b=W3Co+V1EWObGj/23f4Sz0Km5QaenIrZi4lzfy5gUYtIT9IvjRub5/fmBt3+pUoLhHVRW7WJZJQGezA1CmQyQC3GIfOkUM3BxtLqxKXYt81W4651exkKHNoHHxHlSO7gDeVqCq9/c0Dida8M3icntyRIwsSqL/ahsJlAO6PaKhqs= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760109133; c=relaxed/simple; bh=WIkXLM1r7Q1O7LPVjMvifve9AQ66MNpnx4ZqY/8T61M=; h=Date:From:To:cc:Subject:In-Reply-To:Message-ID:References: MIME-Version:Content-Type; b=V1a5phTT0IqfDjFx9liasDfrDgtW9PpE2KTT17CsDPqzrDHjlOIpXKohcT3f2hLRE6Rb7uR7BvJ8m6GRk3spwHHAy2qx6Lf4k6ujkpxvwhLCb6Djq838juk+8BOW+Leq2LwPj7iXznZEz+Rd4ic77THRVWgkUyLUoNcaCY99GlE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com; spf=pass smtp.mailfrom=redhat.com; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b=EFbjDWdR; arc=none smtp.client-ip=170.10.133.124 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=redhat.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=redhat.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=redhat.com header.i=@redhat.com header.b="EFbjDWdR" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1760109131; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: in-reply-to:in-reply-to:references:references; bh=qHCdZi6C7ELhvkHmBE99ONw5f0wTBtemnyHf1SDAuNY=; b=EFbjDWdRcyA56fcCXLlK55h9E3lF8+aaPpuezJ3m8xCbpG8nvC84G1In9Fw5sAAwnh5TOA j1uR/hWS4BZizbbdUAbY71dqCRZevxe1COCLcKqZiBFeGVxWfLrcaBsjV7GooSi4PkNH5L xGLmsKSlOdWJDRiSh11L1v5DjBebQAs= Received: from mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (ec2-35-165-154-97.us-west-2.compute.amazonaws.com [35.165.154.97]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-266-5gxgZ7HqORGcbXAp1Yrqxg-1; Fri, 10 Oct 2025 11:12:07 -0400 X-MC-Unique: 5gxgZ7HqORGcbXAp1Yrqxg-1 X-Mimecast-MFC-AGG-ID: 5gxgZ7HqORGcbXAp1Yrqxg_1760109125 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-08.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id B964918005BF; Fri, 10 Oct 2025 15:12:03 +0000 (UTC) Received: from [10.45.224.32] (unknown [10.45.224.32]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id E0D821955F42; Fri, 10 Oct 2025 15:11:56 +0000 (UTC) Date: Fri, 10 Oct 2025 17:11:49 +0200 (CEST) From: Mikulas Patocka To: Thomas Zimmermann cc: Helge Deller , sukrut heroorkar , David Hunter , kernel test robot , Bernie Thompson , Arnd Bergmann , Randy Dunlap , Bartosz Golaszewski , Zsolt Kajtar , Gonzalo Silvalde Blanco , linux-fbdev@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, llvm@lists.linux.dev, oe-kbuild-all@lists.linux.dev, skhan@linuxfoundation.org Subject: Re: [PATCH] fbdev: udlfb: make CONFIG_FB_DEVICE optional In-Reply-To: <6b1f8366-7ec8-4c1f-9563-29e06a8060e2@suse.de> Message-ID: References: <20250924175743.6790-1-hsukrut3@gmail.com> <202509272320.3K8kdDCw-lkp@intel.com> <41ef536d-2399-43f8-8041-c6b0e642aba2@suse.de> <6b1f8366-7ec8-4c1f-9563-29e06a8060e2@suse.de> Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/mixed; BOUNDARY="-1463811712-636264779-1760108298=:3315052" Content-ID: X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. ---1463811712-636264779-1760108298=:3315052 Content-Type: text/plain; CHARSET=UTF-8 Content-Transfer-Encoding: 8BIT Content-ID: <77da2ba4-763b-3169-d87c-f655b00b6162@redhat.com> On Tue, 7 Oct 2025, Thomas Zimmermann wrote: > Hi > > Am 03.10.25 um 21:50 schrieb Helge Deller: > > On 10/3/25 20:43, sukrut heroorkar wrote: > > > On Thu, Oct 2, 2025 at 8:52 AM Thomas Zimmermann > > > wrote: > > > > Am 02.10.25 um 08:41 schrieb Helge Deller: > > > > > > > > kernel test robot noticed the following build errors: > > > > > > > > > > > > > > Did you compile and test this code before submitting this patch? > > > > > > > > > > > > Yes, I had compiled & loaded the udlfb module with no errors. Please > > > > > > let me know how to proceed in this case. > > > > > > > > > > Look at the reported build error, which seems to happen in dev_dbg(). > > > > > So, maybe in your testing you did not have debugging enabled? > > > > > The report contains the .config file with which you can test. > > > > > > > > Can we rather make an effort to remove the udlfb driver entirely? A few > > > > years back, there was one user who was still using it because of some > > > > problems with the DRM udl driver. But I think we've addressed them. The > > > > discussion is at [1]. It was me - and I am still using it on an ARM64 MacchiatoBIN board because the board doesn't have graphics output. The problems with the UDL DRM driver were: * crashes with full-screen framebuffer applications, such as "links2 -g", "fbi" or "fbgs". On UDLFB, there are no crashes. * worse performance - the UDL DRM driver updates everything in a given rectangle, while the UDLFB driver keeps back-buffer and front-buffer and updates only differences between them. * crash when you unplug the card while Xorg was running (already fixed) Mikulas ---1463811712-636264779-1760108298=:3315052--