From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail.thorsis.com (mail.thorsis.com [217.92.40.78]) (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 148FD224B1E for ; Tue, 2 Sep 2025 06:00:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=217.92.40.78 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756792828; cv=none; b=Rsa7BNECWDfTM0ojXJZTWgr7crqA8e/ZoO42F2VrEkEbRJLAj/Zu713pk9j/AmNCFwNj6T1MyxCGmVeREPAdjFNQJ9T1JgzCw85xYJzYMfv82p2Uh2wRq+Ft49o//435bbeP7X0Qxa9UEz3/WpqYi7qR8IU8PKLE3fu9RyjbAIA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756792828; c=relaxed/simple; bh=/nCt3yYubsqf0KYHoUtLdkp0TQwTvmkyUbrTyciVsvc=; h=Date:From:To:Cc:Subject:Message-ID:MIME-Version:Content-Type: Content-Disposition; b=HTxrsothHarDlAiTM9q10UlSqgTluI9K2vQ2lhoBLtdXW64w4HPIdn1bTrV8rqTqxZl61MwqnKfGMpUNdqdoXfCf11Qa77bvo/wKwQH4BtBoDTiv+3bYLzB25wXrRIzhzpssaXF8wpzEv9/Zzje/neq+Z+bg+G32bf/q3maRBBs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=thorsis.com; spf=pass smtp.mailfrom=thorsis.com; dkim=pass (2048-bit key) header.d=thorsis.com header.i=@thorsis.com header.b=fxlPIQ7x; arc=none smtp.client-ip=217.92.40.78 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=quarantine dis=none) header.from=thorsis.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=thorsis.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=thorsis.com header.i=@thorsis.com header.b="fxlPIQ7x" Received: from [127.0.0.1] (localhost [127.0.0.1]) by localhost (Mailerdaemon) with ESMTPSA id 790BB14807F6; Tue, 2 Sep 2025 08:00:16 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=thorsis.com; s=dkim; t=1756792816; h=from:subject:date:message-id:to:cc:mime-version:content-type; bh=/+fDJbS7gRZJNUAGRDP5IS2JtRY0a2+P5vA2nvVqsWA=; b=fxlPIQ7xNAv1G/CNB9CsJYRDIGRjirfueZNta3gLCMc9c+Vj2f44ZlZfm/ookhAsfp6Nud TnDpkXXLaZtl4ZSCW+6CWxV/MxGUmysVHoTtfaKobIaVNKFXaiG/SlEp3NoV02ejNIyP3I 2sjnMB+DdL0QrG6a+SLa4ZzjVSgKLfDKIe30NE9KFKtlfcDvavXvCWss0TyHwIxQU+1xE6 JqZDY+A7oHk5eKqM/Fz7Qypur2eE6bS7U3PUIieClhmaEQkEx0pIkDLGiCpPtHCpjZKvgv sIDsXhw6dduyezmAdZMTjJ5dwo+97jVdzaf6iXsmTsTtWo3+xBJ4EjswrzPBrw== Date: Tue, 2 Sep 2025 08:00:11 +0200 From: Alexander Dahl To: linux-mtd@lists.infradead.org Cc: linux-kernel@vger.kernel.org Subject: State of the UBI fastmap feature Message-ID: <20250902-yarn-from-020874b4da63@thorsis.com> Mail-Followup-To: linux-mtd@lists.infradead.org, linux-kernel@vger.kernel.org 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 User-Agent: Mutt/2.2.12 (2023-09-09) X-Last-TLS-Session-Version: TLSv1.3 Hello everyone, after using UBI for almost 15 years now without fastmap, I'm currently experimenting with that feature. The help text in Kconfig menu (drivers/mtd/ubi/Kconfig) still says "Experimental feature" and further down: > Important: this feature is experimental so far and the on-flash > format for fastmap may change in the next kernel versions Is this still the current state? I can not remember seing any patches touching fastmap in the last time. Are there plans to stabilize this? Will there be changes in the on-flash format? Do folks even use this feature? In production? Happy to get some opinions here. Greets Alex