From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id B7428EB64DC for ; Fri, 21 Jul 2023 06:26:05 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 3643D28019B; Fri, 21 Jul 2023 02:26:05 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 31543280190; Fri, 21 Jul 2023 02:26:05 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 2042B28019B; Fri, 21 Jul 2023 02:26:05 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0010.hostedemail.com [216.40.44.10]) by kanga.kvack.org (Postfix) with ESMTP id 0E7EB280190 for ; Fri, 21 Jul 2023 02:26:05 -0400 (EDT) Received: from smtpin10.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay10.hostedemail.com (Postfix) with ESMTP id DF81BC018E for ; Fri, 21 Jul 2023 06:26:04 +0000 (UTC) X-FDA: 81034633848.10.2A4C45F Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by imf30.hostedemail.com (Postfix) with ESMTP id 2D38680004 for ; Fri, 21 Jul 2023 06:26:02 +0000 (UTC) Authentication-Results: imf30.hostedemail.com; dkim=none; spf=none (imf30.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de; dmarc=none ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1689920763; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=9aLV2SEVbfjUI9alWZzR1TGP+HqucniCNpoaIznlxUg=; b=5F9oGU+o/3ptbPq8Qj8DYkE2UVpUdTY0qBIRk8Dyz+92eMgYBqXIFmitHPOLxPu/wk/mPa wWhhEyl89kugqf40EzzZq3ZlKxE20/kwyaBMswNl+eUieYciZQ7fSQR8/glhyFZMom6NuW GIUEXc4vfJqUluZC7ADdHi7HdGEXTW8= ARC-Authentication-Results: i=1; imf30.hostedemail.com; dkim=none; spf=none (imf30.hostedemail.com: domain of hch@lst.de has no SPF policy when checking 213.95.11.211) smtp.mailfrom=hch@lst.de; dmarc=none ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1689920763; a=rsa-sha256; cv=none; b=IWEtcnMqxUyqFkjKW4uDYsTRLBGTXXhbFzybuM+VHPSKUtxrEPxoYm6QEsHuW6ZfUHumHw Uuf+VC/9YSibd/EZ7XOPy/Ha1LtyNbRT5vC6fu4Ip6R6d1OxFmDaAFAcyK7oOLrCuNBnzX 1povVcp3RErNonp4LX4n3YLSnqeSAGs= Received: by verein.lst.de (Postfix, from userid 2407) id 7D6C168AA6; Fri, 21 Jul 2023 08:25:59 +0200 (CEST) Date: Fri, 21 Jul 2023 08:25:58 +0200 From: Christoph Hellwig To: Hannes Reinecke Cc: Christoph Hellwig , Jens Axboe , "Darrick J. Wong" , Andrew Morton , Matthew Wilcox , Christian Brauner , linux-block@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-xfs@vger.kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH 6/6] fs: add CONFIG_BUFFER_HEAD Message-ID: <20230721062558.GB20845@lst.de> References: <20230720140452.63817-1-hch@lst.de> <20230720140452.63817-7-hch@lst.de> <80507f03-86b4-6406-5ab1-5687b6d12d93@suse.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <80507f03-86b4-6406-5ab1-5687b6d12d93@suse.de> User-Agent: Mutt/1.5.17 (2007-11-01) X-Rspamd-Queue-Id: 2D38680004 X-Rspam-User: X-Stat-Signature: 53aog3jj9h3xyzo7iperh9ptn6ouzxmu X-Rspamd-Server: rspam01 X-HE-Tag: 1689920762-665 X-HE-Meta: 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 gXbcA71o nZct7cr5nJlKewPBJToPVNYQkZRr+6ai0mFGKd06rm4Q4DvEfC+x7Tflch0T3LG3T1hQt8SuZskkzwJTOxw8voc+TgBn1JlePghpe1koq5yIvGmg= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: On Thu, Jul 20, 2023 at 05:53:52PM +0200, Hannes Reinecke wrote: > Can we modify this to not have a compile-time option but rather a setting > somewhere? EG kernel option or flag in struct address_space? Modify what? The current code diables buffer_head suport on the block devices when the kernel does not support buffer_heads. There is no good way to make that a run time decision :)