linux-kernel - Re: [PATCH 6/6] fs: add CONFIG_BUFFER

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Message-ID: <20230721062558.GB20845@lst.de>
Date:   Fri, 21 Jul 2023 08:25:58 +0200
From:   Christoph Hellwig <hch@....de>
To:     Hannes Reinecke <hare@...e.de>
Cc:     Christoph Hellwig <hch@....de>, Jens Axboe <axboe@...nel.dk>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Christian Brauner <christian@...uner.io>,
        linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 6/6] fs: add CONFIG_BUFFER_HEAD

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 :)