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Date:   Fri, 4 Aug 2023 12:22:18 +0200
From:   Christoph Hellwig <hch@lst.de>
To:     Matthew Wilcox <willy@infradead.org>
Cc:     kernel test robot <lkp@intel.com>,
        Andrew Morton <akpm@linux-foundation.org>,
        Linux Memory Management List <linux-mm@kvack.org>,
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        Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>
Subject: Re: [linux-next:master] BUILD REGRESSION
 fb4327106e5250ee360d0d8b056c1eef7eeb9a98
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On Thu, Aug 03, 2023 at 09:02:29PM +0100, Matthew Wilcox wrote:
> I think something like this would fix it.  Jens?  Christoph?
> 
> +++ b/fs/romfs/Kconfig
> @@ -2,6 +2,7 @@
>  config ROMFS_FS
>         tristate "ROM file system support"
>         depends on BLOCK || MTD
> +       select BUFFER_HEAD
>         help
>           This is a very small read-only file system mainly intended for
>           initial ram disks of installation disks, but it could be used for
> 
> romfs has a few options and I spent no time looking at this closely;
> maybe not every version of romfs needs buffer heads.

It only needs buffer_heads for the block based path.  I'll send a patch
for it.