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Date: Tue, 18 Jun 2024 07:52:53 +0200
From: Christoph Hellwig <hch@lst.de>
To: Barry Song <21cnbao@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>,
	Andrew Morton <akpm@linux-foundation.org>,
	Trond Myklebust <trondmy@kernel.org>,
	Anna Schumaker <anna@kernel.org>, Steve French <sfrench@samba.org>,
	linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
	linux-mm@kvack.org, Barry Song <v-songbaohua@oppo.com>,
	Ryan Roberts <ryan.roberts@arm.com>
Subject: Re: [PATCH] nfs: fix nfs_swap_rw for large-folio swap
Message-ID: <20240618055253.GA27945@lst.de>
References: <20240614100329.1203579-1-hch@lst.de> <20240614100329.1203579-2-hch@lst.de> <20240614112148.cd1961e84b736060c54bdf26@linux-foundation.org> <CAGsJ_4wnWzoScqO9_NddHcDPbe_GbAiRFVm4w_H+QDmH=e=Rsw@mail.gmail.com> <20240616085436.GA28058@lst.de> <CAGsJ_4ytrnXJbfVi=PpTw34iBDqEoAm3b16oZr2VQpVWLmh5zA@mail.gmail.com> <20240617053201.GA16852@lst.de> <CAGsJ_4xQgY4kn46NO2=OWh2oDUj2F1-oYCRnKG4KCPJFfBT=Ng@mail.gmail.com>
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User-Agent: Mutt/1.5.17 (2007-11-01)

On Mon, Jun 17, 2024 at 08:02:47PM +1200, Barry Song wrote:
> I did everything the same as above,
> but always got failure at the last step to swapon:
> /mnt/test # swapon swapfile
> swapon: /mnt/test/swapfile: swapon failed: Invalid argument

You are probably missing

CONFIG_NFS_SWAP=y

in your .config.