linux-kernel - Re: [PATCH v5 2/5] Revert "frontswap: simplify frontswap_register

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Message-ID: <20220927123130.GA5549@lst.de>
Date:   Tue, 27 Sep 2022 14:31:30 +0200
From:   Christoph Hellwig <hch@....de>
To:     Liu Shixin <liushixin2@...wei.com>
Cc:     Christoph Hellwig <hch@....de>,
        Seth Jennings <sjenning@...hat.com>,
        Dan Streetman <ddstreet@...e.org>,
        Vitaly Wool <vitaly.wool@...sulko.com>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Nathan Chancellor <nathan@...nel.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Kefeng Wang <wangkefeng.wang@...wei.com>
Subject: Re: [PATCH v5 2/5] Revert "frontswap: simplify
 frontswap_register_ops"

On Tue, Sep 27, 2022 at 07:12:58PM +0800, Liu Shixin wrote:
> If not do this, while some user enable swap device first and then enable zswap,
> zswap will not take effect. The user need to re-enable the swap device which is
> inconvenient.

So load the module before swapping on, just like you'd load any driver
before you expect to use it.