linux-kernel - Re: [PATCH v1 19/23] cachefiles: implement .demand

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Message-ID: <YcndgcpQQWY8MJBD@casper.infradead.org>
Date:   Mon, 27 Dec 2021 15:36:33 +0000
From:   Matthew Wilcox <willy@...radead.org>
To:     Jeffle Xu <jefflexu@...ux.alibaba.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com, xiang@...nel.org,
        chao@...nel.org, linux-erofs@...ts.ozlabs.org,
        linux-fsdevel@...r.kernel.org, joseph.qi@...ux.alibaba.com,
        bo.liu@...ux.alibaba.com, tao.peng@...ux.alibaba.com,
        gerry@...ux.alibaba.com, eguan@...ux.alibaba.com,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v1 19/23] cachefiles: implement .demand_read() for demand
 read

On Mon, Dec 27, 2021 at 08:54:40PM +0800, Jeffle Xu wrote:
> +	spin_lock(&cache->reqs_lock);
> +	ret = idr_alloc(&cache->reqs, req, 0, 0, GFP_KERNEL);

GFP_KERNEL while holding a spinlock?

You should be using an XArray instead of an IDR in new code anyway.