linux-kernel - Re: [PATCH v5 2/2] pipe: use __pipe_{lock,unlock} instead of spinlock

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Date:   Mon, 14 Aug 2023 09:47:00 +0100
From:   David Howells <dhowells@...hat.com>
To:     Hongchen Zhang <zhanghongchen@...ngson.cn>
Cc:     dhowells@...hat.com, Alexander Viro <viro@...iv.linux.org.uk>,
        Christian Brauner <brauner@...nel.org>,
        Steve French <stfrench@...rosoft.com>,
        Jens Axboe <axboe@...nel.dk>, David Disseldorp <ddiss@...e.de>,
        Luis Chamberlain <mcgrof@...nel.org>,
        Nick Alcock <nick.alcock@...cle.com>,
        linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org,
        loongson-kernel@...ts.loongnix.cn
Subject: Re: [PATCH v5 2/2] pipe: use __pipe_{lock,unlock} instead of spinlock

Hongchen Zhang <zhanghongchen@...ngson.cn> wrote:

> -	spin_lock_irq(&pipe->rd_wait.lock);
> +	__pipe_lock(pipe);

This mustn't sleep.  post_one_notification() needs to be callable with a
spinlock held.

David