linux-kernel - Re: [PATCH v2 1/2] fscache: Use wait_on_bit() to wait for the freeing of relinquished volume

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Date:   Wed, 11 Jan 2023 16:06:10 +0000
From:   David Howells <dhowells@...hat.com>
To:     Hou Tao <houtao@...weicloud.com>
Cc:     dhowells@...hat.com, linux-cachefs@...hat.com,
        Jeff Layton <jlayton@...nel.org>, linux-erofs@...ts.ozlabs.org,
        linux-kernel@...r.kernel.org,
        Jingbo Xu <jefflexu@...ux.alibaba.com>, houtao1@...wei.com
Subject: Re: [PATCH v2 1/2] fscache: Use wait_on_bit() to wait for the freeing of relinquished volume

Hou Tao <houtao@...weicloud.com> wrote:

>  			clear_bit(FSCACHE_VOLUME_ACQUIRE_PENDING, &cursor->flags);
> +			/*
> +			 * Paired with barrier in wait_on_bit(). Check
> +			 * wake_up_bit() and waitqueue_active() for details.
> +			 */
> +			smp_mb__after_atomic();
>  			wake_up_bit(&cursor->flags, FSCACHE_VOLUME_ACQUIRE_PENDING);

What two values are you applying a partial ordering to?

David