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Date:   Thu, 21 Oct 2021 04:16:52 -0700
From:   Christoph Hellwig <hch@infradead.org>
To:     Manjong Lee <mj0123.lee@samsung.com>
Cc:     akpm@linux-foundation.org, linux-mm@kvack.org,
        linux-kernel@vger.kernel.org, seunghwan.hyun@samsung.com,
        sookwan7.kim@samsung.com, nanich.lee@samsung.com,
        yt0928.kim@samsung.com, junho89.kim@samsung.com,
        jisoo2146.oh@samsung.com
Subject: Re: [PATCH 1/1] mm: bdi: Initialize bdi_min_ratio when bdi unregister
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References: <CGME20211021072307epcas1p4aa4388c13e71a66e3e1d5f7ee68b5a7f@epcas1p4.samsung.com>
 <20211021161942.5983-1-mj0123.lee@samsung.com>
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On Fri, Oct 22, 2021 at 01:19:43AM +0900, Manjong Lee wrote:
> Because when sdcard is removed, bdi_min_ratio value will remain.
> Currently, the only way to reset bdi_ min_ratio is to reboot.

But bdis that are unregistered are never re-registered.  What is
the problem you're trying to solve?