linux-ext4 - Re: [PATCH v8 4/4] fs: unicode: Add utf8 module and a unicode layer

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Date:   Tue, 27 Apr 2021 07:29:07 +0100
From:   Christoph Hellwig <hch@...radead.org>
To:     Shreeya Patel <shreeya.patel@...labora.com>
Cc:     tytso@....edu, adilger.kernel@...ger.ca, jaegeuk@...nel.org,
        chao@...nel.org, krisman@...labora.com, ebiggers@...gle.com,
        drosen@...gle.com, ebiggers@...nel.org, yuchao0@...wei.com,
        linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-fsdevel@...r.kernel.org, kernel@...labora.com,
        andre.almeida@...labora.com
Subject: Re: [PATCH v8 4/4] fs: unicode: Add utf8 module and a unicode layer

On Sat, Apr 24, 2021 at 02:21:36AM +0530, Shreeya Patel wrote:
> utf8data.h_shipped has a large database table which is an auto-generated
> decodification trie for the unicode normalization functions.
> We can avoid carrying this large table in the kernel unless it is required
> by the filesystem during boot process.
> 
> Hence, make UTF-8 encoding loadable by converting it into a module and
> also add built-in UTF-8 support option for compiling it into the
> kernel whenever required by the filesystem.

The way this is implemement looks rather awkward.

Given that the large memory usage is for a data table and not for code,
why not treat is as a firmware blob and load it using request_firmware?