linux-kernel - Re: [PATCH 0/3] mm/damon: export DAMON symbols and add sample loadable modules

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Message-ID: <ZW6xTyyl0qvcqi3O@infradead.org>
Date:   Mon, 4 Dec 2023 21:12:47 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     SeongJae Park <sj@...nel.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, damon@...ts.linux.dev,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/3] mm/damon: export DAMON symbols and add sample
 loadable modules

On Tue, Dec 05, 2023 at 02:28:55AM +0000, SeongJae Park wrote:
> DAMON cannot be used from loadable modules since it is not exporting its
> symbols.

And that is a good thing.  We should absolutely not allow random modules
probing MM internals.   What you posted here is basically just adding
hooks without even real in-kernel users.