linux-kernel - Re: [PATCH] mm: Make CONFIG_FRAME

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Message-ID: <20190115170510.GA4274@infradead.org>
Date:   Tue, 15 Jan 2019 09:05:10 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Olof Johansson <olof@...om.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Jan Kara <jack@...e.cz>
Subject: Re: [PATCH] mm: Make CONFIG_FRAME_VECTOR a visible option

On Tue, Jan 15, 2019 at 08:44:35AM -0800, Olof Johansson wrote:
> CONFIG_FRAME_VECTOR was made an option to avoid including the bloat on
> platforms that try to keep footprint down, which makes sense.
> 
> The problem with this is external modules that aren't built in-tree.
> Since they don't have in-tree Kconfig, whether they can be loaded now
> depends on whether your kernel config enabled some completely unrelated
> driver that happened to select it. That's a weird and unpredictable
> situation, and makes for some awkward requirements for the standalone
> modules.
> 
> For these reasons, give someone the option to manually enable this when
> configuring the kernel.

NAK, we should not confuse kernel users for stuff that is out of tree.