linux-kernel - Re: [PATCH v2] kbuild: allow symbol whitelisting with TRIM_UNUSED

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Message-ID: <20200205115331.GA74296@google.com>
Date:   Wed, 5 Feb 2020 11:53:31 +0000
From:   Quentin Perret <qperret@...gle.com>
To:     Matthias Maennich <maennich@...gle.com>
Cc:     masahiroy@...nel.org, nico@...xnic.net,
        linux-kernel@...r.kernel.org, linux-kbuild@...r.kernel.org,
        kernel-team@...roid.com, jeyu@...nel.org
Subject: Re: [PATCH v2] kbuild: allow symbol whitelisting with
 TRIM_UNUSED_KSYMS

On Tuesday 04 Feb 2020 at 14:44:15 (+0000), 'Matthias Maennich' via kernel-team wrote:
> That definitely looks like I would expect that config option to work.

Good, thank you, I'll send an update.

And while at it, I realized we could actually pre-populate autoksyms.h
very early on with the content of the whitelist instead of having it
empty. That way, there's a whole lot of things that will be compiled
'correctly' from the start (that is, adjust_autoksyms.sh won't need to
re-compile them later on). And in fact, if all symbols used by in-tree
modules happen to already be on the whitelist, you'll build a trimmed
kernel in a single pass, which should improve build time a bit I hope.

I'll add something to v3 in addition to your suggestion.

Thanks,
Quentin