linux-kernel - kconfig: list unknown symbols in the old .config

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Message-ID: <20230816124221.GH907732@google.com>
Date:   Wed, 16 Aug 2023 21:42:21 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Masahiro Yamada <masahiroy@...nel.org>
Cc:     Tomasz Figa <tfiga@...omium.org>, linux-kbuild@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: kconfig: list unknown symbols in the old .config

Hi,

We recently were hit (unnecessarily hard) when after kernel uprev we
figured that something wasn't working. The root cause was a rename of
the CONFIG_FOO option between kernel releases, which make oldconfig
doesn't warn/notify about.

Would it be possible to add either a new --listunknown mode to conf or
to somehow make it conf_warning("unknown symbol: %s\n", line) when it
reads a line from oldconf that it cannot sym_find()?

That would save a ton of time.