linux-kernel - Re: [GIT PULL] Modules updates for v5.12

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Message-ID: <CAHk-=wjV=OB7_PUWc4XE2vQ64NRWHeXAwhZVrtBqE8-tYrkaFw@mail.gmail.com>
Date:   Tue, 23 Feb 2021 12:01:58 -0800
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Jessica Yu <jeyu@...nel.org>, Christoph Hellwig <hch@....de>
Cc:     Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Miroslav Benes <mbenes@...e.cz>,
        Emil Velikov <emil.l.velikov@...il.com>
Subject: Re: [GIT PULL] Modules updates for v5.12

On Tue, Feb 23, 2021 at 11:55 AM Linus Torvalds
<torvalds@...ux-foundation.org> wrote:
>
> I don't see quite what is wrong, but bisection is clear, and points
> the finger at
>
>     367948220fce "module: remove EXPORT_UNUSED_SYMBOL*"
>
> which looks entirely trivial, but clearly isn't.
>
> It's repeatable. That commit slows down my build hugely.

Hmm. I'm starting to suspect that the problem is that the removal of
CONFIG_UNUSED_SYMBOLS now means that we always trigger
CONFIG_TRIM_UNUSED_KSYMS instead.

And then that CONFIG_TRIM_UNUSED_KSYMS is some hugely expensive operation.

                  Linus