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

[Linus Torvalds]

On Tue, Feb 23, 2021 at 11:55 AM Linus Torvalds
<torvalds@xxxxxxxxxxxxxxxxxxxx> 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