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

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Date:   Tue, 23 Feb 2021 21:01:30 +0100
From:   Christoph Hellwig <hch@....de>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Jessica Yu <jeyu@...nel.org>, Christoph Hellwig <hch@....de>,
        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 11:55:50AM -0800, Linus Torvalds wrote:
> On Tue, Feb 23, 2021 at 10:42 AM Linus Torvalds
> <torvalds@...ux-foundation.org> wrote:
> >
> > I think there is something horribly wrong in my tree, and my build
> > process is now about 30% slower. It went from 5+ minutes to 8+
> > minutes. The main suspect would be some lack of parallelism.
> 
> 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.

Does your build now enable TRIM_UNUSED_KSYMS but previously didn't by
chance?

> 
>               Linus
---end quoted text---