linux-kernel - Re: [tip: x86/urgent] x86/config: Make the x86 defconfigs a bit more usable

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Date:   Mon, 28 Mar 2022 10:01:27 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org, linux-tip-commits@...r.kernel.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org
Subject: Re: [tip: x86/urgent] x86/config: Make the x86 defconfigs a bit more
 usable

On Sun, Mar 27, 2022 at 09:08:03PM +0200, Ingo Molnar wrote:
> 
> * Peter Zijlstra <peterz@...radead.org> wrote:
> 
> > On Thu, Mar 24, 2022 at 08:50:16AM -0000, tip-bot2 for Ingo Molnar wrote:
> > > The following commit has been merged into the x86/urgent branch of tip:
> > > 
> > > Commit-ID:     aee8bf2d5aab5e7cc24fa90238930fd14d72e580
> > > Gitweb:        https://git.kernel.org/tip/aee8bf2d5aab5e7cc24fa90238930fd14d72e580
> > > Author:        Ingo Molnar <mingo@...nel.org>
> > > AuthorDate:    Thu, 24 Mar 2022 09:31:13 +01:00
> > > Committer:     Ingo Molnar <mingo@...nel.org>
> > > CommitterDate: Thu, 24 Mar 2022 09:32:20 +01:00
> > > 
> > > x86/config: Make the x86 defconfigs a bit more usable
> > > 
> > >  - Use 'make savedefconfig' to refresh & regenerate the files
> > >  - Add in KVM boot enablers
> > 
> > We shouldn't duplicate kvm_guest.config.
> 
> I think x86-defconfig should be usable by itself - not just via the 
> somewhat obscure combination of:
> 
>   make defconfig
>   make kvm_guest.config
> 
> right?

Dunno, i've been using it forever (+- the kvmconfig rename thing, which
was really annoying).

But these days I have it scripted anyway, I also typically add
DEBUG_INFO to any .config that I end up booting.

> > >  - Enable the cgroup features most distros rely on
> > 
> > I've not yet had defconfig+kvm_guest.config fail to boot on debian
> > images (I occasionally grab one here:
> > https://cloud.debian.org/images/cloud/sid/daily/latest/ )
> 
> Systemd is rather negative about missing cgroup features - at a point it 
> used to insert 30(?) seconds delays during bootup warning about missing 
> cgroups support, etc.
> 
> Also the main Debian derived distros (Ubuntu, etc.) plus Debian itself has 
> most of cgroups enabled - so why should we test something that very few 
> users are using?

Yeah, don't mind. I just hadn't had problems booting anything.