linux-kernel - Re: glibc VETO for kernel version SUBLEVEL >= 255

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Date:   Sun, 26 Sep 2021 16:18:58 +0000
From:   Jari Ruusu <jariruusu@...tonmail.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Salvatore Bonaccorso <carnil@...ian.org>,
        Sasha Levin <sashal@...nel.org>, linux-kernel@...r.kernel.org,
        stable@...r.kernel.org, Jiri Slaby <jirislaby@...nel.org>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Aurelien Jarno <aurelien@...el32.net>
Subject: Re: glibc VETO for kernel version SUBLEVEL >= 255

On Sunday, September 26th, 2021 at 14:39, Greg Kroah-Hartman <gregkh@...uxfoundation.org> wrote:
> On Sun, Sep 26, 2021 at 11:31:20AM +0000, Jari Ruusu wrote:
> > Due to circumstances, I need "smallest possible" kernel with all extra
> > stripped out. 4.9.y kernels are smaller than newer ones.
>
> Smaller by how much, and what portion grew? Are we building things into
> the kernel that previously was able to be compiled out? Or is there
> something new added after 4.9 that adds a huge memory increase?

Byte sizes of different kernels for my laptop. Everything needed built-in,
except for wifi modules. Same compiler, roughly same kernel configs:

6906816 vmlinuz-4.9.284
7603200 vmlinuz-4.19.208
8306752 vmlinuz-5.10.69

> Figuring that out would be good as you only have 1 more year for 4.9.y
> to be alive, that's not going to last for forever...

I will deal with that when 4.9.y updates run dry, or when Raspbian
userland starts requiring newer kernel.

--
Jari Ruusu  4096R/8132F189 12D6 4C3A DCDA 0AA4 27BD  ACDF F073 3C80 8132 F189