linux-kernel - Re: Unable bisect issue because kernel not building from old commits

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Date:   Sun, 25 Sep 2022 06:20:31 +0200
From:   Willy Tarreau <w@....eu>
To:     Mikhail Gavrilov <mikhail.v.gavrilov@...il.com>
Cc:     ast@...nel.org, yhs@...com, sean.wang@...iatek.com,
        Linux List Kernel Mailing <linux-kernel@...r.kernel.org>
Subject: Re: Unable bisect issue because kernel not building from old commits

On Sun, Sep 25, 2022 at 03:22:10AM +0500, Mikhail Gavrilov wrote:
> Hi!
> I want to make bisect between commits fdaf9a5840ac and babf0bb978e3,
> because after commit babf0bb978e3 Wi-Fi (mt7921e) upload speed became
> limited to 170Mbps. On commit fdaf9a5840ac upload speed was 784Mbps.
> 
> But I ran into a problem that the gcc-12.2.1 compiler on my
> distribution (Fedora) can't build the kernel from old commits. The
> build fails with the following error:
> ld: warning: arch/x86/power/hibernate_asm_64.o: missing
> .note.GNU-stack section implies executable stack
(...)

Note that this looks more related to binutils here. Regardless, there
are pre-built toolchains including compiler+binutils for various gcc
versions from 4.9 and up here, for all supported architectures:

   https://mirrors.edge.kernel.org/pub/tools/crosstool/

These ones are sufficient to build a kernel and are likely easier to
deal with than trying to port a patch over a bisect session. For example
you could have luck with 7.5 which has been supported for a very long
time and still is supported.

Hoping this helps,
Willy