linux-kernel - Re: [PATCH] x86: Add a "x86" ELF note namespace

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Message-ID: <20231122140710.GDZV4LDmgF9lXtXdDZ@fat_crate.local>
Date:   Wed, 22 Nov 2023 15:07:10 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Linux regressions mailing list <regressions@...ts.linux.dev>
Cc:     lukas.bulwahn@...il.com, dave.hansen@...ux.intel.com,
        hpa@...or.com, kernel-janitors@...r.kernel.org,
        linux-kernel@...r.kernel.org, mingo@...hat.com, tglx@...utronix.de,
        x86@...nel.org, initramfs@...r.kernel.org
Subject: Re: [PATCH] x86: Add a "x86" ELF note namespace

On Wed, Nov 22, 2023 at 02:24:43PM +0100, Borislav Petkov wrote:
> Displaying notes found in: .notes
>   Owner                Data size        Description
>   ...
>   x86                  0x00000004       Unknown note type: (0x00000000)
>   description data: 01 00 00 00
>   ^^^^^^^^^^^^^^

Note to self: since this is a u32, the next version should define that
only the 1st bit is valid and the rest are reserved. So that they can be
used as a bitfield in case something more needs to be communicated in
the future and we don't waste a whole u32 just for one bit of
information...

-- 
Regards/Gruss,
    Boris.

https://people.kernel.org/tglx/notes-about-netiquette