linux-kernel - Re: [PATCH v3 07/15] x86/alternative: support "not feature" and ALTERNATIVE

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20210119120647.GJ27433@zn.tnic>
Date:   Tue, 19 Jan 2021 13:06:47 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     Jürgen Groß <jgross@...e.com>
Cc:     xen-devel@...ts.xenproject.org, x86@...nel.org,
        linux-kernel@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>
Subject: Re: [PATCH v3 07/15] x86/alternative: support "not feature" and
 ALTERNATIVE_TERNARY

On Tue, Jan 19, 2021 at 12:35:42PM +0100, Jürgen Groß wrote:
> In fact this should rather be named "X86_FEATURE_TRUE", as this is its
> semantics.
>
> And I think I can define it to the value 0xffff instead of using a
> "real" bit for it.

A real bit is cheap - a special value to pay attention to in the future
not so much. Also we do have X86_FEATURE_ALWAYS already which has a
similar purpose...

-- 
Regards/Gruss,
    Boris.

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