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

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Message-ID: <76e70343-e9f6-9054-4fd1-703821fe77df@suse.com>
Date:   Tue, 19 Jan 2021 13:12:04 +0100
From:   Jürgen Groß <jgross@...e.com>
To:     Borislav Petkov <bp@...en8.de>
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 19.01.21 13:06, Borislav Petkov wrote:
> 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...
> 

Oh, well hidden. :-)

I'll use that one.


Juergen

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