Re: [PATCH 5/8] x86/head: remove useless zeroed word

H. Peter Anvin
2016-08-22T22:25:43Z

On August 22, 2016 2:48:46 PM PDT, Andi Kleen <andi@firstfloor.org> wrote:
>Josh Poimboeuf <jpoimboe@redhat.com> writes:
>
>> This zeroed word has no apparent purpose, so remove it.
>>
>> Brian Gerst says:
>>
>> "FYI the word used to be the SS segment selector for the LSS
>> instruction, which isn't needed in 64-bit mode."
>>
>
>Seems dangerous. It wouldn't surprise me if some CPUs or x86 emulations
>load it anyways and trigger page faults if there is really nothing
>there.
>
>-Andi

Yes, seems pointlessly risky.
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