Re: [RFC PATCH] x86 alternatives : fix LOCK_PREFIX race with preemptiblekernel and CPU hotplug

[Jeremy Fitzhardinge]

Mathieu Desnoyers wrote:
> I'm just worried about this comment from Harvey Harrison :
>
> arch/x86/mm/fault.c : is_prefetch()
>
>                          * Values 0x26,0x2E,0x36,0x3E are valid x86 prefixes.
>                          * In X86_64 long mode, the CPU will signal invalid
>                          * opcode if some of these prefixes are present so
>                          * X86_64 will never get here anyway
>   

I would say that comment is wrong.  But we'd never put a lock prefix on 
a prefetch, so you won't be added a ds prefix either.

   J
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