Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.

>> >> +1:	movw GS(%esp), %gs
>> >
>> > movl is recommended in 32bit mode
>> 
>> arch/i386/kernel/entry.S: Assembler messages:
>> arch/i386/kernel/entry.S:334: Error: suffix or operands invalid for `mov'
>
>Looks like a gas bug to me.

So the suffixing (MOVW vs MOVL) does not depend on the source operand?
%gs is only 16 bit wide so MOVW seems reasonable. If the destination 
operand was a 32 bit location, something like MOVZX would be needed, would 
not it?

Jan Engelhardt
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• References:
  • [PATCH RFC 0/6] Implement per-processor data areas for i386.
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.
    • From: Andi Kleen <[email protected]>
  • Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.
    • From: Jeremy Fitzhardinge <[email protected]>
  • Re: [PATCH RFC 3/6] Use %gs as the PDA base-segment in the kernel.
    • From: Andi Kleen <[email protected]>

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