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SubjectRe: [PATCH] x86: Extend test_and_set_bit() test_and_clean_bit() to 64 bits in X86_64
Andi Kleen wrote:
>>>
>> The right way to do it is to pass the proper type of register.
>
> For the input index register you don't actually need 64bit and for the
> value it's typically memory anyways.
>

If you have a 64-bit operation you have a 64-bit index register. And
you need a 64-bit index for it to handle over 2^31 (since it is signed.)

-hpa

--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.



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