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>> +
>>     
>
> Is there anything in implementation of this option Loongson2-specific?
>   
Yes. Most 64bit MIPS processors cannot access 64bit content of registers 
when it is in 32bit mode.

Loongson2 has no 32/64 mode bit in fact.

And the usage arise from Loongson2's multimedia extension, which is also 
uniq.
> If not then I suggest we make this option loook like:
>
>    bool "Save 64bit integer registers" if CPU_SUPPORTS_64BIT_KERNEL && 32BIT
>
> Somebody else might have a use for it!
>
>   Ralf
>
>
>
>
>