Ingo Molnar wrote:
>>
>> +static inline int kernel_fpu_using(void)
>> +{
>> + if (in_interrupt() && !(read_cr0() & X86_CR0_TS))
>> + return 1;
>> + return 0;
>> +}
>> +
>
> Looks sane to me. Herbert, do you ack it?
>
Although I have to say, the structure of:
if (boolean test)
return 1;
return 0;
... truly was hit with the ugly stick. It really should be:
static inline bool kernel_fpu_using(void)
{
return in_interrupt() && !(read_cr0() && C86_CR0_TS);
}
Huang: if I recall correctly, these functions were originally designed
to deal with the fact that VIA processors generate spurious #TS faults
due to broken design of the Padlock instructions. The AES and PCLMUL
instructions actually use SSE registers and so will require different
structure.
-hpa
--
H. Peter Anvin, Intel Open Source Technology Center
I work for Intel. I don't speak on their behalf.
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