Re: ABI change for device drivers using future AVX instruction set

[Avi Kivity]

Andi Kleen wrote:
> Avi Kivity wrote:
>
>   
> > This is fixable. 
> >     
>
> Sure nearly everything is fixable, but why would you want to do that?
>
> For me the best fix currently seems to be to just not do that
> when it hurts.
>
>   

We already use sse in the kernel (raid), presumably disabling preemption 
there hurts some workloads.

With sse/avx gaining more features, we may see more requirements for 
kernel fpu.

> > We could change kernel_fpu_begin() not to disable
> > preemption, but instead set a task flag.  When we get the "no device"
> > fault, if the flag is set, save the fpu state into the kernel fpu save
> > area 
> >     
>
> What kernel fpu save area do you mean?
>   

A new one, of course.

--
error compiling committee.c: too many arguments to function

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