[1/5] powerpc: Test MSR_FP and MSR_VEC when enabling/flushing VSX

[Michael Ellerman]

On Wed, 2017-08-16 at 06:01:14 UTC, Benjamin Herrenschmidt wrote:
> VSX uses a combination of the old vector registers, the old FP registers
> and new "second halves" of the FP registers.
> 
> Thus when we need to see the VSX state in the thread struct
> (flush_vsx_to_thread) or when we'll use the VSX in the kernel
> (enable_kernel_vsx) we need to ensure they are all flushed into
> the thread struct if either of them is individually enabled.
> 
> Unfortunately we only tested if the whole VSX was enabled, not
> if they were individually enabled.
> 
> Signed-off-by: Benjamin Herrenschmidt <benh at kernel.crashing.org>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/5a69aec945d27e78abac9fd032533d

cheers