Re: [PATCH 1/2] MIPS: MSA: bugfix - disable MSA during thread switch correctly

[Leonid Yegoshin]

Ralf,

If there was TIF_USEDMSA in "prev" task then it means that all MSA HW is 
in use.
And switch_to() checks this and transfers it to resume() to indicate 
that MSA processing should be done.

Macro call "msa_save_all    a0" right before disabling MSA in Config5 
does a save of MSA registers. If it doesn't cause an exception then it 
means that Config5 does exist and Config5.MIPS_CONF5_MSAEN does exist too.

- Leonid.

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