Re: [PATCH 2/2] MIPS: Force CPUs to lose FP context during mode switches

[Maciej W. Rozycki]

On Thu, 21 Apr 2016, Paul Burton wrote:

> Fix this by broadcasting an IPI if other CPUs may have live FP context
> for an affected thread, with a handler causing those CPUs to relinquish
> their FPU ownership. Threads will then be allowed to continue running
> but will stall on the wait_on_atomic_t in enable_restore_fp_context if
> they attempt to use FP again whilst the mode switch is still in
> progress. The end result is less fragile poking at scheduler context
> switch counts & a more expedient completion of the mode switch.

Reviewed-by: Maciej W. Rozycki <macro@xxxxxxxxxx>

 Thanks, Paul, for your work on this problem!  I'll rebase my outstanding 
NaN interlinking stuff (https://patchwork.linux-mips.org/patch/11491/) on 
top of your patches -- they address the concern expressed there.

  Maciej