Re: [PATCH] x86/fpu: Disable BH while while loading FPU registers in __fpu__restore_sig()

[Dave Hansen]

On 11/12/18 7:56 AM, Sebastian Andrzej Siewior wrote:
> Use local_bh_disable() around the restore sequence to avoid the race. BH
> needs to be disabled because BH is allowed to run (even with preemption
> disabled) and might invoke kernel_fpu_begin().

FWIW, that would make nice comment fodder for the local_bh_disable().
I'd much rather run into it there than in a changelog.