On Thu, Feb 07, 2019 at 12:49:42PM +0100, Sebastian Andrzej Siewior wrote: > On 2019-01-30 12:55:07 [+0100], Borislav Petkov wrote: > > This definitely needs to be written somewhere in > > > > arch/x86/include/asm/fpu/internal.h > > > > or where we decide to put the FPU handling rules. > > Added: > > Index: staging/arch/x86/include/asm/fpu/internal.h > =================================================================== > --- staging.orig/arch/x86/include/asm/fpu/internal.h > +++ staging/arch/x86/include/asm/fpu/internal.h > @@ -537,6 +537,12 @@ static inline void __fpregs_load_activat > * > * The FPU context is only stored/restore for user task and ->mm is used to > * distinguish between kernel and user threads. > + * > + * If TIF_NEED_FPU_LOAD is cleared then CPU's FPU registers are holding the > + * current content of current()'s FPU register state. "current content of current" - that's a lot of c... Make that "... then the CPU's FPU registers are mirrored in the current thread's FPU registers state." > + * If TIF_NEED_FPU_LOAD is set then CPU's FPU registers may not hold current()'s > + * FPU registers. It is required to load the register before returning to ^^^^^^^^ s/register/registers/ - plural. Thx. -- Regards/Gruss, Boris. Good mailing practices for 400: avoid top-posting and trim the reply.