[PATCH v2 11/14] powerpc/64s: Clear/restore caller gprs in syscall interrupt/return

[Segher Boessenkool]

On Thu, Aug 11, 2022 at 03:39:58PM +0000, Christophe Leroy wrote:
> 
> 
> Le 11/08/2022 à 17:13, Segher Boessenkool a écrit :
> > Hi!
> > 
> > On Mon, Jul 25, 2022 at 04:31:11PM +1000, Rohan McLure wrote:
> >> +	/*
> >> +	 * Zero user registers to prevent influencing speculative execution
> >> +	 * state of kernel code.
> >> +	 */
> >> +	NULLIFY_GPRS(5, 12)
> >> +	NULLIFY_NVGPRS()
> > 
> > "Nullify" means "invalidate", which is not what this does or is for :-(
> 
> Would "Zeroise" be more appropriate ?

That is probably a good compromise, yes.  It obviously is a verb, its
meaning is clear and unamiguous, and there is precedent for it even :-)

Thanks,


Segher