On Thu, May 12, 2022 at 10:22 AM Heiko Carstens <hca@xxxxxxxxxxxxx> wrote: > > On Wed, May 11, 2022 at 02:05:27PM +0200, Heiko Carstens wrote: > > Since the minimum architecture level has been raised to z10 a shorter > > instruction sequence can be used to implement the OUTSIDE macro. This > > also reduces the number of used registers within that macro to one. > > > > Signed-off-by: Heiko Carstens <hca@xxxxxxxxxxxxx> > > --- > > arch/s390/kernel/entry.S | 8 +++----- > > 1 file changed, 3 insertions(+), 5 deletions(-) > > > > diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S > > index a6b45eaa3450..e1664b45090f 100644 > > --- a/arch/s390/kernel/entry.S > > +++ b/arch/s390/kernel/entry.S > > @@ -169,11 +169,9 @@ _LPP_OFFSET = __LC_LPP > > * @outside_label: jump here if @reg is outside of [@start..@end) > > */ > > .macro OUTSIDE reg,start,end,outside_label > > - lgr %r14,\reg > > - larl %r13,\start > > - slgr %r14,%r13 > > - lghi %r13,\end - \start > > - clgr %r14,%r13 > > + larl %r14,\start > > + slgrk %r14,\reg,%r14 > > + clgfi %r14,\end - \start > > Clever me.. slgrk was added with z196, and not z10. > So dropping this patch. How do the version numbers work for SystemZ? Is there a list/reference you could link me to? If it's too deep a rabbit hole, then nevermind, but I would like to learn a little more about the architecture. -- Thanks, ~Nick Desaulniers
