On Thu, May 12, 2022 at 11:00:31AM -0700, Nick Desaulniers wrote: > 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. If it is only for the machine generations the following links might help: https://www.ibm.com/support/pages/ibm-mainframe-life-cycle-history (see linked pdf for list of machine names) https://en.wikipedia.org/wiki/IBM_Z There might be better sources, but that's all I could find right now.
