Re: [PATCH 3/8] s390/entry: shorten OUTSIDE macro

[Heiko Carstens <hca@linux.ibm.com>]

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@linux.ibm.com>
> ---
>  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.