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s390/amode31: Use exrl instead of ex

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exrl is present in all machines currently supported, therefore prefer
it over ex. This saves one instruction and doesn't need an additional
register to hold the address of the target instruction.

Signed-off-by: Sven Schnelle <svens@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
This commit is contained in:
Sven Schnelle 2025-01-08 15:27:03 +01:00 committed by Alexander Gordeev
parent a88c26bb8e
commit 90c5515dcb
1 changed files with 1 additions and 2 deletions
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3
arch/s390/kernel/text_amode31.S
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@ -18,8 +18,7 @@
* affects a few functions that are not performance-relevant.
*/
.macro BR_EX_AMODE31_r14
larl %r1,0f
ex 0,0(%r1)
exrl 0,0f
j .
0: br %r14
.endm