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(parent: f6c9b16) | patch
s390/maccess: reduce stnsm instructions
authorHeiko Carstens <heiko.carstens@de.ibm.com>
Fri, 12 Feb 2016 11:40:31 +0000 (12:40 +0100)
committerMartin Schwidefsky <schwidefsky@de.ibm.com>
Wed, 17 Feb 2016 08:05:04 +0000 (09:05 +0100)
commit52499d93d6dec3872de3b982219af6d4c182a452
tree4565561ab51516a02a27bf26438b5de2bd2fc5dbtree | snapshot (tar.gz zip)
parentf6c9b160233f9b5afe926b91b55589b706076640commit | diff
s390/maccess: reduce stnsm instructions

When fixing the DAT off bug ("s390: fix DAT off memory access, e.g.
on kdump") both Christian and I missed that we can save an additional
stnsm instruction.

This saves us a couple of cycles which could improve the speed of
memcpy_real.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
arch/s390/mm/maccess.c diff | blob | blame | history