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| author | Christian Borntraeger <borntraeger@de.ibm.com> | 2016-01-11 09:17:18 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2016-01-19 12:14:01 +0100 |
| commit | 204ee2c5643199a25181ec04ea645d00709c2a5a (patch) | |
| tree | 805f6c767221ddf0813be23a9b05829429ec60bc /Documentation/iostats.txt | |
| parent | a9d7ab97812cf2cf9fd7c980205ae35f58c52cf5 (diff) | |
| download | linux-204ee2c5643199a25181ec04ea645d00709c2a5a.tar.bz2 | |
s390/irqflags: optimize irq restore
The ssm instruction takes longer that stnsm/stosm as it is often
used to modify DAT and PER. We know that irqsave/irqrestore only
deals with external and I/O interrupts and we know that irqrestore
can transition only from disabled->disabled or disabled->enabled,
so we can use the faster stosm.
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Diffstat (limited to 'Documentation/iostats.txt')
0 files changed, 0 insertions, 0 deletions