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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 /arch/s390/mm/init.c | |
| parent | s390/mm: use TASK_MAX_SIZE where applicable (diff) | |
| download | linux-dev-204ee2c5643199a25181ec04ea645d00709c2a5a.tar.xz linux-dev-204ee2c5643199a25181ec04ea645d00709c2a5a.zip | |
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 'arch/s390/mm/init.c')
| -rw-r--r-- | arch/s390/mm/init.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/s390/mm/init.c b/arch/s390/mm/init.c index c722400c7697..73e290337092 100644 --- a/arch/s390/mm/init.c +++ b/arch/s390/mm/init.c @@ -98,7 +98,7 @@ void __init paging_init(void) __ctl_load(S390_lowcore.kernel_asce, 1, 1); __ctl_load(S390_lowcore.kernel_asce, 7, 7); __ctl_load(S390_lowcore.kernel_asce, 13, 13); - arch_local_irq_restore(4UL << (BITS_PER_LONG - 8)); + __arch_local_irq_stosm(0x04); sparse_memory_present_with_active_regions(MAX_NUMNODES); sparse_init(); |