s390/irqflags: optimize irq restore

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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>

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Christian Borntraeger 2016-01-11 09:17:18 +01:00 • committed by Martin Schwidefsky

parent a9d7ab9781

commit 204ee2c564

2 changed files with 8 additions and 3 deletions

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9

arch/s390/include/asm/irqflags.h

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2

arch/s390/mm/init.c

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