s390/vtime: Get rid of redundant WARN_ON

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in the cpu time accounting function vtime_account_irq_enter
(vtime_account_system) we use a WARN_ON_ONCE(!irqs_disabled()).
This is redundant as the function virt_timer_forward is always
called and has a BUG_ON(!irqs_disabled()).

This saves several nanoseconds in my specific testcase (KVM entry/exit)
and probably all other callers like (soft)irq entry/exit.

Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

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Christian Borntraeger 2014-12-12 10:44:20 +01:00 • committed by Martin Schwidefsky

parent 099eae11a8

commit 032014bc04

1 changed files with 0 additions and 2 deletions

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arch/s390/kernel/vtime.c

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