From: Christian Borntraeger <borntraeger@de.ibm.com>
Date: Fri, 12 Dec 2014 09:44:20 +0000 (+0100)
Subject: s390/vtime: Get rid of redundant WARN_ON
X-Git-Tag: fixes-v4.0-rc1~134^2~46
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=032014bc04ae97fd0474f311259db7d669e47507;p=pandora-kernel.git

s390/vtime: Get rid of redundant WARN_ON

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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