From: Heiko Carstens <heiko.carstens@de.ibm.com>
Date: Sat, 27 Apr 2013 10:42:18 +0000 (+0200)
Subject: s390/mem_detect: fix lockdep irq tracing
X-Git-Tag: omap-for-v3.10/dt-fixes-for-merge-window~30^2~11
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=d009f4d8860defaea65ea7573818b96f3c4b171e;p=pandora-kernel.git

s390/mem_detect: fix lockdep irq tracing

When disabling and enabling interrupts we must tell lockdep.
So use local_irq_save()/restore() to disable and enable interrupts.
The DAT disabling/enabling get handled separately now.
Note: we may not call trace_hardirqs_on() with DAT disabled, since
the generic code may access vmalloc'ed data structures.

Reported-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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