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authorHeiko Carstens <heiko.carstens@de.ibm.com>2013-04-27 12:42:18 +0200
committerMartin Schwidefsky <schwidefsky@de.ibm.com>2013-05-02 15:50:22 +0200
commitd009f4d8860defaea65ea7573818b96f3c4b171e (patch)
treeb4ddaf9bc9ac7a88a5b051a8b5e8e536391e506a /arch/s390
parent066b9fd660befd59dff77e24963338bfeabb8c3b (diff)
downloadop-kernel-dev-d009f4d8860defaea65ea7573818b96f3c4b171e.zip
op-kernel-dev-d009f4d8860defaea65ea7573818b96f3c4b171e.tar.gz
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>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/mm/mem_detect.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/arch/s390/mm/mem_detect.c b/arch/s390/mm/mem_detect.c
index 22d502e..fb216e1 100644
--- a/arch/s390/mm/mem_detect.c
+++ b/arch/s390/mm/mem_detect.c
@@ -47,19 +47,21 @@ static void find_memory_chunks(struct mem_chunk chunk[])
void detect_memory_layout(struct mem_chunk chunk[])
{
- unsigned long flags, cr0;
+ unsigned long flags, flags_dat, cr0;
memset(chunk, 0, MEMORY_CHUNKS * sizeof(struct mem_chunk));
/* Disable IRQs, DAT and low address protection so tprot does the
* right thing and we don't get scheduled away with low address
* protection disabled.
*/
- flags = __arch_local_irq_stnsm(0xf8);
+ local_irq_save(flags);
+ flags_dat = __arch_local_irq_stnsm(0xfb);
__ctl_store(cr0, 0, 0);
__ctl_clear_bit(0, 28);
find_memory_chunks(chunk);
__ctl_load(cr0, 0, 0);
- arch_local_irq_restore(flags);
+ __arch_local_irq_ssm(flags_dat);
+ local_irq_restore(flags);
}
EXPORT_SYMBOL(detect_memory_layout);
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