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s390: fix DAT off memory access, e.g. on kdump

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commit 204ee2c56431 ("s390/irqflags: optimize irq restore") optimized
irqrestore to really only care about interrupts and adapted the
remaining low level users. One spot (memcpy_real) was not touched,
though - fix it. Otherwise a kdump kernel will fail while reading
the old kernel. As we re-enable irqs with a non-standard function
we have to tell lockdep about that.

Fixes: 204ee2c56431 ("s390/irqflags: optimize irq restore")
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Christian Borntraeger 2016-02-09 16:23:39 +01:00 committed by Martin Schwidefsky
parent 232f5dd785
commit 0986d97741
1 changed files with 3 additions and 1 deletions
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4
arch/s390/mm/maccess.c
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@ -101,7 +101,9 @@ int memcpy_real(void *dest, void *src, size_t count)
local_irq_save(flags);
__arch_local_irq_stnsm(0xfbUL);
rc = __memcpy_real(dest, src, count);
local_irq_restore(flags);
if (!arch_irqs_disabled_flags(flags))
trace_hardirqs_on();
__arch_local_irq_ssm(flags);
return rc;
}