Commit 0986d977 authored Feb 09, 2016 by Christian Borntraeger Committed by Martin Schwidefsky Feb 11, 2016

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



commit 204ee2c5 ("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: 204ee2c5 ("s390/irqflags: optimize irq restore")
Signed-off-by: Christian Borntraeger <borntraeger@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

parent 232f5dd7

arch/s390/mm/maccess.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -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;
		}

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