ARC: make a copy of flat DT

The flat DT (currently embedded in vmlinux) is in .init section.
The unflattened/binary tree doesn't copy strings through and references
them from orig flat DT - which could cause catestrohpy if of_* APIs are
called post init, say from a driver which is a loadable module.

Reported-by: James Hogan <james.hogan@imgtec.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/arch/arc/include/asm/mach_desc.h b/arch/arc/include/asm/mach_desc.h
index eaebaf835f85..9998dc846ebb 100644
--- a/arch/arc/include/asm/mach_desc.h
+++ b/arch/arc/include/asm/mach_desc.h
@@ -82,4 +82,6 @@ __attribute__((__section__(".arch.info.init"))) = {	\
 };
 
 extern struct machine_desc *setup_machine_fdt(void *dt);
+extern void __init copy_devtree(void);
+
 #endif