[PATCH] powerpc/prom: move the device tree if not in declared memory.

If the device tree doesn't reside in the memory which is declared
inside it, it has to be moved as well as this memory will not be
mapped by the kernel.

Signed-off-by: Christophe Leroy <redacted>
---
 arch/powerpc/kernel/prom.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/powerpc/kernel/prom.c b/arch/powerpc/kernel/prom.c
index 87a68e2dc531..4181ec715f88 100644
--- a/arch/powerpc/kernel/prom.c
+++ b/arch/powerpc/kernel/prom.c

@@ -124,8 +124,8 @@ static void __init move_device_tree(void)
 	size = fdt_totalsize(initial_boot_params);
 
 	if ((memory_limit && (start + size) > PHYSICAL_START + memory_limit) ||
-			overlaps_crashkernel(start, size) ||
-			overlaps_initrd(start, size)) {
+	    !memblock_is_memory(start + size - 1) ||
+	    overlaps_crashkernel(start, size) || overlaps_initrd(start, size)) {
 		p = __va(memblock_phys_alloc(size, PAGE_SIZE));
 		memcpy(p, initial_boot_params, size);
 		initial_boot_params = p;

-- 
2.13.3

Christophe Leroy [off-list ref] writes:

If the device tree doesn't reside in the memory which is declared
inside it, it has to be moved as well as this memory will not be
mapped by the kernel.

I worry this will break some obscure platform, but I'll merge it anyway
and we'll see :)

cheers

On Mon, 2018-12-17 at 14:18:27 UTC, Christophe Leroy wrote:

If the device tree doesn't reside in the memory which is declared
inside it, it has to be moved as well as this memory will not be
mapped by the kernel.

Signed-off-by: Christophe Leroy <redacted>

Applied to powerpc next, thanks.

https://git.kernel.org/powerpc/c/f242e0ac95cadb27527d0b06c95772

cheers