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For example, suppose we have a shift-6 node having an order-9 > entry => 8 - 1 = 7 siblings, so assume the slots are at offset 0 till 7 in > this node. If xas->xa_offset is 6, then the code will compute order as > 1 + xas->xa_node->shift = 7. Therefore, the order computation must start > from the beginning of the multi-slot entries, that is, the non-sibling > entry. Thus ensure that the caller is aware of this by triggering a BUG > when the entry is a sibling entry. Note that this BUG_ON() is only > active while running selftests, so there is no overhead in a running > kernel. > > Signed-off-by: Dev Jain > --- Gentle ping, is anything else required from my side.