Source: https://www.kernel.org/doc/Documentation/memory-hotplug.txt
How to online memory
When the memory is hot-added, the kernel decides whether or not to "online"
it according to the policy which can be read from "auto_online_blocks" file::
% cat
This bug is awaiting verification that the linux-gcp-
fips/5.15.0-1055.63+fips2 kernel in -proposed solves the problem. Please
test the kernel and update this bug with the results. If the problem is
solved, change the tag 'verification-needed-jammy-linux-gcp-fips' to
This bug is awaiting verification that the linux-mtk/5.15.0-1030.34
kernel in -proposed solves the problem. Please test the kernel and
update this bug with the results. If the problem is solved, change the
tag 'verification-needed-jammy-linux-mtk' to 'verification-done-jammy-
linux-mtk'. If the
This bug is awaiting verification that the linux-azure-
fips/5.15.0-1058.66+fips1 kernel in -proposed solves the problem. Please
test the kernel and update this bug with the results. If the problem is
solved, change the tag 'verification-needed-jammy-linux-azure-fips' to
