Add thp_anon= cmdline parameter to allow specifying the default
enablement of each supported anon THP size. The parameter accepts the
following format and can be provided multiple times to configure each
size:
thp_anon=<size>[KMG]:<value>
See Documentation/admin-guide/mm/transhuge.rst for more details.
Configuring the defaults at boot time is useful to allow early user
space to take advantage of mTHP before its been configured through
sysfs.
Signed-off-by: Ryan Roberts <ryan.roberts@xxxxxxx>