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block: null_blk: fix 'Invalid parameters' when loading module
On ARM64, the default page size has been 64K on some distributions, and
we should allow ARM64 people to play null_blk.
This patch fixes the issue by extend page bitmap size for supporting
other non-4KB PAGE_SIZE.
Cc: Bart Van Assche <Bart.VanAssche@wdc.com>
Cc: Shaohua Li <shli@kernel.org>
Cc: Kyungchan Koh <kkc6196@fb.com>,
Cc: weiping zhang <zhangweiping@didichuxing.com>
Cc: Yi Zhang <yi.zhang@redhat.com>
Reported-by: Yi Zhang <yi.zhang@redhat.com>
Signed-off-by: Ming Lei <ming.lei@redhat.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>