brd: re-enable __GFP_HIGHMEM in brd_insert_page()
__GFP_HIGHMEM is disabled if dax is enabled on brd, however dax support for brd has been removed since commit (7a862fbb "brd: remove dax support"), so restore __GFP_HIGHMEM in brd_insert_page(). Also remove the no longer applicable comments about DAX and highmem. Cc: stable@vger.kernel.org Fixes: 7a862fbb ("brd: remove dax support") Signed-off-by: NHou Tao <houtao1@huawei.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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