mm: remove get_swap_bio
Just reuse the block_device and sector from the swap_info structure, just as used by the SWP_SYNCHRONOUS path. Also remove the checks for NULL returns from bio_alloc as that can't happen for sleeping allocations. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by: Damien Le Moal <damien.lemoal@wdc.com> Signed-off-by: Jens Axboe <axboe@kernel.dk>
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