block: split bio_kmalloc from bio_alloc_bioset
bio_kmalloc shares almost no logic with the bio_set based fast path in bio_alloc_bioset. Split it into an entirely separate implementation. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NJohannes Thumshirn <johannes.thumshirn@wdc.com> Reviewed-by: NChaitanya Kulkarni <chaitanya.kulkarni@wdc.com> Acked-by: NDamien Le Moal <damien.lemoal@wdc.com> Signed-off-by: NJens Axboe <axboe@kernel.dk>
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