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Commit966a967116randomly added alignment to this structure, but it's actually detrimental to performance of null_blk. Test case: Running on both the home and remote node shows a ~5% degradation in performance. While in there, move blk_status_t to the hole after the integer tag in the nullb_cmd structure. After this patch, we shrink the size from 192 to 152 bytes. Fixes:966a967116("smp: Avoid using two cache lines for struct call_single_data") Signed-off-by: Jens Axboe <axboe@kernel.dk>