0e253391a970 ("block: add a missing BIOVEC_SEG_BOUNDARY check in bio_add_pc_page")
6a9f5f240adf ("block: simplify BIOVEC_PHYS_MERGEABLE")
27ca1d4ed04e ("block: move req_gap_back_merge to blk.h")
e9907009cbfc ("block: move req_gap_{back,front}_merge to blk-merge.c")