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My UEK-derived config has 1030 files depending on pagemap.h before this change. Afterwards, just 326 files need to be rebuilt when I touch pagemap.h. I think blkdev.h is probably included too widely, but untangling that dependency is harder and this solves my problem. x86 allmodconfig builds, but there may be implicit include problems on other architectures. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Matthew Wilcox (Oracle) <[email protected]> Acked-by: Dan Williams <[email protected]> [nvdimm] Acked-by: Jens Axboe <[email protected]> [block] Reviewed-by: Christoph Hellwig <[email protected]> Acked-by: Coly Li <[email protected]> [bcache] Acked-by: Martin K. Petersen <[email protected]> [scsi] Reviewed-by: William Kucharski <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>