On Tue, Dec 03, 2019 at 09:49:49AM +0000, Jisheng Zhang wrote: > > As in exactly one boundary and not an alignment? Where the one > > boundary is not a power of two and thus can't be expressed? > > Take drivers/mmc/host/sdhci-of-dwcmshc.c for example, target physical DMA addr > can't span 128MB, 256MB, 128*3MB, ...128*nMB > > I'm not sure whether blk_queue_segment_boundary could solve this limitation. That is exaxtly the kind of limitation blk_queue_segment_boundary is intended for.
