On Thu, 23 Jun 2016, Arnd Bergmann wrote:

Several drivers use an expensive do_div() to compute the number
of logical or physical blocks in a blockdev, which can be done
more efficiently using a shift, since the blocksize is always
a power of two number.

Let's introduce bdev_logical_block_count() and bdev_physical_block_count()
helper functions mirroring the bdev_logical_block_size() and
bdev_physical_block_size() interfaces for the block size.

Curious, why not just return u64 instead for all these instead of sector_t (ie
dealing with lba, it reads weird)?

Thanks,
Davidlohr