On (02/12/18 11:05), Bart Van Assche wrote:
[..]
> diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
> index ac4740cf74be..cf17626604c2 100644
> --- a/include/linux/blkdev.h
> +++ b/include/linux/blkdev.h
> @@ -1026,14 +1026,25 @@ static inline int blk_rq_cur_bytes(const struct 
> request *rq)
>  
>  extern unsigned int blk_rq_err_bytes(const struct request *rq);
>  
> +/*
> + * Variables of type sector_t represent an offset or size that is a multiple 
> of
> + * 2**9 bytes. Hence these two constants.
> + */
> +#ifndef SECTOR_SHIFT
> +enum { SECTOR_SHIFT = 9 };
> +#endif
> +#ifndef SECTOR_SIZE
> +enum { SECTOR_SIZE = 512 };
> +#endif

Shouldn't SECTOR_SIZE depend on SECTOR_SHIFT?

1 << SECTOR_SHIFT

        -ss

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