Re: [PATCH 14/33] readahead: state based method - data structure

Wu Fengguang <[email protected]> wrote:
>
>  #define RA_FLAG_MISS 0x01	/* a cache miss occured against this file */
>   #define RA_FLAG_INCACHE 0x02	/* file is already in cache */
>  +#define RA_FLAG_MMAP		(1UL<<31)	/* mmaped page access */
>  +#define RA_FLAG_NO_LOOKAHEAD	(1UL<<30)	/* disable look-ahead */
>  +#define RA_FLAG_EOF		(1UL<<29)	/* readahead hits EOF */

Odd.  Why not use 4, 8, 16?
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