Re: 2.6.5-mc2

[William Lee Irwin III <wli@holomorphy.com>]

On Wed, Apr 07, 2004 at 11:27:38AM -0700, Andrew Morton wrote:
> I did it this way, relying on magical promotions:
> --- 25/fs/open.c~nfs-32bit-statfs-fix-warning-fix	2004-04-06 23:16:25.221685072 -0700
> +++ 25-akpm/fs/open.c	2004-04-06 23:16:25.225684464 -0700
> @@ -64,10 +64,10 @@ static int vfs_statfs_native(struct supe
>  			 * f_files and f_ffree may be -1; it's okay to stuff
>  			 * that into 32 bits
>  			 */
> -			if (st.f_files != 0xffffffffffffffffULL &&
> +			if (st.f_files != -1 &&
>  			    (st.f_files & 0xffffffff00000000ULL))
>  				return -EOVERFLOW;
> -			if (st.f_ffree != 0xffffffffffffffffULL &&
> +			if (st.f_ffree != -1 &&
>  			    (st.f_ffree & 0xffffffff00000000ULL))

Are you sure this works? IIRC -1 is promoted only afterward, yielding
on 64-bit (1UL << 32) - 1 instead of ~0UL, which was the issue with
init_task.cpus_allowed being initialized to -1 on 2.4.x. Maybe it's
better behaved in this instance (language lawyer territory).

-- wli