[PATCH V5 01/17] powerpc/mm/slice: Convert slice_mask high slice to a bitmap

[Paul Mackerras]

On Wed, Mar 22, 2017 at 09:06:47AM +0530, Aneesh Kumar K.V wrote:
> In followup patch we want to increase the va range which will result
> in us requiring high_slices to have more than 64 bits. To enable this
> convert high_slices to bitmap. We keep the number bits same in this patch
> and later change that to higher value

See comment below...

> @@ -531,8 +569,8 @@ unsigned long slice_get_unmapped_area(unsigned long addr, unsigned long len,
>  	slice_print_mask(" mask", mask);
>  
>   convert:
> -	andnot_mask(mask, good_mask);
> -	andnot_mask(mask, compat_mask);
> +	slice_andnot_mask(&mask, &good_mask);
> +	slice_andnot_mask(&mask, &compat_mask);
>  	if (mask.low_slices || mask.high_slices) {

The test on mask.high_slices here wants to test whether high_slices
has any bits set, but with the conversion to a bitmap, the test will
be always true since what will be tested is the address of the array
in the bitmap.

Paul.