Re: [PATCH] bitmap: Support for pages > BITS_PER_LONG.

[Paul Jackson]

James wrote:
> Is wrong.  You're looking for an unset span of order bits at a given
> offset. 

But your comment, James, said:

 * This is used to allocate a memory region from a bitmap.  The idea is
 * that the region has to be 1<<order sized and 1<<order aligned (this
 * makes the search algorithm much faster).



So, like the other Paul said:
> Unless I'm missing something, I don't see how your case
> would happen.

James further wrote:
>   i.e. (assuming BITS_PER_LONG=32) for a span
> of 126 at offset 1, you check

I thought that the span had to be a power of two.  Perhaps
you mean 128, not 126 (order 7: 2**7 == 128).

And I thought, from your comment above, that if the span was
128, then the alignment had to be 128 as well.

-- 
                  I won't rest till it's the best ...
                  Programmer, Linux Scalability
                  Paul Jackson <pj@xxxxxxx> 1.925.600.0401
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/