# Re: \[PATCH 3/6\] powerpc: add memory map support to Freescale RapidIO block

- From: Andrew Morton \<akpm@linux-foundation.org\>
- Date: 2009-05-12 22:11:22 
- List: netdev
- Page: https://ratatoskr.run/netdev/2009/05/1249691
- Thread: https://ratatoskr.run/netdev/2009/05/1249321/t.md

```text
On Tue, 12 May 2009 16:36:00 +0800
Li Yang [ref] wrote:

> +	align = (size < 0x1000) ? 0x1000 : 1 << (__ilog2(size - 1) + 1);
> +
> +	/* Align the size */
> +	if ((lstart + size) > (_ALIGN_DOWN(lstart, align) + align)) {

__ilog2() and _ALIGN_DOWN() are powerpc-specific functions.  It would
be preferable to use more general helpers if possible.  ALIGN() and ilog2()
might suit here.
```