Re: get_free_pages or kmalloc alignment in PPC

[Geert U. <ge...@li...>]

On Sun, 26 Nov 2000 fh...@at... wrote:
> Is there any info on how to align memory in the Linux PPC
> kernel.  Actually info on how get_free_pages aligns memory.
> I'm guessing that this is the major problem with getting the
> PuP SCSI working.
> 
> It looks like what most of the drivers I looked at do is add
> a little extra to the size of the chunk and then move the
> pointer so it's on a 32 bit boundary.  Seems simple enough.
> What if the chip that wants to do DMA only needs 16 bit
> (or 8 bit) alignment?  It seems that then there is a further  problem
> where the memory needs to be "synced" so the 
> 16bit or 8 bit parts line up with the 32bit parts.

Doesn't get_free_pages() simply return page-aligned data?

Gr{oetje,eeting}s,

						Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- ge...@li...

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
							    -- Linus Torvalds