Re: [PATCH] gurantee DMA area for alloc_bootmem_low() ver. 2.

Dave Hansen
2005-08-10T16:23:51Z

On Tue, 2005-08-09 at 20:06 -0700, Dave Hansen wrote:
> On Tue, 2005-08-09 at 14:15 -0700, Mike Kravetz wrote:
> > On Tue, Aug 09, 2005 at 08:11:20PM +0900, Yasunori Goto wrote:
> > > I modified the patch which guarantees allocation of DMA area
> > > at alloc_bootmem_low().
> >
> > I was going to replace more instances of __pa(MAX_DMA_ADDRESS) with
> > max_dma_physaddr(). However, when grepping for MAX_DMA_ADDRESS I
> > noticed instances of virt_to_phys(MAX_DMA_ADDRESS) as well. Can
> > someone tell me what the differences are between __pa() and virt_to_phys().

One more thing is the obvious: __pa() is always a macro, and
virt_to_phys() is sometimes a function. __pa() can, therefore, be used
in assembly.

-- Dave