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().
At least one is that virt_to_phys()'s argument is usually 'volatile' while __pa() is not. This, of course, varies from arch to arch. If somebody wants to go and rip __pa() out from all of the arches, I won't be especially sorry :) Actually, it would be nice to have one arch-generic version which is just the usual (vaddr - PAGE_OFFSET). That would probably take care of 80% of the individual implementations. -- Dave - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html
