[lkml]   [2001]   [Dec]   [4]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [Linux-ia64] patch to no longer use ia64's software mmu
>>>>> On Tue, 4 Dec 2001 18:19:55 +0000 (GMT), Alan Cox <> said:

Alan> I don't see the need: GFP_DMA is the ISA DMA zone. pci_* API
Alan> is used by everyone else [for 2.5].
>> Without a 4GB zone, you may end up creating bounce buffers
>> needlessly for 32-bit capable DMA devices, no?

Alan> Yes - but it becomes an implementation detail. Drivers don't
Alan> go around asking for kmalloc in 4Gb zone anymore they ask for
Alan> PCI memory that a 32bit pci address can hit. I'm sure a 4Gb
Alan> zone is what will be there internally but you don't need
Alan> GFP_4GBZONE as a visible driver detail.

Oh, OK, we're in agreement then. When I looked at the zone stuff the
last time, I didn't think you could have an internal 4GB zone without
abusing an existing zone making some changes to the header files in
linux/*.h, but perhaps I missed something.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2005-03-22 13:18    [W:0.075 / U:0.664 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site