Matthew Jacob wrote:
I'm afraid I don't understand the 'unreasonable' argument here. Linux
is eating your lunch today. Do you want it to eat your dessert as well?
-matt
bus_size_t is used for things like measuring transfer segment size.
There is little chance that Linux, Windows, FreeBSD, or any other OS
is ever going to try to DMA more than 2^32 bytes of data in a single
bus transaction. Maybe you could contrive a silly infiniband device
to do it. Anyways, it has no bearing on whether the CPU, memory
controller, or PCI buses can do 64 bit addressing.
Oh, sorry, yes, I agree it's *unlikely* that anything will DMA more than
2^32 bytes at a time right now. I'm really really tired and lost lock.
Sorry.
And actually, it's 100% impossible to do a transfer larger than 2^32 on
PCI Express due to the protocol requiring that a transfer not cross a
4GB boundary. So, I think that we are pretty safe with this typedef for
the next 5-10 years. Of course, I'll be honored when Linus calls me a
moron for this 7 years from now =-)
Scott
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