From: Paul Mackerras <paulus@samba.org>
Date: Sat, 6 Oct 2001 18:06:23 +1000 (EST)
The argument for supplying this functionality in the PCI DMA code
would be that if it was done there it could be done once, and in a
sophisticated and efficient (and SMP-safe :) fashion, rather than
ad-hoc in each driver.
The argument against it is that if you provide such an easy way out,
people will just blindly transform bus_to_virt/virt_to_bus without
considering more straightforward methods when they exist.
I can not even count on one hand how many people I've helped
converting, who wanted a bus_to_virt() and when I showed them
how to do it with information the device provided already they
said "oh wow, I never would have thought of that". That process
won't happen as often with the suggested feature.
I am adamently against generic infrastructure to do this. Yes, it's
social engineering, tough cookies... it's social engineering that I
know is working :-)
Franks a lot,
David S. Miller
davem@redhat.com
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This archive was generated by hypermail 2b29 : Sun Oct 07 2001 - 21:00:41 EST