Hi, Is there any reason to use __pa() rather than virt_to_phys() or vice versa? On i386 virt_to_phys() is just a function that returns the value returned by __pa(); on Alpha virt_to_phys() is a function that subtracts IDENT_ADDR from the argument, whereas __pa() is a macro that subtracts PAGE_OFFSET from its argument - however PAGE_OFFSET and IDENT_ADDR expand to the same value; on Sparc virt_to_phys() is a macro that expands to __pa(). So the two things look to be pretty much the same on different platforms - is there any reason for having __pa() as well as virt_to_phys(), and which one is to be used by device drivers? thanks for your help regards Martin -- Supercomputing System AG email: maletinsky@scs.ch Martin Maletinsky phone: +41 (0)1 445 16 05 Technoparkstrasse 1 fax: +41 (0)1 445 16 10 CH-8005 Zurich -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ IRC Channel: irc.openprojects.net / #kernelnewbies Web Page: http://www.kernelnewbies.org/
