Hi, I have a question about the virt_to_page function 2.6.5. My development Linux system has 512 MB memory. Through kernel command line (mem=448M), the kernel is using only 448 MB (setting aside 64 MB). I have a driver that uses the upper 64 MB. I get a virtual address of the 64M region as follows: cpuAddr = ioremap(0x1c000000, 64MB); Question: Am I getting a continuous 64MB virtual address space. Having a virtual addres within the 64 MB meomry (lets call it newAddr), I can find it's page/offset as follows: page = virt_to_page(newAddr); - (1) page_ofset = newAddr & (~PAGE_MASK); - (1) I perfrom the above calucation on random virtual address's withing the 64 MB range. Once in a while, I get page == 0. Can someone help me understand why? Thank you, Aha. __________________________________ Do you Yahoo!? The all-new My Yahoo! - What will yours do? http://my.yahoo.com -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
