Lanttor <lanttor.guo@xxxxxxxxxxxxx> writes:
In my understanding, the kernel page mapping depends on PAGE_OFFSET. For example, if PAGE_OFFSET is 0x00000000 (assuming 256M memory), the kernel virtual address will be at (0x00000000 - 0x10000000), right?
On m68k, the kernel virtual addresses are in a separate address space from user space, thus the value of PAGE_OFFSET is somewhat arbitrary.
Could this incur some side effect? I see the definition of PAGE_OFFSET is 0xc0000000 on much platforms.
On those platforms kernel and user space share the same address space, and PAGE_OFFSET makes sure that they don't overlap. Andreas. -- Andreas Schwab, schwab@xxxxxxxxxxxxxx GPG Key fingerprint = 58CA 54C7 6D53 942B 1756 01D3 44D5 214B 8276 4ED5 "And now for something completely different." -- To unsubscribe from this list: send the line "unsubscribe linux-m68k" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
