On Tue, Sep 24, 2013 at 09:53:47PM +0800, Zhang Yanfei wrote: > OK, this is just because we allocate pagtables just above the kernel. > And if we use up the BRK space that is reserved for inital pagetables, > we will use memblock to allocate memory for pagetables, and the memory > allocated here should be mapped already. So we first map [kernel_end, end) > to make memory above the kernel be mapped as soon as possible. And then > use pagetables allocated above the kernel to map [ISA_END_ADDRESS, kernel_end). I see. The code seems fine to me then. Can you please add comment explaining why the split calls are necessary? Thanks. -- tejun -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>