On Thu, 29 Jul 2010, Russell King - ARM Linux wrote: > And no, setting the sparse section size to 512kB doesn't work - memory is > offset by 256MB already, so you need a sparsemem section array of 1024 > entries just to cover that - with the full 256MB populated, that's 512 > unused entries followed by 512 used entries. That too is going to waste > memory like nobodies business. SPARSEMEM EXTREME does not handle that? Some ARMs seem to have MMUs. If so then use SPARSEMEM_VMEMMAP. You can map 4k pages for the mmap through a page table. Redirect unused 4k blocks to the NULL page. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>