On Sat, 31 Jul 2010, Russell King - ARM Linux wrote: > Looking at vmemmap sparsemem, we need to fix it as the page table > allocation in there bypasses the arch defined page table setup. You are required to define your own vmemmap_populate function. In that you can call some of the provided functions or use your own. > This causes a problem if you have 256-entry L2 page tables with no > room for the additional Linux VM PTE support bits (such as young, > dirty, etc), and need to glue two 256-entry L2 hardware page tables > plus a Linux version to store its accounting in each page. See > arch/arm/include/asm/pgalloc.h. > > So this causes a problem with vmemmap: > > pte_t entry; > void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node); > if (!p) > return NULL; > entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL); > > Are you willing for this stuff to be replaced by architectures as > necessary? Sure its designed that way. If we missed anything we'd surely add it. -- 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>