On Fri, 2007-10-26 at 06:47 +1000, Benjamin Herrenschmidt wrote: > > Solution: The only solution I found to this dilemma is a new typedef: > > a pgtable_t. For s390 pgtable_t will be a (pte *) - to be introduced > > with a later patch. For everybody else it will be a (struct page *). > > The additional problem with the initialization of the ptl lock and the > > NR_PAGETABLE accounting is solved with a constructor pgtable_page_ctor > > and a destructor pgtable_page_dtor. The page table allocation and free > > functions need to call these two whenever a page table page is allocated > > or freed. pmd_populate will get a pgtable_t instead of a struct page > > pointer. To get the pgtable_t back from a pmd entry that has been > > installed with pmd_populate a new function pmd_pgtable is added. It > > replaces the pmd_page call in free_pte_range and apply_to_pte_range. > > Interesting. That means I don't need to have a PTE page to be a struct > page anymore ? I can have good use for that on powerpc as well... That would be good news. I'm curious, can you elaborate on what the use case is? -- blue skies, Martin. "Reality continues to ruin my life." - Calvin. - To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
