On Fri, Nov 03, 2017 at 09:05:51AM +0000, Heiko Carstens wrote: > With "mm: account pud page tables" and "mm: consolidate page table > accounting" pud page table accounting was introduced which now results > in tons of warnings like this one on s390: > > BUG: non-zero pgtables_bytes on freeing mm: -16384 > > Reason for this are our run-time folded page tables: by default new > processes start with three page table levels where the allocated pgd > is the same as the first pud. In this case there won't ever be a pud > allocated and therefore mm_inc_nr_puds() will also never be called. > > However when freeing the address space free_pud_range() will call > exactly once mm_dec_nr_puds() which leads to misaccounting. > > Therefore call mm_inc_nr_puds() within init_new_context() to fix > this. This is the same like we have it already for processes that run > with two page table levels (aka compat processes). > > While at it also adjust the comment, since there is no "mm->nr_pmds" > anymore. Thanks for tracking it down. Acked-by: Kirill A. Shutemov <kirill.shutemov@xxxxxxxxxxxxxxx> -- Kirill A. Shutemov -- 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>
