Hi, I'm looking though s390 code around page table handling and I found that in many places s390 does tlb flush before changing page table entry. Let's look for instance on pmdp_clear_flush() implementation on s390. It's implemented with pmdp_get_and_clear() which does pmdp_flush_direct() *before* pmd_clear(). That's invert order comparing to generic pmdp_flush_direct(). The question is what prevents tlb from being re-fill between flushing tlb and clearing page table entry? -- 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>