> I always wondered why the xchg is necessary here at all. If the process of > tearing down a page table entry has started, other users of the mapped > linear address are broken anyway - why is it necessary to still monitor the > effect they may have on the A/D bits, unless this is a transient tear down? > > Checking for the uses of ptep_get_and_clear, I would judge that the use in > change_pte_range() may in fact need the xchg, but the uses in > vunmap_pte_range() and zap_pte_range() shouldn't.
Yes I agree. Might be a nice speed up for exit to distingush the cases. -Andi - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
