Daniel Phillips [off-list ref] wrote:

Here is a rearranged zap_pte_range that avoids any operations for out-of-range
pfns.

Please remind us why Linux needs this patch?

+static void invalidate_mmap_range_list(struct list_head *head,
+		 unsigned long const hba,  unsigned long const hlen, int all)
 {

I forget what `all' does?  anon+swapcache as well as pagecache?

A bit of API documentation here would be appropriate.
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