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-rw-r--r--mm/gup.c29
1 files changed, 11 insertions, 18 deletions
diff --git a/mm/gup.c b/mm/gup.c
index 5856f68467b3..de1b75ef44da 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -265,20 +265,15 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
bool make_dirty)
{
unsigned long index;
-
- /*
- * TODO: this can be optimized for huge pages: if a series of pages is
- * physically contiguous and part of the same compound page, then a
- * single operation to the head page should suffice.
- */
+ struct page *head;
+ unsigned int ntails;
if (!make_dirty) {
unpin_user_pages(pages, npages);
return;
}
- for (index = 0; index < npages; index++) {
- struct page *page = compound_head(pages[index]);
+ for_each_compound_head(index, pages, npages, head, ntails) {
/*
* Checking PageDirty at this point may race with
* clear_page_dirty_for_io(), but that's OK. Two key
@@ -299,9 +294,9 @@ void unpin_user_pages_dirty_lock(struct page **pages, unsigned long npages,
* written back, so it gets written back again in the
* next writeback cycle. This is harmless.
*/
- if (!PageDirty(page))
- set_page_dirty_lock(page);
- unpin_user_page(page);
+ if (!PageDirty(head))
+ set_page_dirty_lock(head);
+ put_compound_head(head, ntails, FOLL_PIN);
}
}
EXPORT_SYMBOL(unpin_user_pages_dirty_lock);
@@ -318,6 +313,8 @@ EXPORT_SYMBOL(unpin_user_pages_dirty_lock);
void unpin_user_pages(struct page **pages, unsigned long npages)
{
unsigned long index;
+ struct page *head;
+ unsigned int ntails;
/*
* If this WARN_ON() fires, then the system *might* be leaking pages (by
@@ -326,13 +323,9 @@ void unpin_user_pages(struct page **pages, unsigned long npages)
*/
if (WARN_ON(IS_ERR_VALUE(npages)))
return;
- /*
- * TODO: this can be optimized for huge pages: if a series of pages is
- * physically contiguous and part of the same compound page, then a
- * single operation to the head page should suffice.
- */
- for (index = 0; index < npages; index++)
- unpin_user_page(pages[index]);
+
+ for_each_compound_head(index, pages, npages, head, ntails)
+ put_compound_head(head, ntails, FOLL_PIN);
}
EXPORT_SYMBOL(unpin_user_pages);