On 10/27/20 3:55 AM, Matthew Wilcox (Oracle) wrote:
Provide some guidance towards when this might not be the right interface
to use.
Signed-off-by: Matthew Wilcox (Oracle) <willy@xxxxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx>
---
mm/page_alloc.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 23f5066bd4a5..e613177b8041 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5007,6 +5007,26 @@ static inline void free_the_page(struct page *page, unsigned int order)
__free_pages_ok(page, order, FPI_NONE);
}
+/**
+ * __free_pages - Free pages allocated with alloc_pages().
+ * @page: The page pointer returned from alloc_pages().
+ * @order: The order of the allocation.
+ *
+ * This function can free multi-page allocations that are not compound
+ * pages. It does not check that the @order passed in matches that of
+ * the allocation, so it is easy to leak memory. Freeing more memory
+ * than was allocated will probably emit a warning.
+ *
+ * If the last reference to this page is speculative, it will be released
+ * by put_page() which only frees the first page of a non-compound
+ * allocation. To prevent the remaining pages from being leaked, we free
+ * the subsequent pages here. If you want to use the page's reference
+ * count to decide when to free the allocation, you should allocate a
+ * compound page, and use put_page() instead of __free_pages().
+ *
+ * Context: May be called in interrupt context or while holding a normal
+ * spinlock, but not in NMI context or while holding a raw spinlock.
+ */
void __free_pages(struct page *page, unsigned int order)
{
if (put_page_testzero(page))
