On 2/3/20 5:58 AM, Kirill A. Shutemov wrote:
...

quoted

@@ -19,6 +21,48 @@ struct gup_benchmark {
 	__u64 expansion[10];	/* For future use */
 };
 
+static void put_back_pages(unsigned int cmd, struct page **pages,
+			   unsigned long nr_pages)
+{
+	int i;
+
+	switch (cmd) {
+	case GUP_FAST_BENCHMARK:
+	case GUP_LONGTERM_BENCHMARK:
+	case GUP_BENCHMARK:
+		for (i = 0; i < nr_pages; i++)

'i' is 'int' and 'nr_pages' is 'unsigned long'.
There's space for trouble :P

Yes, I've changed it to "unsigned int", thanks.

quoted

+			put_page(pages[i]);
+		break;
+
+	case PIN_FAST_BENCHMARK:
+	case PIN_BENCHMARK:
+		unpin_user_pages(pages, nr_pages);
+		break;
+	}
+}
+
+static void verify_dma_pinned(unsigned int cmd, struct page **pages,
+			      unsigned long nr_pages)
+{
+	int i;
+	struct page *page;
+
+	switch (cmd) {
+	case PIN_FAST_BENCHMARK:
+	case PIN_BENCHMARK:
+		for (i = 0; i < nr_pages; i++) {

Ditto.

Fixed here also.

quoted

+			page = pages[i];
+			if (WARN(!page_maybe_dma_pinned(page),
+				 "pages[%d] is NOT dma-pinned\n", i)) {

...and changed to "pages[%u]", to match.


thanks,
-- 
John Hubbard
NVIDIA

quoted

+
+				dump_page(page, "gup_benchmark failure");
+				break;
+			}
+		}
+		break;
+	}
+}
+
 static int __gup_benchmark_ioctl(unsigned int cmd,
 		struct gup_benchmark *gup)
 {