A pointer into virtual memory is represented by a (void *) not an u32, so the compiler warns: lib/test_free_pages.c:20:50: warning: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion] Fix this with an explicit cast. Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Cc: linux-mm@xxxxxxxxx Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx> --- lib/test_free_pages.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/lib/test_free_pages.c b/lib/test_free_pages.c index 25ae1ac2624a..9ebf6f5549f3 100644 --- a/lib/test_free_pages.c +++ b/lib/test_free_pages.c @@ -17,7 +17,7 @@ static void test_free_pages(gfp_t gfp) for (i = 0; i < 1000 * 1000; i++) { unsigned long addr = __get_free_pages(gfp, 3); - struct page *page = virt_to_page(addr); + struct page *page = virt_to_page((void *)addr); /* Simulate page cache getting a speculative reference */ get_page(page); -- 2.36.1