lib/test_free_pages.c: add basic progress indicators

The test module to check that free_pages() does not leak memory does not
provide any feedback whatsoever its state or progress, but may take some
time on slow machines.  Add the printing of messages upon starting each
phase of the test, and upon completion.

Link: https://lkml.kernel.org/r/20201018140445.20972-1-geert@linux-m68k.orgSigned-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Mike Rapoport <rppt@kernel.org>
Cc: Matthew Wilcox <willy@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

lib/test_free_pages.c

@@ -5,6 +5,8 @@
  * Author: Matthew Wilcox <willy@infradead.org>
  */
 
+#define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
+
 #include <linux/gfp.h>
 #include <linux/mm.h>
 #include <linux/module.h>
@@ -26,8 +28,11 @@ static void test_free_pages(gfp_t gfp)
 
 static int m_in(void)
 {
+	pr_info("Testing with GFP_KERNEL\n");
 	test_free_pages(GFP_KERNEL);
+	pr_info("Testing with GFP_KERNEL | __GFP_COMP\n");
 	test_free_pages(GFP_KERNEL | __GFP_COMP);
+	pr_info("Test completed\n");
 
 	return 0;
 }