mm: print out memmap number only if it is not zero

Don't print the size of the zone's memmap array if it does not have one.

Impact: cleanup

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d8ac01474563954fed58a1f87e2249c99827c430..2f644c3e3da378baf0f186cb406e717b20ad4932 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -3469,9 +3469,10 @@ static void __paginginit free_area_init_core(struct pglist_data *pgdat,
                        PAGE_ALIGN(size * sizeof(struct page)) >> PAGE_SHIFT;
                if (realsize >= memmap_pages) {
                        realsize -= memmap_pages;
-                       printk(KERN_DEBUG
-                               "  %s zone: %lu pages used for memmap\n",
-                               zone_names[j], memmap_pages);
+                       if (memmap_pages)
+                               printk(KERN_DEBUG
+                                      "  %s zone: %lu pages used for memmap\n",
+                                      zone_names[j], memmap_pages);
                } else
                        printk(KERN_WARNING
                                "  %s zone: %lu pages exceeds realsize %lu\n",