mm: page_alloc: catch out-of-date list of page flag names

String tables with names of enum items are always prone to go out of
sync with the enums themselves.  Ensure during compile time that the
name table of page flags has the same size as the page flags enum.

Signed-off-by: Johannes Weiner <hannes@cmpxchg.org>
Cc: Gavin Shan <shangw@linux.vnet.ibm.com>
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 72869ea5c51387fc2594a05a5b78d17be89d7d4a..5712898c951b34add6816cbf5c1a71fba00f3c6c 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -5985,6 +5985,8 @@ static void dump_page_flags(unsigned long flags)
        unsigned long mask;
        int i;
 
+       BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) - 1 != __NR_PAGEFLAGS);
+
        printk(KERN_ALERT "page flags: %#lx(", flags);
 
        /* remove zone id */