include/asm-generic/kmap_types.h: add helpful reminder

Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

include/asm-generic/kmap_types.h

@@ -29,6 +29,9 @@ KMAP_D(16)	KM_IRQ_PTE,
 KMAP_D(17)	KM_NMI,
 KMAP_D(18)	KM_NMI_PTE,
 KMAP_D(19)	KM_KDB,
+/*
+ * Remember to update debug_kmap_atomic() when adding new kmap types!
+ */
 KMAP_D(20)	KM_TYPE_NR
 };