mmu_notifier: Reduce size of mm_struct if !CONFIG_MMU_NOTIFIER Use an #ifdef to make the mmu_notifer_head structure empty if we have no notifier. That allows the use of the structure in inline functions (which allows parameter verification even if !CONFIG_MMU_NOTIFIER) Signed-off-by: Christoph Lameter --- include/linux/mm_types.h | 2 ++ 1 file changed, 2 insertions(+) Index: linux-2.6/include/linux/mm_types.h =================================================================== --- linux-2.6.orig/include/linux/mm_types.h 2008-01-31 14:03:23.000000000 -0800 +++ linux-2.6/include/linux/mm_types.h 2008-01-31 14:03:38.000000000 -0800 @@ -154,7 +154,9 @@ struct vm_area_struct { }; struct mmu_notifier_head { +#ifdef CONFIG_MMU_NOTIFIER struct hlist_head head; +#endif }; struct mm_struct {