From: Alexey Dobriyan <adobriyan@xxxxxxxxx> Subject: include/linux/mm_types.h: ifdef struct vm_area_struct::swap_readahead_info The field is only used in swap code. Link: http://lkml.kernel.org/r/20190503190500.GA30589@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/mm_types.h | 2 ++ 1 file changed, 2 insertions(+) --- a/include/linux/mm_types.h~swap-ifdef-struct-vm_area_struct-swap_readahead_info +++ a/include/linux/mm_types.h @@ -329,7 +329,9 @@ struct vm_area_struct { struct file * vm_file; /* File we map to (can be NULL). */ void * vm_private_data; /* was vm_pte (shared mem) */ +#ifdef CONFIG_SWAP atomic_long_t swap_readahead_info; +#endif #ifndef CONFIG_MMU struct vm_region *vm_region; /* NOMMU mapping region */ #endif _
