From: Yu Zhao <yuzhao@xxxxxxxxxx> Subject: include/linux/compaction.h: fix potential build error Declaration of struct node is required regardless. On UMA systems, including compaction.h without preceding node.h shouldn't cause a build error. Link: http://lkml.kernel.org/r/20190208080437.253322-1-yuzhao@xxxxxxxxxx Signed-off-by: Yu Zhao <yuzhao@xxxxxxxxxx> Reviewed-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> Acked-by: Michal Hocko <mhocko@xxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/compaction.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/include/linux/compaction.h~mm-fix-potential-build-error-in-compactionh +++ a/include/linux/compaction.h @@ -226,8 +226,8 @@ static inline void wakeup_kcompactd(pg_d #endif /* CONFIG_COMPACTION */ -#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) struct node; +#if defined(CONFIG_COMPACTION) && defined(CONFIG_SYSFS) && defined(CONFIG_NUMA) extern int compaction_register_node(struct node *node); extern void compaction_unregister_node(struct node *node); _
