[PATCH] ifdef AIO stuff in mm_struct

[Alexey Dobriyan <adobriyan@gmail.com>]

->ioctx_lock and ->ioctx_list are used only under CONFIG_AIO.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
 include/linux/mm_types.h |    5 ++---
 kernel/fork.c            |   11 +++++++++--
 2 files changed, 11 insertions(+), 5 deletions(-)

diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 7acc843..f69ced6 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -261,11 +261,10 @@ struct mm_struct {
 	unsigned long flags; /* Must use atomic bitops to access the bits */
 
 	struct core_state *core_state; /* coredumping support */
-
-	/* aio bits */
+#ifdef CONFIG_AIO
 	spinlock_t		ioctx_lock;
 	struct hlist_head	ioctx_list;
-
+#endif
 #ifdef CONFIG_MM_OWNER
 	/*
 	 * "owner" points to a task that is regarded as the canonical
diff --git a/kernel/fork.c b/kernel/fork.c
index 467746b..8d3e47f 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -420,6 +420,14 @@ __setup("coredump_filter=", coredump_filter_setup);
 
 #include <linux/init_task.h>
 
+static void mm_init_aio(struct mm_struct *mm)
+{
+#ifdef CONFIG_AIO
+	spin_lock_init(&mm->ioctx_lock);
+	INIT_HLIST_HEAD(&mm->ioctx_list);
+#endif
+}
+
 static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
 {
 	atomic_set(&mm->mm_users, 1);
@@ -432,10 +440,9 @@ static struct mm_struct * mm_init(struct mm_struct * mm, struct task_struct *p)
 	set_mm_counter(mm, file_rss, 0);
 	set_mm_counter(mm, anon_rss, 0);
 	spin_lock_init(&mm->page_table_lock);
-	spin_lock_init(&mm->ioctx_lock);
-	INIT_HLIST_HEAD(&mm->ioctx_list);
 	mm->free_area_cache = TASK_UNMAPPED_BASE;
 	mm->cached_hole_size = ~0UL;
+	mm_init_aio(mm);
 	mm_init_owner(mm, p);
 
 	if (likely(!mm_alloc_pgd(mm))) {

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