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authorAlexey Dobriyan <adobriyan@gmail.com>2009-09-23 22:57:32 (GMT)
committerLinus Torvalds <torvalds@linux-foundation.org>2009-09-24 14:21:05 (GMT)
commit858f09930b32c11b40fd0c5c467982ba09b10894 (patch)
tree43972de84d69d61904f4f24ff78f99a3a82c2ff3
parentb873c2f34ecd4a5a69b41b852cbc365694541c5f (diff)
downloadlinux-858f09930b32c11b40fd0c5c467982ba09b10894.tar.xz
aio: ifdef fields in mm_struct
->ioctx_lock and ->ioctx_list are used only under CONFIG_AIO. Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Cc: Zach Brown <zach.brown@oracle.com> Cc: Benjamin LaHaise <bcrl@kvack.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mm_types.h5
-rw-r--r--kernel/fork.c11
2 files changed, 11 insertions, 5 deletions
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 0042090..6b7029a 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -259,11 +259,10 @@ 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 b51fd2c..e49f181 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -434,6 +434,14 @@ __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);
@@ -447,10 +455,9 @@ 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))) {