locking/atomic, kref: Add KREF_INIT()

Since we need to change the implementation, stop exposing internals.

Provide KREF_INIT() to allow static initialization of struct kref.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: linux-kernel@vger.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

5 files changed, 6 insertions, 8 deletions

diff --git a/drivers/block/drbd/drbd_bitmap.c b/drivers/block/drbd/drbd_bitmap.c
index ab62b81c2ca7..dece26f119d4 100644
--- a/drivers/block/drbd/drbd_bitmap.c
+++ b/drivers/block/drbd/drbd_bitmap.c
@@ -1070,7 +1070,7 @@ static int bm_rw(struct drbd_device *device, const unsigned int flags, unsigned
                 .done = 0,
                 .flags = flags,
                 .error = 0,
-                .kref = { ATOMIC_INIT(2) },
+                .kref = KREF_INIT(2),
         };
 
         if (!get_ldev_if_state(device, D_ATTACHING)) {  /* put is in drbd_bm_aio_ctx_destroy() */
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 91307940c8ac..052f8d3c41cb 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -256,7 +256,7 @@ struct fuse_io_priv {
 
 #define FUSE_IO_PRIV_SYNC(f) \
 {                                       \
-        .refcnt = { ATOMIC_INIT(1) },   \
+        .refcnt = KREF_INIT(1),         \
         .async = 0,                     \
         .file = f,                      \
 }
diff --git a/include/linux/kref.h b/include/linux/kref.h
index e15828fd71f1..9af255ad1e2f 100644
--- a/include/linux/kref.h
+++ b/include/linux/kref.h
@@ -24,6 +24,8 @@ struct kref {
         atomic_t refcount;
 };
 
+#define KREF_INIT(n)    { .refcount = ATOMIC_INIT(n), }
+
 /**
  * kref_init - initialize object.
  * @kref: object in question.
diff --git a/init/version.c b/init/version.c
index fe41a63efed6..5606341e9efd 100644
--- a/init/version.c
+++ b/init/version.c
@@ -23,9 +23,7 @@ int version_string(LINUX_VERSION_CODE);
 #endif
 
 struct uts_namespace init_uts_ns = {
-        .kref = {
-                .refcount       = ATOMIC_INIT(2),
-        },
+        .kref = KREF_INIT(2),
         .name = {
                 .sysname        = UTS_SYSNAME,
                 .nodename       = UTS_NODENAME,
diff --git a/kernel/pid.c b/kernel/pid.c
index f66162f2359b..0291804151b5 100644
--- a/kernel/pid.c
+++ b/kernel/pid.c
@@ -68,9 +68,7 @@ static inline int mk_pid(struct pid_namespace *pid_ns,
  * the scheme scales to up to 4 million PIDs, runtime.
  */
 struct pid_namespace init_pid_ns = {
-        .kref = {
-                .refcount       = ATOMIC_INIT(2),
-        },
+        .kref = KREF_INIT(2),
         .pidmap = {
                 [ 0 ... PIDMAP_ENTRIES-1] = { ATOMIC_INIT(BITS_PER_PAGE), NULL }
         },