locking/rwsem: Fix warnings for CONFIG_RWSEM_GENERIC_SPINLOCK

Optimistic spinning is only used by the xadd variant
of rw-semaphores. Make sure that we use the old version
of the __RWSEM_INITIALIZER macro for systems that rely
on the spinlock one, otherwise warnings can be triggered,
such as the following reported on an arm box:

  ipc/ipcns_notifier.c:22:8: warning: excess elements in struct initializer [enabled by default]
  ipc/ipcns_notifier.c:22:8: warning: (near initialization for 'ipcns_chain.rwsem') [enabled by default]
  ipc/ipcns_notifier.c:22:8: warning: excess elements in struct initializer [enabled by default]
  ipc/ipcns_notifier.c:22:8: warning: (near initialization for 'ipcns_chain.rwsem') [enabled by default]

Signed-off-by: Davidlohr Bueso <davidlohr@hp.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Tim Chen <tim.c.chen@linux.intel.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
Cc: Michel Lespinasse <walken@google.com>
Cc: Peter Hurley <peter@hurleysoftware.com>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Jason Low <jason.low2@hp.com>
Cc: Andi Kleen <andi@firstfloor.org>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <jbacik@fusionio.com>
Link: http://lkml.kernel.org/r/1400545677.6399.10.camel@buesod1.americas.hpqcorp.net
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/include/linux/rwsem.h b/include/linux/rwsem.h
index 3e108f154cb66917ff3b6dd704827d3bc4f9133d..8d79708146aa47d642d37e82ca3beea2eaa7c014 100644 (file)
--- a/include/linux/rwsem.h
+++ b/include/linux/rwsem.h
@@ -64,7 +64,7 @@ static inline int rwsem_is_locked(struct rw_semaphore *sem)
 # define __RWSEM_DEP_MAP_INIT(lockname)
 #endif
 
-#ifdef CONFIG_SMP
+#if defined(CONFIG_SMP) && !defined(CONFIG_RWSEM_GENERIC_SPINLOCK)
 #define __RWSEM_INITIALIZER(name)                      \
        { RWSEM_UNLOCKED_VALUE,                         \
          __RAW_SPIN_LOCK_UNLOCKED(name.wait_lock),     \